OISD-RP-147 PDF - Inspection and Safe Practices During Installation of Electrical Equipment (2022)

OIL INDUSTRY SAFETY DIRECTORATE विद्युत उपकरणों की स्थापना के दौरान वनरीक्षण और सुरवक्षत प्रथाएं ओ आई एस डी – आर पी - 147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION OF ELECTRICAL EQUIPMENT OISD – RP - 147 Inception October 1993 Amended Edition October 2002 Revised Edition **** 2022 FOR RESTRICTED CIRULATION ONLY OIL INDUSTRY SAFETY DIRECTORATE Government of India Ministry of Petroleum & Natural Gas 8th Floor, OIDB Bhavan, Plot No. 2, Sector – 73, Noida – 201301 (U.P.) Website: https://www.oisd.gov.in Tele: 0120-2593833 Page No. I 2nd FUNCTIONAL COMMITTEE ON INSPECTION AND SAFE PRACTICES DURING INSTALLATION OF ELECTRICAL EQUIPMENT (XXX 2022) LIST OF MEMBERS ………………………………………………………………………………………………………………… Name Organisation …………………………………………………………………………………………………………………. Leader Amit Kumar ONGC Members Bharatendu Nayak HPCL Rajesh Kumar C MRPL Dipak Kumar Das OIL Yatheendran M.R. BPCL Atul K Joshi IOCL S. K. Sahu IOCL Shiv Shanker Verma GAIL Bipin Kumar Pathak ONGC Annaiah. D R BPCL Amit V. Nimdeo HPCL Rajib Kumar Sarmah OIL (India) Mayur Budh Nayara Energy Nawroz Khan RIL Parmod Kumar (Till 16.07.21) OISD Member Coordinator Kailash C Kushwaha Oil Industry Safety Directorate ………………………………………………………………………………………………………………….. In addition to above, several other experts from industry contributed in the preparation, review and finalization of this document. 1st FUNCTIONAL COMMITTEE ON Inspection and maintenance of electrical equipment (Oct 1993) LIST OF MEMBERS ………………………………………………………………………………………………………………… Name Organisation …………………………………………………………………………………………………………………. Leader B.B. Chakravorthy IOCL Members A.K. Anchan HPCL M.J. Bordoloi OIL A.P. Kant BRPL George P. Paret CRL R. Sankaran MRL S.C. Upadhyaya ONGC R. Srinivasan BPCL Member Co-ordinator N.V. Mani Oil industry Safety Directorate --------------------------------------------------------------------------------------------------------------------------------- In addition to the above, several other experts from Industry contributed in the preparation, review and finalisation of this document. Page No. III INSPECTION AND SAFE PRACTICES DURING INSTALLATION OF ELECTRICAL EQUIPMENT CONTENTS --------------------------------------------------------------------------------------------------------------------- ------------ SECTION DESCRIPTION PAGE NO. --------------------------------------------------------------------------------------------------------------------------------- 1.0 INTRODUCTION 1 2.0 SCOPE 1 3.0 DEFINITIONS 1 4.0 SPECIAL REQUIREMENTS 3 5.0 STAGEWISE INSPECTION 5 5.1 GENERATOR 5 5.2 MOTOR 7 5.3 TRANSFORMER 8 5.4 SWITCHGEAR 10 5.5 OUTDOOR SWITCHYARD EQUIPMENT 12 5.6 BATTERY 15 5.7 LIGHTING EQUIPMENT & ACCESSORIES 16 5.8 CABLE 17 5.9 EARTHING GRID 19 5.10 HEAT TRACING 20 5.11 CAPACITOR BANK 21 6.0 EQUIPMENT IN HAZARDOUS AREA 21 7.0 TEMPORARY ELECTRICAL INSTALLATION 22 8.0 DOCUMENTATION 23 9.0 MISCELLANEOUS 23 10.0 REFERENCES 24 11.0 ABBREVIATION 25 ANNEXURE-I 26 TYPICAL SECTION OF CABLE TRENCH MAJOR CHANGES IN REVISED EDITION 27 OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 1 OF ELECTRICAL EQUIPMENT INSPECTION AND SAFE PRACTICES DURING INSTALLATION OF ELECTRICAL EQUIPMENT 1. INTRODUCTION Safety in electrical system deserves maximum attention especially in the hydrocarbon industry, where classified hazardous atmosphere is normally encountered, and electricity constitutes one of the major sources of ignition (by arcs, sparks and hot surfaces) for fire accidents and explosions etc. Besides equipment damage and property loss, electrical hazards also include injuries and fatalities to personnel due to electric shock and burns. Institution of quality assurance programmes during the erection stage itself ensures that good quality of material, superior workmanship under competent supervision and compliance with standard engineering practices have gone into the work. This is rightly termed "Safety in-built into the System" Timely inspection and adhering to safe practices as per the guidelines given in this document will facilitate safer operations of the electrical installation for a longer period of time, in the hydrocarbon Industry. 2. SCOPE This document specifies the minimum inspection requirements and safe practices to be adhered to, in the case of new electrical installation during their erection stage itself/ re-installation of electrical equipment after overhauling. This document covers stage-wise inspection of electrical equipment and installation practices in onshore locations of hydrocarbon industry. Pre- commissioning requirements are excluded from scope, for which OISD-STD-137 shall be referred. 3. DEFINITIONS 3.1 Hazardous (Flammable) atmosphere An atmosphere containing any flammable gas or vapour in a concentration capable of ignition. 3.2 Explosive Gas atmosphere Mixture with air under atmospheric conditions of flammable substances in the form of gas or vapour which after ignition permits self-sustaining flame propagation. 3.3 Flash Point The temperature at which the liquid gives so much vapour that this vapour, when mixed with air, forms an ignitable mixture and gives a momentary flash on application of a small pilot flame under specified condition of test. 3.4 Hazardous area Area in which an explosive gas atmosphere is present or may be expected to be present, in quantities such as to require special precautions for the construction, installation and use of equipment. An area shall be deemed to be hazardous area, where: “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 2 OF ELECTRICAL EQUIPMENT a. Petroleum having flash point below 65 0C or any flammable gas or vapour in a concentration capable of ignition is likely to be present. b. Petroleum or any flammable liquid having flash point 65 0C is likely to be refined, blended, handled or stored at or above its flash point. 3.5 ZONES Hazardous areas are classified into zones based upon the frequency of the occurrence and duration of an explosive gas atmosphere. Zone 0 Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is present continuously or for long periods or frequently. Zone 1 Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is likely to occur in normal operation occasionally. Zone 2 Place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapour or mist is not likely to occur in normal operation but if it does occur, will persist for short period only. 3.6 Non-Hazardous Area Area in which an explosive gas atmosphere is not expected to be present in quantities such as to require special precautions for the construction, installation, and use of equipment. 3.7 Grouping of Flameproof Enclosures (Apparatus Groups) Flameproof enclosures shall be classified into two groups as follows: a. Group- I Equipment intended for use in mines & b. Group-II Equipment intended for use in places with an explosive gas atmosphere other than mines. Enclosures in Group II shall be further subdivided into IIA, IIB, IIC according to the requirements appropriate to the nature of the flammable atmosphere for which the apparatus is intended. (For maximum gaps, and diametrical clearances for each group and sub-group of enclosures, IS/ IEC 60079-1 shall be referred). 3.8 Temperature Classes (T-group) A system of classification by which an electrical apparatus is allocated temperature classes according to its maximum surface temperature. Permitted maximum surface temperatures of apparatuses, are classified under following six groups viz: Temperature Maximum Surface Class Temp. (0C) T1 450 “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 3 OF ELECTRICAL EQUIPMENT T2 300 T3 200 T4 135 T5 100 T6 85 (For details IS/IEC 60079-0:2004 shall be referred). 