OHE Safety Rules PDF

SAFETY RULE FOR OHE 10.0 General 1. The following rules are supplementary to the General and Subsidiary Rules and the instructions contained in Volume I. 2. Printed boards containing instructions regarding treatment of persons suffering from electric shock should be exhibite...

SAFETY RULE FOR OHE 10.0 General 1. The following rules are supplementary to the General and Subsidiary Rules and the instructions contained in Volume I. 2. Printed boards containing instructions regarding treatment of persons suffering from electric shock should be exhibited in every OHE maintenance depot, equipment room, switching station, cabin, OHE Inspection Car shed, loco shed, OHE Inspection Car and wiring train and also in offices of SM, ASM, CYM, AYM and HTXR. 3. First Aid Boxes should be kept at every switching station, maintenance depot, in OHE Inspection Car, breakdown vehicle and wiring train. 4. Ropes, come-along clamps, Trifor etc should be tested once in six months at least, in the presence of an ATFO and record of such tests maintained in each depot. 10.1 Documents to be kept with OHE Supervisors for Work on OHE. 1. The ATFO(OHE) or other official supervising OHE work shall have with him a complete set of structure erection drawings, lay out plans, sectioning diagram and general supply diagram etc pertaining to the overhead equipment under his charge. He shall also have with him Station Working Rules for the stations between which he is working. He shall, in addition, keep with him all useful information regarding the running of trains over his section. 2. It shall be the responsibility of the TFO/ATFO(OHE) or in his absence the senior- most official in-charge of the work to ensure that all safety rules prescribed are actually observed by the staff when carrying out work on traction installations. It shall be the duty of the supervisor to remind the staff periodically of the various safety rules to be observed at work site. 10.2 Permit to Work Before commencing work on any part of the dead OHE or within 2 m of live OHE, a permit to work shall be obtained from TPC or other authorized person. 10.3 Protection of Staff against Traffic Movements and Protection of Trains 1. The supervisory official in-charge of work on OHE shall observe relevant provisions of GR and SR for protection of trains before work on OHE is commenced and for the whole time the work is in progress. 2. Measures laid down for power block shall be observed by all concerned to prevent accidental energisation of the section under power block on account of electric train movements. 10.4 Earthing before Commencement of Work 1. All metallic parts within reach (either directly or through tools etc) shall be earthed, after they are made dead. 2. Each working party shall be protected by at least two independent earths, one on each side of a working party. Over Head Equipments Page 159 3. If the distance between the working parties exceeds 100 m intermediate earths shall be provided in such manner as to ensure that the distance between earths does not exceed 100m. 4. Even when earthing is provided by isolator switches with earthing heels, additional temporary earths as about shall also be provided. 10.5 Procedure for Providing Temporary Earths The following sequence of operations shall be carried out while providing temporary earths on OHE:- 1. Men shall be posted on both sides of the site of work to warn the working party of any approaching train on the same track and adjacent track(s). 2. The permit-to-work shall be obtained prior to commencing work to make sure that power supply has been switched off. 3. For providing temporary earth on the OHE or other equipment after it has been made dead, only discharge / earthing pole assembly specially designed for this purpose alone should be used. The cable shall be flexible and should have adequate cross- section (40 mm2) to be able to withstand short circuit currents. 4. Fix the earthing clamp securely to a mast at least one span away on one side of the work site after making sure that the mast to earth rail bond of this masts is intact. Alternatively, the clamp may be fixed to the bottom flange of one of the traction rails, taking the cable under the rails. In single-rail-track-circuited sections, the earthing clamp should be fixed to the traction rail i.e., non-track-circuit rail; on double-rail-track-circuited sections the earthing clamp should be fixed to the mast. The mast-end or rail-end clamp of the discharge / earthing pole assembly should be checked for tightness just before connecting the top clamp on to the OHE as the earthing clamp fixed to the rail or mast in advance could have worked loose. 