3.9 Flameproof (or Explosion proof) Enclosure Type of protection in which the parts, which can ignite an explosive atmosphere, are placed in an enclosure which can withstand the pressure developed during an internal explosion of an explosive mixture and which prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure. (For details IS/ IEC 60079-1 shall be referred) 3.10 Intrinsic Safety A circuit or part of a circuit is intrinsically safe when any spark or thermal effect produced normally (that is, by breaking or closing the circuit) or accidentally (for example, by short circuit or earth fault) is incapable, under prescribed test conditions, of causing ignition of a prescribed gas or vapour. An intrinsically safe apparatus is one in which all electrical circuits are intrinsically safe. (For details, IS/ IEC 60079-11: 2006 shall be referred) 3.11 Increased Safety Type of protection applied to electrical equipment in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions. 3.12 Adequate Ventilation Adequate ventilation is that which is sufficient to prevent accumulations of significant quantities of gas-air mixtures in concentration over one-fourth of the lower explosive limit. Adequately ventilated area could be naturally ventilated or artificially ventilated. 3.13 Ignition Temperature The lowest temperature at which ignition occurs in a mixture of explosive gas and air when the method of testing ignition temperatures specified in relevant Indian Standard is followed. For other terms such as "Authorised Person", "Engineer-in-Charge” etc. OISD-STD-137 shall be referred. 4. SPECIAL REQUIREMENTS All latest statutory stipulations such as CEA (Measures relating to safety and electric supply) Regulations and its amendments, framed under Indian Electricity Act 2003, Petroleum Act & Rules as applicable etc., shall be complied with, and related OEM manual should be referred for “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 4 OF ELECTRICAL EQUIPMENT the recommended standard practices for inspection, safety and precautions while carrying out electrical installation, their inspection, testing and commissioning. Before commencement of electrical installation, it should be checked that equipment and other materials are received as per approved specification as ordered. Damaged item and/ or missing component should get repaired/ replaced as per specification. During erection, all the accessories and loose item shall also be inspected before their assembly/ mounting. Some of the salient aspects listed below shall also be taken care: a. Before energising/ commissioning of electrical installations, the scheme, equipment installation layout and Single Line Diagram (SLD) shall get approved from the statutory authorities as applicable. All observations, pointed out during inspection shall be complied and submitted to statutory authority. b. It shall be ensured that the manufacturer of electrical equipment (switchgear, panels etc.) incorporates all statutory provisions. The vendor drawings shall be approved for fabrication only after ascertaining this aspect. c. Hazardous area classification drawing shall be studied, and selection of electrical equipment shall be in accordance with Petroleum and Explosive Safety Organization (PESO)/ DGMS stipulations. All the indigenous flameproof equipment/ accessories shall have test certificate from PESO approved laboratory. In case of imported equipment, even if it is tested and certified from the country of origin, approval should be taken from PESO/ DGMS for using them in hazardous area. No unauthorised repair, modification shall be carried out in the flameproof items (Terminal box, Junction box etc.). IS/ IEC 60079-17 to be referred for inspection and maintenance requirement and IS/ IEC 60079-19 to be referred for repair, overhaul and reclamation. Preferably damaged enclosures of flameproof equipment should be replaced with new ones instead of repairing. d. The fire insurance requirement shall be incorporated in the system. e. Before taking up any electrical equipment for commissioning, it should be ensured that the entire installation and wiring connection etc. are carried out as per approved drawings. f. Selection of contractor/ electrical supervisor/ wiremen etc. shall be carefully done. Only licensed and competent agencies (approved by the Central/ State Government licensing agency) shall be employed. g. Full time supervision shall be ensured. The completion certificate and test certificate shall be issued by the contractor with signature of full-time supervision supervisor, directly under the employment of contractor. h. No temporary electrical connection shall be provided by non-electrical staff. During the use of such temporary facilities, there shall be licensed electrical supervisor/ electrician for safe operation/ maintenance. The electrical works, even for temporary use, shall be carried out under the supervision of licensed electrician/ electrical contractor. i. Any addition of load or modification in the wiring, scheme, layout etc. shall be incorporated in the as-built drawing and major alteration shall get approved from the Electrical Inspectorate/ Director General of Mines Safety (DGMS) as applicable, prior to energisation of installations. j. Captive power generation (even installation of Diesel Generator) shall require prior sanction of the Electricity Supply Authorities (as per the provisions of Act). k. There shall be approved electrical work permit system and list of authorised personnel. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 5 OF ELECTRICAL EQUIPMENT l. The compliance of observations/ requirements noted during the inspection of statutory authorities/ OISD shall be adhered to. m. Pre-commissioning checks as recommended in OISD-STD-137 should be carried out before any electrical equipment is taken up for commissioning. n. Electrical accidents shall be notified to the Electrical Inspectorate (as per CEA regulations)/ DGMS and State Government authorities. The recommendations of the statutory bodies as a result of investigation, shall be complied with as required. o. The installation’s facilities and procedures etc. shall be updated in line with changing regulations from time to time. p. In case the area classification (due to process modification/expansion etc.) gets revised, the electrical installations should be reviewed whether they conform to revised classification. (For example, earlier classified as zone 2, with "increased safety" or "non-sparking type" fixtures have to be changed to 'Flameproof' type once the area gets revised to zone 1). q. Even after getting approval from statutory bodies, the equipment should not be energised without checking the interlocks as provided. Interlocks should not be defeated once ready for energisation under any circumstances. r. During installation all safety operating systems, as provided in the design, are available and ensured. s. During installation, special precautions, related to laying and termination of power/ control/ communication cables and such other requirement, shall be adhered to. t. Before insulation test all related earth connections to be removed. u. It is to be ensured that all factory test certificates are available which will be kept as baseline data for future references. v. Check the firefighting/ fire protection system is in line & in order. 5. STAGEWISE INSPECTION 5.1 GENERATOR The following shall be checked/ ensured: a. Name plate and suitability to the specified area classification. Manufacturers’ erection/ commissioning/ operation and maintenance manuals are available. b. Approach way to access generator foundation is clear. c. The crane is checked and confirmed for lifting capacity along with load test certificate of sling & other lifting tools & tackles. d. All lifting tools and tackles are properly sized and tested. e. Only lifting lugs designated for this purpose, on the Generator, are used for lifting. f. Generator manufacturer’s recommendations for erection, are followed. g. After placing generator on foundation, the following are recorded: i. Insulation Resistance (IR) & Polarisation Index (PI) values of stator and rotor & excitation system. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 6 OF ELECTRICAL EQUIPMENT ii. Resistance and temperature of stator and rotor windings. (Compare with test values recorded at manufacturer's work after making correction for temperature) h. Bearing clearance is in order. i. Alignment of generator rotor and turbine rotor/ prime mover is done as per manufacturer's recommendation and readings are recorded. j. Insulating shims have been provided below generator and exciter bearing against flow of shaft currents, before aligning rotor, as applicable. k. Bearing housing is dowelled to pedestal after alignment. l. By lifting generator rotor, IR value of rotor shaft with respect to earth is confirmed as per manufacturers’ recommendations. m. Generator air gap at both driving and non-driving end are maintained as per manufacturer's recommendations. However, deviation from average shall not be more than + 5%. n. Stator frame is dowelled to base frame after final air gap check. o. All couplings viz. between generator and turbine/ prime mover, generator and exciter are in good condition. p. Generator cooling piping/ ducting are in good condition. q. The coolers are pressure tested before taking them in line, in case of water-cooling (Test pressure shall be 1.5 times the normal working pressure). r. Lubricating oil-piping system is in good condition. The flanges and bolts on lube oil line at the bearing ends are properly insulated to prevent flow of shaft current. s. Generator stator and rotor cable connections are intact. Phase sequence of generator output connections are correct. Bimetallic washers (if different metals are in contact) are in good condition. t. Space heater winding and resistance temperature detector connections (RTDS) are correct. u. Lube oil temperature indicators are in working order. v. Neutral connections on stator are intact. w. Neutral grounding resistor of transformer/ reactor and its value conform to specifications. Double and distinct earthing with proper earth conductor size is provided as per IS: 3043 and earth resistance is within specified limit. x. Generator stator body earthing and rotor shaft earthing (if any) are to be checked. y. Earthing bonds on generator body and terminal boxes (power and neutral side) are made. z. Neutral grounding earth pit is installed & connected, and value of earth resistance is recorded. aa. If there is a link switch in generator neutral, it is properly interlocked with main generator synchronising breaker. bb. All bus ducts and cable entries are checked for proper sealing. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 7 OF ELECTRICAL EQUIPMENT cc. All slip rings and brushes are in order (if provided). dd. Carbon brush contact pressure is set to recommended value (if provided). ee. All temperature and pressure gauges are tested. ff. All auxiliaries of generator like lube oil pump, pilot exciter, rotating diodes (if brushless type), condensate pump, demisters, starter system of prime mover etc. are in order. gg. Synchronizing circuit & panel, AVR panel and main breaker are in good condition. hh. All PTs and CTs and other connections and polarity are in order. ii. All protective devices are functioning properly and that the inter-tripping/ alarms are in order (by simulation). jj. All interlocks (by simulation) are functioning properly. kk. All metering devices are in good condition. ll. Direction of rotation of barring motor (turning gear/ ratchet) is correct. mm. Following is confirmed to be correct: (if not, corrective actions to be taken). i. Air gap. ii. Field winding connections. iii. Compound winding connections. iv. Brush pressure to recommended values. v. Grease lubrication for bearings, replace bearing packing grease with running grease of antifriction bearings. If journal bearings are used check clearances. vi. Provision of coupling guard(s), if any. 5.2 MOTOR The following shall be checked/ ensured: a. Name plate details of motor and suitability to the specified area classification. b. The insulation resistance between phase and earth and between phases (wherever provisions exist) of motor is measured before and after connection of the power cables. Winding resistances & inductance values should also be recorded. c. No unauthorised site modification for flameproof equipment is done. d. Double and distinct earthing with proper earth conductor size is provided as per IS: 3043 and earth resistance is within specified limit. e. When pump and motor are not in the same base plate, both are independently earthed. f. Foundation bolts are of proper size. g. Correct type and size of cable gland is used, and correct method of cable termination is adopted. Gland of motor in classified area shall be of double compression flameproof type. h. Cooling system has been installed in accordance with approved drawings. i. Space heater and its terminations are in order. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 8 OF ELECTRICAL EQUIPMENT j. The tag numbers of motor and pump are correct. k. Remote OFF and Local ON/OFF facility are available and tested prior to trial run of motor. Wherever remote start is envisaged, one no. Local/ Remote start selector switch (lockable type) shall be installed to facilitate remote start when switch is in remote start position. l. All auxiliary equipment like lube oil pump, cooling water for bearing, purging/ pressurization system (wherever applicable) are available in good condition. m. Provision of canopy, wherever required. n. Facility for removing motor from foundation (for maintenance) is available. o. Freeness of shaft and bearing. p. Refer motor manual for special checks and its compliances. q. Air gap is within allowable tolerances. r. Measure the insulation resistance at the end of 30 seconds and 60 seconds and calculate the Dielectric Absorption Ratio of motor windings for motor rated above 600V. This should be of acceptable value as per relevant standards. s. Calculate Polarisation Index of windings for critical HT motors by taking insulation resistance at the end of 1 minute and 10 minutes. The acceptable values of Polarisation Index vary according to the class of insulation. (for acceptable values refer relevant standards) t. The direction of rotation is correct. u. All the terminal boxes are tight with proper gasket and fasteners. v. Coupling guard has been provided. w. Mechanical and electrical checks as per IS 900 are carried out. x. Ventilation and cooling system. y. Condition of bearing grease/ oil. 5.3 TRANSFORMER The following shall be checked/ ensured: a. The name plate details conform with specification. b. All the accessories have been fixed properly. c. Proper earthing as per IS:3043 & IS:10028 is provided for the transformer body and neutral. d. Dielectric strength and acidity of the oil, taking three samples (minimum), (if required, filter the oil). e. Safety precautions during oil filling, as listed below should be followed: i. Oil shall be of approved quality. ii. Each oil drum must have the distinct test certificate for dielectric strength/ water content and acidity. After transformer oil filling and cooling for at least 24 hrs, its sample should be collected and be tested for its dielectric strength/ water content and Dissolved Gas Analysis (DGA). “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 9 OF ELECTRICAL EQUIPMENT iii. Oil should be filled through streamline filter from the bottom of transformer tank. Use of metal hoses/ pipes is recommended for filling transformer oil (in case of rubber hoses, sulphur from hoses may get mixed with transformer oil reducing dielectric). iv. Filling rate should be gradual at moderate rates. v. Tank body and oil filling machine shall be securely earthed. vi. All vents are kept open, while filling, and to be closed after oil starts coming out. vii. Silicate breather to be taken into line after the transformer and conservator is filled with oil. viii. Level is brought down to the normal level and commission the breather. f. Oil filtering and conditioning is to be done as per IS:10028. g. The oil level in the transformer conservator tank and all the bushings is up to the marked point. h. There is no oil leakage. Oil collection pit has been made as per OISD-STD-173. i. The Desiccant material like silica gel pouches/ bags is in reactivated condition. j. The breather pipe is clear from any blocking and contains oil up to the marked level. k. The explosion vent diaphragm