5. Hook securely with a snap action the top clamp of discharge / earthing pole assembly to the OHE conductor close to the mast / structure and tie the earthing pole to the mast / structure. Never hook on the top hook of the earthing cable to the OHE, till the other end has been first connected to earth. 6. The earthing clamps should always be fixed to the traction rail or mast/ structure first and then the top clamp should be hooked to the OHE to be earthed. 7. Repeat operations 4 and 5 for the second temporary earth on the other side of the working party. 8. After temporary earths have been fixed on the OHE on both sides of the work site, staff may proceed with the maintenance work. 9. After work is completed and men, materials and tools have been removed and the OHE is clear, the above earthing rods may be removed in the reverse order i.e., first remove the hook on the OHE and then the clamp fixed to the rail or mast / structure. After warning all staff that supply will be restored and that they should keep away from the equipment, te permit-to-work may be returned and supply restored. Over Head Equipments Page 160 10.6 Precautions in Regard to Discharge / Earthing Pole Assembly 1. The continuity of the cable connection between the top clamp and the earthing clamp should be checked once a fortnight. Cable should be renewed if more than 20% strands are broken. During use, cable should be continually examined for fraying and breakage of strands. Discharge / Earthing pole assembly should be inspected by TFO/ATFO once a month. 2. During accidents when slewing the OHE and in similar circumstances, the discharge / earthing pole assembly should be provided at a location where it is not likely to be interfered with during crane working or due to work on the permanent way. 10.7 Work on OHE or any Conductor having a Sectioning Point When work is to be carried out on OHE or conductors which are not electrically bonded, following additional precautions are required: i) The two sections of conductors or ends of conductor which may have snapped may be at different potentials. Each end should, therefore, be separately earthed at two points after switching off supply to both parts of the OHE or conductor. ii) This precaution should also be observed when working on or in the vicinity of a sectioning point and cut-in insulators. 3. Neutral Sections should be treated as live equipment and earthed separately at two points on either side of the work party before commencing work. 4. When work is to be carried out on an isolator, both sides of the isolator should be earthed at two points or more conveniently, isolator jumpered temporarily. 10.8 Protective Helmets At the work-site, staff are advised to wear helmets to protect their heads against any tools or equipment which may drop down accidentally, as well as to minimize head injury in case of accidental fall from a height. 10.9 Safety Belt Staff working on structures or a ladder are advised to protect themselves against an inadvertent fall by wearing a safety belt for supporting themselves by a rope sling. 10.10 Rules for use of Ladders 1. It shall be the responsibility of the supervisor to ensure that ladders are stored in a protected enclosure properly maintained and reconditioned as often as required. A ladder should never be in such a position so as to likely to fall on a live part. 2. Ropes used with ladders should be of cotton or jute. Use of metallic ropes is prohibited. A ladder should be held by one person on the ground to prevent slipping, while the top end should be tied to the supporting structure or conductor to keep it in position and prevent in sliding away. 3. Ladders should never be allowed to fall on or rest against the contact wire. 4. If the nature of the work involves risk of the conductor breaking into two parts (due to opening out of sleeves or splices) the ladder shall not be rested against the conductor. Trolley ladders shall be used in such cases. Over Head Equipments Page 161 5. More than one person shall not normally be allowed on a ladder as far as possible. 6. Climbing on a ladder with wet or slippery foot-wear is forbidden. 7. Ladders should not be used for transporting materials. 8. A rope should be used to pass tools or any equipment to the men working on a ladder. 9. No one should stand directly below a work spot under a ladder. 10.11 Other Important Precautions to be taken while Carrying out Works on OHE 1. The useful cross section of a conductor shall not be reduced while making joints. 2. Any contact with conductors which are not specifically earthed is forbidden. 