does not have any dents, accumulation of any oil, and air has been released. l. The Buchholz relay is mounted correctly. There is no friction in the movement, and the floats are free. There should not be air bubbles inside Buchholz relay. m. All the manufacture's test certificates are available, as required. n. Phase sequence and connections for vector group are correct. o. The gap of arcing horns for the bushings is provided correctly and earthing connections for the surge diverters have been made. p. The windings and oil temperature thermometer pockets contain oil and display meters are tested and calibrated. q. Provision of copper strip bonding between: i. Top cover and transformer tank. ii. Bushing flange and transformer body. iii. Terminal box cover and transformer tank body. r. The operation of the "OFF LOAD" and "ON LOAD" tap changers on all the tap positions are satisfactory and the brake shoes of tap change motor are in order. s. The tap position indicated on the transformer and that on the control panel are the same. t. The oil level of tap changer tank is correct, and oil has been tested for dielectric strength. u. The insulation resistance of control circuit wiring, transformer windings, and all the incoming and outgoing cables have been checked and found in good condition. v. The valve in the cooling system and valve between the Buchholz relay and the conservator tank are in open position. w. Cooling system including radiators, automatic starting and stopping of fans etc. is functioning properly. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 10 OF ELECTRICAL EQUIPMENT x. Transformer bushings surface are clean. y. All the tools and other materials have been removed from the transformer vicinity. z. Foundation level is checked, and the wheel stopper is provided in position. aa. Fire protection wall is provided between transformers, wherever oil quantity exceeds 2000 litres as per CEA regulation. bb. The firefighting equipment is provided. cc. Fencing and gate are provided as per CEA regulation/ OMR and earthed with earth grid. 5.4 SWITCHGEAR 5.4.1 HT/ LT Panel The following shall be checked/ ensured: a. The lifting lugs provided on the panel are used for lifting and erection purposes. b. Wherever the switchgear room is situated above the ground level, provision for lifting and shifting the switchgear to this room is available. c. The clearances around panel are as per approved drawings. d. Number of exit/ entry doors of switchgear room are as per approved drawings. e. Panel is firmly bolted to the base plate, which should be grouped properly. f. Panel is earthed with required number and size of earthing conductors. g. Panels are properly levelled and aligned in all directions. h. The tag numbers are prominently displayed on each panel on both front & rear sides, and that they match. i. Danger board, in local (vernacular) language, Hindi and English, has been provided. j. All panel door’s fixing bolts are in position and tightened. k. Bus bar connecting links are firmly connected with suitable size and type of bolts. l. All connections are tight. m. Bus bar (wherever provided) insulation is in good condition. n. Bus bar support insulators and bushings are free from cracks/ damage. o. All the openings have been sealed. p. All gaskets are in position. q. Insulating floors or mat conforming to IS-15652 of appropriate voltage level shall be provided in front of the panels for the safety of operating personnel. r. Insulation resistance value of bus bars to earth and in between is acceptable as per CEA regulation or applicable IS standard. s. Control wiring have been done as per approved drawings. t. Relays have been mounted and connected properly. u. External and internal painting are in good condition. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 11 OF ELECTRICAL EQUIPMENT v. All components in panels are numbered as per approved drawings and connections ferruled. w. Shock treatment charts in required number (in local language, Hindi and English) are prominently displayed in switchgear room. x. Partition, safety shrouds, explosion vents etc. are in position/ in good condition. y. Fire extinguishers of correct type and capacity have been provided, in required number as stipulated in OISD-STD-173. z. Exhaust fan/ pressurisation system wherever provided are in working order. aa. Bus bar terminal shutters are in order. bb. Unused holes are plugged properly. cc. Gas exhaust ducts, if installed, shall be sealed in such a manner that exhaust gases, if liberated, are confined to the duct & exhaust point only. 5.4.2 HT/LT Breaker The following shall be checked/ ensured: a. Breaker rack-in/ rack out system is in good condition. b. Shutter operates satisfactorily while circuit breaker is racked in and racked out. c. No part of breaker is damaged. Bushings are without any cracks/ damage and clean. d. Breaker is in healthy condition for operation (oil level/ SF6 pressure etc.) e. Breaker interlock mechanisms are operative. f. All releases are provided and connected properly as per design drawings. g. Alignment of fixed busbar contacts has been done properly with draw out contacts of breakers. h. Breaker contact resistance by milli volt drop test is within recommended values. i. Spring tension of breaker jaw contacts (tulip) is in order. j. Insulation resistance value of breaker is in order. k. Breaker operates satisfactorily in "TEST and SERVICE" position. l. In case of ACBs, arc chutes should be clean and properly fixed. m. Breaker 'ON' - 'OFF' (Electrical & Mechanical) indications are working. n. Breaker carriage alignment is in order inside the cubicle. Adequate lubrication of the carriage component is done. o. Breaker earthing contacts are in order. p. Carriage contact system is in working condition. q. Gaskets of panel doors and covers are in position. r. Earthing bond between panel and door are provided. s. Oil level viewing glass of all doors are in position and clean. t. Tested oil is used for oil circuit breakers. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 12 OF ELECTRICAL EQUIPMENT u. Trip circuit healthiness indicator is working (if applicable). v. Breaker trip & close time is within limits as per recommended value of OEM. w. In vacuum circuit breaker, gap between contact is maintained as per OEM recommendation in breaker open condition. x. In SF6 breaker, gas pressure is maintained, and indicator is in green zone. y. Correctness of indications of spring ‘CHARGED’ – ‘DISCHARGED’. 5.5 OUTDOOR SWITCHYARD EQUIPMENT The following shall be checked/ ensured in: 5.5.1 Structure (metallic) a. All foundations are ready and elevation levels are made as per drawings. b. Structures are fabricated as per design and are in good condition. c. Structures are erected in position maintaining safety clearances and all fasteners are tightened properly. d. Alignment of structures is in order. e. Base of structure is plastered all sides and sloped to avoid water accumulation. f. Earthing of structure is done (by strip welding, not by bolting) and connected to grid. g. Rust protection paint is applied wherever necessary. h. Identification colour for phases is marked on structure. i. Tagging of equipment is marked on structure for easy identification. 5.5.2 Insulators a. Are of correct voltage rating and tensile strength as per requirement. b. For high voltage string insulators, insulators are placed as per their capacitance grading and in combination of proper guard rings. c. No cracks/ damage and surfaces are clean. d. Handled with care to avoid damage. 5.5.3 Conductors and Bus bars a. Are of approved design and specification. b. Stringing of conductors is done using proper tools & checks. c. Sag is maintained to have minimum tension under all-weather condition and conform to required line and ground clearances. d. Expansion joints, if any, on tubular bars, are in good condition. e. Dead ends of tubular bus bars are sealed to avoid entry moisture, dust etc. f. Proper fasteners are used for connection and termination. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 13 OF ELECTRICAL EQUIPMENT 5.5.4 General a. Overhead earth screen/ mast is as per approved design. b. Switchyard fencing & gate are provided as per CEA regulation and fences are earthed & connected to earth grid at number of points (preferably by welding joints). c. RCC cable trench shall have proper covers. d. Gravels provided, should be of proper size and thickness. e. The water drainage of cable trenches is provided with proper gradient to prevent water accumulation. f. Water drainage system is clear from any obstruction in switch yard. 5.5.5 Lightning Arrestor a. Voltage and current rating of arrestor is matching with the approved drawings. b. Location and spacing between arrestors are as per approved drawings. c. Height of grading ring above ground is as per approved drawing. d. Porcelain surfaces are clean and not damaged. e. Connections to earth do not pass through any metal pipe. f. Earth connection from arrestor to counter is insulated from earth. g. Separate earth pit or connection with earth mat has been provided for each lightning arrestor. h. Insulation resistance value of arrestor is in order in line with OISD-STD-137. i. Line connection is made as recommended. j. Surge counter & leakage current monitor is located on the structure in such way that it is approachable for monitoring. Initial counter & leakage current readings should be recorded. 5.5.6 CT & PT (Current Transformer & Potential Transformer) a. The name plate details are as per approved drawings. b. Insulator surfaces are clean and free from dust and not damaged. c. Oil level (if applicable) is normal. d. No oil leakage. e. The connections are made properly. f. Insulation resistance values of CTs and PTs are in order in line with OISD-STD-137. g. Explosion vent in housing of CTs/ PTs are in good condition. h. Identification colour for phases is marked on CT/PT units. i. Continuity check of CT & PT with the protection circuit/ metering circuit. Shorting of the spare secondary terminals (if any) in multicore CT. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 14 OF ELECTRICAL EQUIPMENT 5.5.7 Isolator a. Name plate details are as per the approved drawings. b. Clearances of isolators are as per approved drawings. c. Clearances of isolator operating mechanism is in order. d. Moving parts of mechanism are lubricated. e. Interlock mechanism with earth switch, if any, is operative. Interlock mechanism between isolator and its earthing switch should be such that isolator should not close when earthing switch is in ON condition. f. Interlock mechanism between isolator and circuit breaker should be such that isolator always operate on off load. g. All three phases close/ open simultaneously, including alignment of contacts. h. Contact pressure is as recommended by manufacturer. i. Operating handle of Isolator and earth switch mechanism are earthed properly. j. Operating handle is painted red and earthing switch handle (if any) is painted green. k. Line connections are tight. l. Locking devices, for open and closed conditions, are in order. 5.5.8 Circuit breaker a. Circuit breaker base alignment of all the 3 poles is in order. b. Separate earthing, for base of all the three poles, is provided. c. No part of breaker is damaged. d. Interlock mechanism is functional. e. Control cables are routed through marshalling box. f. Gasket is in place and cover to be tightened; unused holes are to be closed. g. Bus terminations are stress free. h. Top up the oil to normal level (as applicable). i. SF6 gas pressure is maintained as per OEM recommendation. j. All the insulators must be thoroughly cleaned. k. Base foundation bolts must be provided with grease to avoid rusting. l. Explosion vents are not chocked/ blocked. m. All the mechanical/ electrical indicators are functional. n. Trip circuit healthiness indicator is working fine (if applicable). o. Trip/ close time and contact resistance to be recorded. All other OEM recommended installation practices must be adopted. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 15 OF ELECTRICAL EQUIPMENT 5.6 BATTERY 5.6.1 General Requirement The following shall be checked/ ensured: a. OEM authorised personnel are permitted for installation and commissioning of battery bank. Trained and experience person, following OEM recommendations, is also be permitted. b. Name plate details and number of cells are as per approved specification/ drawings. Name of equipment to which it is connected. c. Sufficient clearance is maintained around battery bank for ease of maintenance. d. Cell terminal connections are tight and coated with petroleum jelly. e. Battery support stand and cell insulators are clean. f. Cell numbers are properly fixed to cells. g. Cells have not developed any crack/ damage/ leak. h. Cells are mounted on insulated bases. i. Appropriate chemical treatment chart is prominently displayed inside the room. j. Cable connections are made with recommended lugs. k. Alkaline batteries are not in the same room where lead acid cells are installed. l. Ventilation & Temperature requirements should be as per design of the Battery Bank type, size & room, as recommended by OEM. NFPA70B may be taken for reference. m. Rest period after filling the electrolyte should be as per OEM recommendation before start of charging. n. Use insulated tools while working on the battery to prevent accidental short circuit and consequent damages. o. During installation correct polarity of cells in the bank and preferably their terminals should be marked to red and black colour. p. Positive and Negative Cables from battery Bank to Battery Charger/ Breaker are properly identified and marked. Preferably, Red Colour for Positive Cables and Black Colour for Negative cables should be used. q. Do's & don’t to be displayed in the Battery Room in the local, Hindi and English language. r. Battery MSDS (material safety data sheet) shall be displayed in the battery room. Note: During installation of battery, appropriate Personal Protective Equipment (PPE) such as suitable rubber gloves, long sleeves/ protective clothing and appropriate splash goggles or face shield should be used as recommended in MSDS. 5.6.2 Lead Acid Battery bank The following shall be checked/ ensured: a. Chemical resistance tiles/ paint has been provided on floor and side walls up to up one- meter height from the floor. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 16 OF ELECTRICAL EQUIPMENT b. An eyewash shower and wash basin are available nearby with potable water. c. Voltage and specific gravity of all cells are as per manufacturer's recommendations. d. Float level indicators are free, and cell is filled up with electrolyte to marked level. e. Gas vents are provided and free from blockage. f. Suitable drainage and collection pit has been provided for likely electrolyte spillage. g. Precaution to be taken while mixing acid in water very slowly to prevent fast exothermic reaction. Never add water in concentrated acid. 5.7 LIGHTING EQUIPMENT & ACCESSORIES The following points shall be checked/ ensured: a. The area classification of the location. b. The installation and its components meet the requirements as set by the environmental conditions and are appropriate to area classification. c. The installation conforms to approved drawings. d. Location of the equipment should be accessible for ease of maintenance. e. The distribution box and its circuit numbering are correct, and all electrical components including protective devices are rated appropriately as per connected load. f. Connectors are provided in junction boxes and are of antivibration design wherever necessary. g. Voltage at the farthest fixture from the power source should be within the prescribed limit as set by the luminaire manufacturer. h. All fasteners are provided and tightened (especially of flameproof fixtures). Safety features, such as separation sheets, fuse base screening interlocks, door switches, padlock facilities and pad locks, are in order. i. No unauthorised site modification is permitted on flameproof enclosures. j. Outdoor lighting panel has weather protection (IP: 55) and is provided with canopy, wherever necessary. k. The gaskets are in position. l. The correct size of cable glands and lugs are used, and job has been performed by trained personnel. The glands and lugs are used correctly according to feeder cable size. m. The earthing bus bar and cable earthing connections inside the distribution box are made properly. n. The equipment external earthing from the earthing grid is made properly. o. The lighting fixture is earthed externally with adequate size of GI wire (Minimum No. 10 SWG) wherever 2 core cables (in building etc.) are used. In case of usage with 3/4 core cables, 3rd/4th core of the cable should be used for internal earthing connection inside the lighting fixture. Surface PVC conduit the earth wire is run exterior to the conduit, without touching conduit, maintaining proper clearance. p. The fixture is firmly supported. q. Support structure and poles are earthed and painted. r. Unused entries are blocked with metallic grommets. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 17 OF ELECTRICAL EQUIPMENT s. In flameproof enclosures, unused entries are blanked with flameproof threaded metal plugs. t. For open type wiring, only cable of recommended type is used. 5.8 CABLE 5.8.1 Cable Laying The following shall be checked/ ensured: a. While laying cables in a new project, it should preferably be commenced after readiness of the required RCC trench and/ or the planned overhead structure so that cables are not left exposed to the vulnerable condition of mechanical damage due to physical impact and water entry. b. Cable size, voltage grade and type should comply with Approved for Construction (AFC) drawings. c. Cable laying is done strictly as per Indian Standard. Special provisions as prescribed in IS:1255 sec 8.8 to be followed for laying of single core cables. d. No damage arises to the cables during laying. The bunch of cables spread in rounded loops for further laying should not have sharp bends keeping in mind the required bending radius as per IS:1255. e. Cable to be planned away from heat sources, gas, water, oil, drains piping, air- conditioning duct etc. f. Cables are identified close to their termination point, (Cable numbers are punched on aluminium straps 2 mm thick and securely fastened to the cable, wrapped around it) and along the route at recommended intervals particularly if cables are laid in parallel. g. Cable route markers are provided in a permanent way at location of changes in the direction of cables and at intervals of not more than 30M and at cable joint locations. h. The concrete cable trenches are filled with sand, to avoid accumulation of hazardous gases, and RCC covers of trenches, in process area, are effectively sealed to avoid ingress of chemicals and oil. i. As far as possible, each cable tray contains only one layer of cables, and minimum required vertical clearance between racks is maintained. j. In case, cables are laid directly underground, the trench bottom is filled with a layer of sand, and a protective covering of 75 mm thick second-class red bricks/ RCC slabs (Ref. Annexure No. 1 for typical section) over sand. The minimum depth of laying from ground surface to the top of cable shall be as per IS:1255. k. Before covering with sand, every cable is tested for insulation resistance test and cable which proves defective is replaced. l. All the cables (power, control, lighting, and communication) are laid completely as per cable schedules and are tested for continuity. m. For Non-Fire-Retardant cables, straight through cable joints on cable trays shall be painted with fire retardant paint. Avoid straight through cable joints inside cable cellars, if inevitable same shall be painted with fire retardant paint. n. All wall openings/ pipe sleeves are effectively sealed after installation of cables to avoid seepage of water inside building/ lined trench. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 18 OF ELECTRICAL EQUIPMENT o. Where cables rise from trenches to motor, control station, lighting panel etc. these are taken through GI/ hard PVC protection pipe sleeves, and ends should be sealed with weatherproof sealing compound to prevent ingress of moisture, after cabling. p. Conduit ends above grade are plugged with approved weatherproof sealing plastic compound. q. At road crossing and other places where cables enter pipe sleeves, recommended bed of sand and bricks are provided so that the cable do not slacken and get damaged at pipe ends. Metallic pipe ends should be bell mouthed. r. A separate earth strip is run along each cable tray. Equipment earthing is taken from the earth grid and not from the cable rack earthing. s. Cables are clamped on trays using aluminium clamps at intervals not exceeding 3 meters. t. Cable joints in power & control cables are avoided as far as possible. In case a joint is unavoidable, the following are ensured: The number of joints is restricted to minimum. The locations of joints are identified with permanent markers. All joints in hazardous areas are preferably underground (especially for H.V. cables). All joints are carried out as per cable manufacturer’s recommendation. 5.8.2 Cable Termination The following shall be checked/ ensured: a. Identification number tags of the cable, for the equipment to which the supply is fed, are provided correctly at both ends of the cable. b. The tag size is not less than 2 mm thick and 20 mm wide and of enough length to contain all required details. c. The core or phase sequence at the destination end should be matching with respect to the source end especially wherever junction boxes/ joints are provided in the route. d. Cable termination is done with proper crimpling tool, appropriate to lug size and use of antioxidant paste. e. For cable glands of flameproof design, identification mark on the gland preferably embossing symbol as per IS should be available, and the required laboratory certification is verified. f. In Zone 0 and Zone 1 area, double compression gland shall be used. g. The ferruling on all terminations conforms to wiring drawings. h. Tightness of all terminations (Confirm the bimetallic washer, if required, is correctly installed). i. Earthing connections and earth continuity are checked. j. Wherever lugs are used for termination, size of lug matches with cable core and material of lug is suitable for application. k. Proper mechanical protection of the cable is available. l. Pipes, if provided, are sealed on both ends. m. Bending radius is as per IS:1255 standard. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 19 OF ELECTRICAL EQUIPMENT n. Before backfilling cable trench, the straight through joints of high-tension cables are tested for leakage current. o. Cable terminations are done as per the manufacturer's instructions. p. Insulation resistance values between phase to phase and phase to ground after termination (before connecting to equipment) are in order. q. Cables near the termination are supported to relieve the strain on the terminals. r. All the spare cores of the control cables are to be earthed to panel earthing at one end to avoid rise of voltages in spare cores and unwanted operation of the connected equipment. 