3. The strength of the anchoring rope should not be less than that of the cable to be anchored. 4. Temporary anchoring of conductors should only be done by using stranded flexible steel cable at least of the same tensile, strength as the cable to be anchored. Use of two cables of different strengths joined together is prohibited. Use of cotton, jute or other non-metallic ropes for anchoring is forbidden. 5. Structure bonds and cable connections of the structure to earth shall be maintained in proper condition. No heavy materials should be stacked on the rail bonds; transverse bonds between two rails of the same track as well as rails of different tracks shall also be maintained in proper condition. 6. Where rails to which structures are connected are replaced, the structure shall be connected to the new rail immediately after it has been laid. 10.12 Procedure for Effecting Shut-Down for Work on Auxiliary Transformers Power supply to auxiliary transformers is effected through fuse-switches on the 25 kV side and the LT side is controlled through fuses or double pole iron clad switch fuses. Isolating fuse switches should be opened out and fuses removed both on the HT and LT sides and the transformer earthed before starting work. 10.13 Work on Overhead lines Running Parallel to Electrified Tracks No work on any span of any overhead line (LT power line or other line) running parallel to an electrified track where the minimum distance between the nearest conductor of the overhead line and he centre-line of the nearest electrified track is less than 8m, should be done without switching off power from the 25kV traction line(in addition to making dead and earthing the overhead line on which work is to be carried out, in the normal manner ) excepting for the following specific items for work : 1. Replacement of lamps, if below line. 2. Painting of structures/poles upto a distance of 2 m from the live wires of the power line.\ 3. Reinforcement of foundations where such reinforcement does not involve any prior weakening of the foundation at any time during the work. 4. Replacement of aerials fuses. Over Head Equipments Page 162 10.14 Isolation of Booster Transformers To isolate a booster transformer for maintenance or other work, the following sequence of operations should be carried out:- 1. Where no isolator is provided a permit-to-work should be obtained for both the elementary sections, the BT should be disconnected from the OHE and the OHE made through by jumpering. 2. When an isolator is provided to disconnect the BT primary winding from 25kV lines, power must be switched off from both the elementary sections to which the BT is connected after which the isolator should be opened to disconnect the BT from the OHE and to make the OHE through. 3. The secondary winding of the BT should be disconnected from the return conductor and the return conductor made through by jumpering. 4. The return conductor should be earthed at the location where the BT has been disconnected; and the mid-point rail links on both sides of the BT should be opened so that booster cells on either side will extend over longer section temporarily. 5. With the OHE and return conductors made through, 25kV power supply may be restored. It should be noted that during the period when a BT has been disconnected from service, the interference or adjacent communication circuits will be enhanced. In view of this the defective BT should be replaced with a good BT with the least possible delay. 10.15 Isolators Isolating Switches on the 25kv system shall not be opened or closed when current is passing through them. Normally, isolators should only be opened or closed, after power supply to the section has been switched off by opening the appropriate interruptor. 10.16 Petroleum Sidings The following arrangements/precautions would be necessary:- Arrangements i) An equi potential link between the petroleum sidings installation earth and the track via a switch. ii) Setting up of neutral zones (insulating joints) in the track to avoid any risk of propagating stray current. iii) Setting up of neutral zones / sections in the contact wire similar to loco inspection pits. iv) The tracks must be provided with longitudinal bonds on both the rails as well as transverse bond (30m intervals). All masts and metallic structures in the vicinity of the track / sidings should be provided with structure bonds. Copper rivets should be used for bonding. v) 10 ohm earths must be connected to the petroleum siding on each side at the insulated joint. Precautions i) No oil tanker is permitted to stable under live OHE for inspection purpose. ii) Fueling to be done by side filling arrangement only. iii) Pipe lines in the vicinity of the track should be properly earthed. Over Head Equipments Page 163 iv) Minimum 2 m electrical clearance from live OHE of the adjacent track or only other structure nearby must be maintained. v) During filling/loading and unloading of petroleum products, the isolators at the neutral section of OHE should be kept open to ensure that the OHE is dead and earthed. 