5.9 EARTHING GRID The following shall be checked/ ensured: a. The earthing installation has been done in accordance with IS:3043. Approved earthing drawing and specifications are available. b. The earth mats should be provided as per the AFC (approved for construction) drawings. c. The main earth loop is laid at a depth of 500 mm below grade level. Wherever cable trenches are available, the earth lead is laid in the trenches, and firmly cleated to the sidewall of concrete lined trenches. The earthing strip is protected against mechanical damage in process unit areas. The earthing conductor is run along cable trays wherever possible. The earthing conductor is suitably cleated and electrically bonded to the cable tray at regular intervals. The earthing for equipment is tapped from the main earth conductor and not from the cable tray structure. d. All joints in the main earth loop are made in such a way that reliable and good electrical connections are permanently ensured. All joints below grade are welded and suitably protected by giving two coats of bitumen and covered with hessian tape. All joints above grade should be given two coats of bitumen to avoid oxidation and insulation film formation of the strip surface. However, if there are specific design guidelines, the same will prevail to take care of corrosion problems and to ensure thereby good reliability of earthing connections. e. Preferably earth strips should be joined by means of welding. Lap welding with an overlapping of strip equivalent to double the width of the strip should be available and all the four sides are continuously welded. In case joints through connector/ lugs, ensure no gap between the surface of stripes by minimum two or more bolts. f. Conduits in which cables have been installed are effectively bonded and earthed. For this bonding, not less than 6 SWG wire and lugs are used with brass or GI nut & bolt with minimum 5 mm diameter. g. Earth pit locations are identified by visible markers. h. All earth electrodes and grid are tested for earth resistance by means of standard earth test megger, duly calibrated. i. Earth resistance of the electrode, grid/ mat should be maintained sufficiently low and should meet OISD-STD-137 requirement. j. The electrodes have a clean surface, not covered by paint, enamel, grease or other materials of poor conductivity. All earth electrodes are so located avoiding interference with road, building foundation, column etc. k. Individual earth electrodes are provided for each lightning arrestor and lighting mast. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 20 OF ELECTRICAL EQUIPMENT l. In case of conveyors, the earth strip runs along the entire length of conveyor. m. Disconnect facility is provided for the individual earth pits to check their earth resistance periodically. n. All electrical equipment, operating above 250 volts, are doubly earthed by connecting two points on equipment to a main earthing grid. The earthing ring should be connected via links to several earth electrodes. The cable armour should be earthed through the cable glands for LT cables. For HT cable, the armour shall be brought out & connected to the earth bus. o. In hazardous areas, all major process equipment is connected to the earthing grid by means of welding or nut/bolt connection. In case of nut/bolt connection, spring washers should be used, and complete surface contact is ensured. Number of nut & bolts should be increased as per surface area. All pipes are bonded and earthed on entering the battery limit of the process area. p. The shield wire is connected with the main grid solidly and not through supporting steel structure. All paint, scale, and enamel are removed from the contact surface before the earthing connection is made. q. All earthing connection for equipment earthing is taken from the earth plate mounted above ground, wherever provided. r. Anchor bolts or fixing bolts are used for earthing connection in equipment. s. All hardware used for earthing installation are hot dip galvanised or zinc passivated. t. Lighting fixtures and other LT equipment are earthed through the extra core provided in the cable for this purpose. 5.10 Heat Tracing The following shall be checked/ ensured: a. Specification of all components e.g., connector, tee, jump over etc. should be as per approved drawing. Installation of complete system as recommended by OEM. b. Heat tracing caution tag should be placed at the outer surface of thermal insulation under which heat-tracing cable has been installed. If insulation is removed or replaced, make sure that the caution tag is also replaced. Caution tags should be installed on piping, vessels, pumps, and similar equipment where heat tracing has been provided. c. The Identification tags on the heat tracing circuit/ its junction boxes, shall clearly mention the feeder/ circuit number feeding power to it. d. While installing the heat tracing cable, special care should be taken at bends/ turning points to have the bending radius as recommended in its manual and design document to avoid any damage. e. Insulation value of the heat tracing cable shall be checked and ensured that it is in acceptable limits as per its OEM manual. f. Ensure that temperature setting of the thermostat and earth fault protection are as per its design for each circuit. g. All the heat tracing circuits in process area or offsite piping/ vessels must have healthy ELCB/ RCCB in each circuit and its rating must not be more than 30 mA. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 21 OF ELECTRICAL EQUIPMENT 5.11 Capacitor Bank The following shall be checked/ ensured: a. Visual soundness of the structure of the capacitor bank, where it is to be installed. b. Measure the capacitance of each capacitor unit & bank and keep the measurements as benchmark data for future comparison to check for any deterioration. Ensure that there is no leak from the capacitor units. c. All terminal connections are tightened properly. d. All insulators are clean to prevent the possibility of dirty porcelain creating a flashover danger. Inspect all porcelain insulators for cracks or breaks. e. Prior to energizing the bank, verify the capacitance values of each phase as per their design. Variations in the phase wise capacitance values should be within allowable limits to avoid the unbalance in the voltage. 6. EQUIPMENT USED IN HAZARDOUS AREA The following shall be checked/ ensured: a. Apparatus is appropriate to area classification. b. Surface temperature class is correct as per area classification. c. Apparatus subgroup is correct. d. Equipment and their fittings are certified by appropriate statutory authority for usage in hazardous area and same is embossed on the surface of equipment/ name plate as per statutory guideline. e. Apparatus carries the correct circuit identification (apparatus should be positively identified with its circuit to ensure that correct isolation can be carried out). f. Enclosures, glasses, and glass/ metal seals are satisfactory. g. Machined surfaces are free from corrosion, dirt and paint. Same shall be painted, if necessary, considering insurance clause. h. There is no unauthorised modification. i. Bolts, glands and stoppers are complete, and tight. j. All conduit run and fittings are tight and free from corrosion. k. Earthing is made as per standard IS:3043. l. Condition of enclosure gaskets is in good condition. m. Electrical connections are tight. n. Motor fans & couplings are not rubbing on cowls guards. o. Lamp rating & type are correct. p. There is no leakage of compound from stopper or cable boxes and properly filled. q. There is no damage to cables, cable sheaths or cable glands (attention should be paid to flexible cable used with portable apparatus). r. Apparatus is properly protected against corrosion, weather, vibration & other adverse factors. s. Guards, where used, are available in correct position. t. Supporting arrangements are strong and adequate. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 22 OF ELECTRICAL EQUIPMENT 7. TEMPORARY ELECTRICAL INSTALLATION Check that temporary installation conforms to safety requirement and additionally complies with following recommendations: a. Only authorized and trained personnel familiar with electrical installation shall be deployed at the site. b. Load requirement of temporary installation is firmly established and that the total load drawn for all activities is well within capacity of temporary installation. c. Properly sized plug sockets are used to cater the load requirement. All electrical gadgets used shall be of industrial type only. d. Earthing is provided for all portable/ static equipment as per IS 3043. In case of 3 phase temporary panel, double earthing is to be provided. If required, separate earth pits to be made and resistance recorded. GI wire should be used with lug and minimum size of 8 SWG. e. Periodical monitoring of load is done to ensure compatibility with switch rating/ cable sizing. f. Appropriate HRC fuses along with isolator switch fuse unit (SFU) shall be used. Appropriate capacity of MCCB/ RCD shall be used. g. Local isolation should be accessible. Phase and neutral can be simultaneously isolated. On/ Off position on the isolator should be clearly marked with distinct indication. h. Voltage rating of supply matches with safety requirement as stipulated in CEA regulation. For example, when working inside vessels or at heights etc. voltage of electrical appliance shall not be more than 30 volt. In case higher voltage is necessary, isolating transformer shall be used with provision to isolate primary and secondary both. i. All electrical appliances are properly protected against rain, water, dust etc. j. Portable equipment is transported from one site to another only after it is disconnected electrically. k. Only approved make of industrial type switchboard shall be used. The switchboard shall be vermin proof and live parts at electrical outlets should be properly protected from getting in touch with person accidently. l. Approval of scheme shall be renewed before its expiry if work continues. m. Length of flexible wire shall be limited to maximum 30 mts. and there shall be no joints in this length. n. 2 core wires shall be used only for 24 volts, above 24 volts, 3 core wires shall be used (P, N & E). o. Whenever portable equipment is used, provision of ELCB/ RCCB shall be considered. p. Three-phase power supply connection in LT system should be through 3-1/2 core cable. However, in case of LT system having single-phase load connection, should be through 4 core cable. q. Before energising the installation, the engineer-in-charge or his authorised representative should certify the soundness of installation, after conducting tests as per CEA regulation. Note: Temporary installation covers construction power requirement, turn around jobs and temporary jobs in running plant. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 23 OF ELECTRICAL EQUIPMENT 8. DOCUMENTATION 8.1 The installation of equipment shall not commence without keeping ready the following basic documents: a. All approved for construction (AFC) drawings (including layout, single line diagram etc.). b. All approved vendor drawings for equipment and foundation (including schematic, inter connection & wiring drawing). c. Statutory clearance from the Chief Electrical Inspectorate/ DGMS as applicable. d. Test certificate from the manufacturer for having successfully conducted all the prescribed test at the manufacturer's site (duly certified by owner's representative). 8.2 The installation after completion shall not be energised without keeping ready the following basic documents: a. All the field test reports with satisfactory test results as specified in the CEA Regulation/ technical specifications (duly witnessed and certified by owner's representative). b. Statutory clearances from the Chief Electrical Inspectorate/ DGMS etc. as applicable, for energisation of installation along with duly approved drawing. c. Final as-built schematic/ control circuit drawing incorporating all field modification/ revision. d. Protective Relay setting (supported by the basic calculation to arrive at these setting). e. Operation/ maintenance instruction manual and list of recommended spares. 9. MISCELLANEOUS The following recommendations shall be adhered to: 9.1 Fasteners a. Nut-bolts: Cadmium coated MS bolts: Copper, GI b. Washers: Tinned copper, Cadmium coated MS; GI c. Strips: Copper, GI d. Clamps: GI, Aluminium, Copper, Aluminium alloy e. Flexible: Tinned copper connection f. Lugs: Copper, Aluminium, Bimetal g. Screws: Brass 9.2 Lifting Tackles a. All lifting tackles shall be suitable for the application under consideration. b. It shall be periodically inspected and tested as per factory rule of state. c. Chain pulley blocks shall be well lubricated. d. EOT cranes shall be tested for proper operation and load tested periodically. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 24 OF ELECTRICAL EQUIPMENT 9.3 Insulating Material A. Tape a. Voltage rating of tape shall be suitable for the application. b. Number of layers of tape shall be as per the requirement of voltage level and environmental condition. c. Tape should be of PVC, Fibreglass, Polyester, Cotton silicone, Empire (material) and with waterproof/ fire resistant characteristics. B. Sheet Should be of Bakelite, Dough Moulding Compound (DMC), Sheet Moulding Compound (SMC), fibreglass. C. Sleeves Should be of PVC, Fibreglass, Silicon, rubber, Heat shrinkable sleeves. D. Compounds Should be of Bitumen, Epoxy, Plastic, Silicon. E. Varnish Should be of Class B/ F of air dying type, baking type, stress grading. 10. REFERENCES The following codes, standards, and publications have either been referred to or used in the preparation of this document and the same shall be read in conjunction with this document: a. OISD-STD-137 b. OISD-RP-146 c. OISD-RP-148 d. OISD-STD-113 e. OISD-STD-173 f. National Electrical Code NEC-1985 of BIS. g. Bureau of Indian Standards (BIS) h. IS:1255/ IS:10028/ IS:3043/ IS:5571/ IS: 15652 i. Instruction manuals for manufacturers. j. IS/IEC 60079-0/ 1/ 11/ 17/ 19 k. NFPA70B l. Indian Electricity Act-2003; CEA Regulation “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 25 OF ELECTRICAL EQUIPMENT 11. ABBREVIATIONS a. AFC - Approved for Construction b. CEA - Central Electricity Authority c. CT - Current Transformer d. DGMS - Directorate General of Mines Safety e. ELCB - Earth Leakage Circuit Breaker f. EOT – Electric Operated Trolley g. GI - Galvanised Iron h. IEC - International Electrotechnical Commission i. IP - Ingress Protection j. IS - Indian Standard k. LT - Low Tension l. MSDS - Material Safety Data sheet m. OEM - Original Equipment manufacturer n. OISD- Oil Industry Safety Directorate o. OMR - Oil Mines Regulation p. PESO - Petroleum and Explosive Safety Organisation q. PVC - Polyvinyl Chloride r. PT - Potential Transformer s. RCCB - Residual Current Circuit Breaker t. RP- Recommended Practice u. STD - Standard v. SLD - Single Line Diagram w. SWG - Standard Wire Gauge “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 26 OF ELECTRICAL EQUIPMENT “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.” OISD–RP–147 INSPECTION AND SAFE PRACTICES DURING INSTALLATION Page No. 27 OF ELECTRICAL EQUIPMENT Major changes in revised edition S. Existing Document Revised Document No. 01 Title: “Inspection And Safe Practices Title: “Inspection And Safe Practices During During Electrical Installations” Installation Of Electrical Equipment” 02 Contents Added new topic 5.10 Heat Tracing 5.11 Capacitor Bank 03 Scope: 1. Added overhauling of equipment too. 2. Clarity added that “applicable only to onshore” 04 Definition: 1. New definition added at 3.2, 3.3, 3.11, 3.12, 3.13 2. Existing definition in 3.4, 3.5, 3.6, 3.7, 3.8 changed as per IS 5571/5572 05 Clause 4.0 special requirement 1. Added word like PESO, CEA, DGMS and removed obsolete words like IE Act and Rule 1956, Tariff advisory committee. 2. Changed few sequencings. 3. Added new requirement at t, u and v. 06 Clause 5.1 Generator Requirement of double and distinct earthing added at sub clause w. 07 Clause 5.2 Motor Requirement of double compression flameproof gland added in hazardous area at sub clause g. 08 Clause 5.3 Transformer Requirement of DGA added in sub clause e.ii 09 Clause 5.4.1 (HT/LT Panel) Requirement of insulating mat added in sub clause q and new sub clause at cc. 10 Clause 5.4.2 (HT/LT Breaker) New requirements added at sub clause u, v, w, x and y. 11 Clause 5.5.5 Lightning Arrester New requirement of surge counter and its location added. 12 Clause 5.5.7 Isolator New requirement of interlock added. 13 Clause 5.6 Battery Divided in two part; general requirement and requirement of lead acid battery. 14 Clause 5.8.1 Cable Laying Cable protection during construction addressed. 15 5.10 Heat Tracing New topic added. 16 5.11 Capacitor Bank New topic added. “OISD hereby expressly disclaims any liability or responsibility for loss or damage resulting from the use of OISD Standards/Guidelines.”

OISD-RP-147 PDF - Inspection and Safe Practices During Installation of Electrical Equipment (2022)

Document Details

Tags

Related

Summary

Full Transcript

Upgrade to continue