10.17 FORMS AND REGISTERS 10.17.1Records to be maintained. The recommended proforma for Power Block and Permit-to Work messages have been given. Particulars of other essential records to be maintained in regard to OHE maintenance are given below: 1. Daily Report of OHE Maintenance to be submitted by the Supervisor in-charge of field work to ATFO. The form in which reports are to be submitted by the ATFO/CTFO to AEE (TrD) and Sr. DEE / DEE (TrD) may be laid down locally by each Division. 2. Register for Foot-Patrol Reports. The reports regarding foot-patrolling should be entered by the Linesman in a Register to be maintained for the purpose by each Section Supervisor. 3. Cantilever Assembly Maintenance Register 4. Register of Contact Wire Thickness Measurements 5. Register of Clearance under over line structures 6. Register of Earth Resistance Measurements 7. Register of Current Collection Tests shall be maintained. 8. Register of Regulating Equipment shall be maintained by each depot / sub-depot for its jurisdiction. This Register should have a page allotted for each Regulating Equipment. Particulars of adjustments carried out, amount of catenary and contact wire cut etc. shall be recorded in this Register, indicating the dates on which these items of work have been done. 9. Register for isolator Switches shall be maintained by each depot / sub-depot indicating dates on which the isolators have been inspected and the details of work carried out 10. Register for Turn outs and Cross overs shall be maintained by each depot / sub-depot. This should indicate the dates on which each turn out / cross over has been checked for adjustment and particulars of work done. 11. Register of Vulnerable Foundations: This should contain details of checks carried out on foundations at vulnerable locations, such as on over bridges, embankments susceptible to erosion etc. 12. Register of Feeder Lines shall be maintained by concerned depots/sub-depots to indicate particulars of patrolling of 25kV feeder lines and maintenance carried out on such feeder lines. 13. Register of Critical Implantations: The annual check of implantation at critical locations shall be recorded in this Register. 14. Register of Level Crossing : This should contain dates on which height of contact wire at Level Crossings as well as that of the height gauges at Level Crossing have been checked. 15. Register of Splices. 16. Register of OHE Break-downs: Each depot/sub-depot should maintain particulars of OHE break-down occurring in its jurisdiction. For each break-down a page should be Over Head Equipments Page 164  allotted. References to detailed reports submitted should also be given to facilitate investigations subsequently. Register may also be maintained for any other additional items in the proforma prescribed by CEE. The register should be of A-4 size. As they are required for permanent record they should be cloth-bound. The nomenclature of the register should be shown on the cover in 6 mm block letters. The Supervisor of the depot/sub-depot will be held responsible for ensuring that these register are maintained up-to-date. Officers and Senior Supervisors during their inspections should scrutinize these registers and initial a few important entries. 10.18 Standard Forms for Power Block Messages Typical forms for power block messages are attached at the end of this Chapter. Form ETR.1. This has 3 parts and is used for exchange of message between TPC and Section controller when a power block is to be imposed or withdrawn. When TPC and the Section controller are located in adjacent rooms, the messages will be made out in duplicate and sent to the other party obtaining the acknowledgement of the receiving party on a carbon copy. When they are located far apart, the messages will be exchanged on phone, the receiver recording the message on an identical form and repeating it for confirmation. Form ETR.2. This has 3 parts and is used for exchange of message between TPC and the authorized persons taking shut downs. These messages will usually be conveyed on telephone, the receiver recording the message on an identical form and repeating it for confirmation. Form ETR 3. This has 4 parts and is used when an ‘authorized person’ who has taken a power block has to issue a permit-to-work. Messages in this form will invariable be made out in duplicate and sent to the other party obtaining acknowledgement on the carbon copy. Form ETR 4. This has 3 parts and is used when local blocks are to be arranged. Messages in this form also should invariably be written out and sent to the other party obtaining acknowledgement on the carbon copy. All messages exchange over telephone should be supported with exchange of Private Numbers. Over Head Equipments Page 165  Form ETR-1 Part A …………..RAILWAY POWER BLOCK MESSAGE FOR BLOCKING OF LINES FOR ELECTRIC TRACTION PURPOSES Serial No. Date………….. Time Hr…….Mts……. From, To, Traction Power Controller Section Controller at……… …………….Section ……………..Place Block the following line/s to electric trains/all traffic from Hr……..Mts………on………….. And advise me when this has been done. State below which line/s and between which limits (Sector, Sub-sector, Elementary Section etc.) the block is required. …………………………………………. …………………………………………. The power block is likely to last for ……….Hr…….Mts……….. Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Score out whichever is not applicable. Over Head Equipments Page 166  Form ETR-1 Part B …………..RAILWAY POWER BLOCK MESSAGE FOR BLOCKING OF LINES FOR ELECTRIC TRACTION PURPOSES Serial No. Date………….. Time Hr…….Mts……. From, To, Section Controller ` Power Controller at……… …………(Place) at……………… Your No……………………of…………………….. The following line/s have been blocked to electric trains/all traffic- Line/s Duration ………………..From Hr………………..Mts……….. ………………..to Hr………………..Mts……….. Block on the following line/s cannot be granted for the reasons stated below- Particulars of line/s Reasons …………………………………………. ……………………………………….. ……………………………………… …………………………………………. Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Score out whichever is not applicable. Over Head Equipments Page 167  Form ETR-1 Part C …………..RAILWAY POWER BLOCK MESSAGE FOR BLOCKING OF LINES FOR ELECTRIC TRACTION PURPOSES Serial No. Date………….. Time Hr…….Mts……. From, To, Traction Power Controller Section Controller at……… …………….Section ……………..Place Your No……………………of…………………….. The following lines have been make alive and the block imposed on these line/s may be cancelled- Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Form ETR-1 Part C …………..RAILWAY POWER BLOCK MESSAGE FOR BLOCKING OF LINES FOR ELECTRIC TRACTION PURPOSES Serial No. Date………….. Time Hr…….Mts……. From, To, Traction Power Controller Section Controller at……… …………….Section ……………..Place Your No……………………of…………………….. The following lines have been make alive and the block imposed on these line/s may be cancelled- Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Over Head Equipments Page 168  Form ETR-2 Part A …………..RAILWAY SHUT DOWN NOTICE ON TRACTION OVERHEAD OR OTHER ELECTRICAL EQUIPMENT Serial No. Date………….. Time Hr…….Mts……. From, To, Traction Power Controller …………………. at……… at ……………………. I hereby declare that the following electrical equipment/s has/have been isolated. The equipment shall be earthed according to standing instructions before commencing any work or prior to issue of Permit-to-work:- State below exactly which section/s (Sector, Sub-sector, Elementary Section, etc.) of the electrical equipment has/have been isolated- Lines isolated Limits of isolated ………………………………….. ………………………………………….. ………………………………… …………………………………………… …………………………………. …………………………………………… Line/s to be cleared by Time ……………………Date ………………..Hr……………….Mts………. ……………………Date ………………..Hr……………….Mts………. ……………………Date ………………..Hr……………….Mts………. Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Over Head Equipments Page 169  Form ETR-2 Part B …………..RAILWAY SHUT DOWN NOTICE ON TRACTION OVERHEAD OR OTHER ELECTRICAL EQUIPMENT Serial No. Date………….. Time Hr…….Mts……. From, To, ……………………….. Traction Power Controller at……… at ……………….. Your No……………………of…………………….. Local earths have been applied as the following points:- …………………………………………….line earthed at structure Nos…………….. …………………………………………….line earthed at structure Nos…………….. …………………………………………….line earthed at structure Nos…………….. …………………………………………….line earthed at structure Nos…………….. The following ‘Permits-to-work’ have been issued on this authority and I am responsible for the Permits-to-work:- (1)……………. (2)…………… (3)……………… Permit to work ………………. ……………….. ………………… Nos. Date of Issue ………………. ……………….. ………………… Time of Issue ………………. ……………….. ………………… Dept.Issue to ………………. ……………….. ………………… Person-in-charge of ………………. ……………….. ………………… work Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Over Head Equipments Page 170  Form ETR-2 Part C …………..RAILWAY SHUT DOWN NOTICE ON TRACTION OVERHEAD OR OTHER ELECTRICAL EQUIPMENT Serial No. Date………….. Time Hr…….Mts……. From, To, ……………………….. Traction Power Controller at……… at ……………….. My No…………………………………of……………………………….. I hereby declare that the work on or near electrical equipment/s which has/have been isolated been comp. All men and materials have been withdrawn and the men have been warmed that it is no longer safe to or adjacent to electrical equipments. All Permits-to-work issued by me and have been withdrawn and cancelled. All earths have been removed, and the electrical equipment/s can be made alive. Private No………………………… Sent by……………………………. (Name) Received by ………………………. (Name) Over Head Equipments Page 171  Form ETR-3 Part A …………..RAILWAY PERMIT-TO-WORK ON OR NEAR AC TRACTION ELECTRICAL EQUIPMENT Serial No. Date………….. From, To, ……………………….. ……………… at……… at ……………….. I hereby declare that it safe to work on or near electrical equipment/s which is dead, isolated from live conductors and is connected to earth. State below exactly the electrical equipment on or near to which it is safe to work. (Sector, Sub-sector, Elementary Section, etc.) ……………………………………. ……………………………………. ALL OTHER PARTS ARE DANGEROUS. The equipment shall not be alive until this Permit-to-work is returned duly signed by the person in-charge of the work. The No. of the Permit-to-work, date and time issued has been intimated by me to Traction Power Controller……………………………at……………Hr…………..Mts…………… on.…………(date). Signature………….. (of the authorized person) Name……………. Designation………. Date………Hr…….Mts……. Over Head Equipments Page 172  Form ETR-3 Part B …………..RAILWAY PERMIT-TO-WORK ON OR NEAR AC TRACTION ELECTRICAL EQUIPMENT Serial No. Date………….. From, To, ……………………….. ……………… at……… at ……………….. Received the original foll of this Permit-to-work, I fully understand the portion of the electrical equipment which is dead, isolated and that all other parts are dangerous. The Permit-to-work will be returned by……….Hr………..Mts…………as required. Signature………….. (of the authorized person) Name……………. Designation………. Date………Hr…….Mts……. Form ETR-3 Part C …………..RAILWAY PERMIT-TO-WORK ON OR NEAR AC TRACTION ELECTRICAL EQUIPMENT Serial No. Date………….. From, To, ……………………….. ……………… at……… at ……………….. I hereby declare that the work for which this Permit-to-work was issued has been completed and all men and materials under my charge have been withdrawn the men have been warned that it is no longer safe to work on or near the electrical equipment covered by this Permit-to- work. Signature………….. (of the authorized person) Name……………. Designation………. Date………Hr…….Mts……. Over Head Equipments Page 173  Form ETR-3 Part D …………..RAILWAY PERMIT-TO-WORK ON OR NEAR AC TRACTION ELECTRICAL EQUIPMENT Serial No. Date………….. From, To, ……………………….. ……………… at……… at ……………….. I hereby declare that the Permit-to-work is cancelled and all local earths have been removed. The cancellation of this Permit-to-work has been intimated to Traction Power Controller………..at………..Hr…………Mts……….. Signature………….. (of the authorized person) Name……………. Designation………. Date………Hr…….Mts……. Over Head Equipments Page 174  Form ETR-4 Part A …………..RAILWAY LOCAL BLOCK Serial No. Date………….. Hr…….Mts……. From, To, Name……………………….. Station Master/Yard Master Designation………. The Isolator number at location number Interruptor number at switching station in………………………………..Yard……………………………………….. will be kept open and overhead equipment of elementary Section/s No/s………………………………………will be made dead and earthed. The lines in the above elementary Section/s will not be available for electric stock/all traffic movement…………………….hour until further advice. The block is likely to last for ………………………………Hrs………………….Mts……….. Signature………….. Copy to:- (1) Traction Power Controller (2) Section Controller Form ETR-4 Part B …………..RAILWAY LOCAL BLOCK Serial No. Date………….. ACKNOWLEDGEMENT Received Message No…………………………………..from…………………………. at………………………Hr……………………………….Mts…………………. Signature of Station Master/Yard Master Place…………………………………. Over Head Equipments Page 175  Form ETR-4 Part C …………..RAILWAY LOCAL BLOCK Serial No. Date………….. …….…Hr………Mts………… From, Name…………………….. Station Master/Yard Master Designation……………… …………………………….. No…………………………………of…………………………………….(date) The Interruptor number Isolator number opened by me has been closed and the overhead equipment of the …………………………..elementary Section/s No./s……………………………..have been made alive and are now available for electric stock/all traffic movements. Signature…………….. Copy to:- (1) Traction Power Controller (2) Section Controller Over Head Equipments Page 176