PEC 2009 - Electrical Installation Rules PDF

PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) The P.E.C. 2009 consists of two (2) parts:  PART I  Volume 1 - Consists of rules which regulate electrical installation done ―inside‖ the building.  Volume 2 - Con...

PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) The P.E.C. 2009 consists of two (2) parts:  PART I  Volume 1 - Consists of rules which regulate electrical installation done ―inside‖ the building.  Volume 2 - Consists of rules which regulate electrical installation applied to ―watercraft‖.  PART II - Consists of rules which regulate electrical installation done ―outside‖ the building. CHAPTER 1 - GENERAL Purpose of P.E.C. 2009: 1. Practical Safeguarding 2. Adequacy - This Code contains provisions that are considered minimum requirements necessary for safety. Compliance therewith and proper maintenance will result in an installation that is essentially free from hazard but not necessarily efficient, convenient, or adequate for good service or future expansion. 3. Intention - This Code is intended for the exclusive use of licensed electrical practitioners (PEE, REE, and RME). This Code is not intended as a design specification nor an instruction manual for a non-licensed electrical practitioner, unless under the supervision of a licensed electrical practitioner. 4. Relation to Other International Standards - The requirements in this Code address the fundamental principles of protection for safety contained in Section 131 of International Electrotechnical Commission Standard 60364-1, Electrical Installations of Buildings. Mandatory Rules, Permissive Rules, & Explanatory Material: 1. Mandatory Rules - Mandatory rules of this Code are those that identify actions that are specifically required or prohibited and are characterized by the use of the terms “shall” or “shall not”. 2. Permissive Rules - Permissive rules of this Code are those that identify actions that are allowed but not required, are normally used to describe options or alternative methods, and are characterized by the use of the terms “shall be permitted” or “shall not be required”. 3. Explanatory Material - Explanatory material, such as references to other standards, references to related sections of this Code, or information related to a Code rule, is included in this Code in the form of fine print notes (FPN). (FPN) are informational only and are not enforceable as requirements of this Code. Coverage or Scope of PEC 2009 Covered-The installation of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and optical fiber cables and raceways installed. 1. Public and private buildings, including but not limited to residential, commercial, industrial, institutional, cultural, agricultural, agro-industrial, planned unit development and all other buildings or premises that may require practical safeguarding of persons and property from hazards arising from the use of electricity. 2. Electric generating plants 9. Quarries and mines 3. Industrial plants 10. Watercraft 4. Transformer stations 11. Dockyards 5. Permanent and temporary substations, etc. 12. Trailers 6. Airfields 13. Mobile homes and recreational vehicles 7. Railways switchyards 14. Offshore facilities 8. Yards, carnival, parks, parking and other lots Not Covered - The following installations are not covered: 1. Railway rolling stock, aircraft, or automotive vehicles 2. Railways for generation, transformation, transmission, or distribution of power used exclusively for operation of rolling stock. 1 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 6 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) DEFINITIONS Accessible (as applied to equipment) - Admitting close approach; not guarded by locked doors, elevation, or other effective means. Accessible (as applied to wiring methods) - Capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building. Accessible, Readily (Readily Accessible) - Capable of being reached quickly for operation, renewal, or inspections without requiring those to whom ready access is requisite to climb over or remove obstacles or to resort to portable ladders, and so forth. Ampacity - The current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Appliance - Utilization equipment, generally other than industrial, that is normally built in standardized sizes or types and is installed or connected as a unit to perform one or more functions such as clothes washing, air conditioning, food mixing, deep frying, and so forth. Approved - Acceptable to the authority having jurisdiction. Askarel - A generic term for a group of nonflammable synthetic chlorinated hydrocarbons used as electrical insulating media. Askarels of various compositional types are used. Under arcing conditions, the gases produced, while consisting predominantly of noncombustible hydrogen chloride, can include varying amounts of combustible gases, depending on the askarel type. Attachment Plug (Plug Cap) (Plug) - A device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle. Authority Having Jurisdiction (AHJ) - The organization, office, or individual responsible for approving equipment, materials, an installation, or a procedure. Automatic - Self-acting, operating by its own mechanism when actuated by some impersonal influence, as, for example, a change in current, pressure, temperature, or mechanical configuration. Bonding (Bonded) - The permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed. Bonding Jumper - A reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected. Branch Circuit - a set of conductors that extends beyond the last overcurrent device protecting the circuit and the outlet(s). Circuit Breaker - A device designed to open and close a circuit by non-automatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating. Adjustable - Indicating that the circuit breaker can be set to trip at various values of current, time, or both, within a predetermined range. Instantaneous Trip - No delay is purposely introduced in the tripping action of the circuit breaker. Inverse Time - There is purposely introduced a delay in the tripping action of the circuit breaker, which delay decreases as the magnitude of the current increases. Nonadjustable - It does not have any adjustment to alter the value of current at which it will trip or the time required for its operation. Setting - The value of current, time, or both, at which an adjustable circuit breaker is set to trip. Concealed - Rendered inaccessible by the structure or finish of the building. Wires in concealed raceways are considered concealed, even though they may become accessible by withdrawing them. Conductor, Bare - A conductor having no covering or electrical insulation whatsoever. 2 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 7 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) Conduit Body - A separate portion of a conduit or tubing system that provides access through a removable cover(s) to the interior of the system at a junction of two or more sections of the system or at a terminal point of the system. Boxes such as FS and FD or larger cast or sheet metal boxes are not included. Connector, Pressure (Solderless) - A device that establishes a connection between two or more conductors or between one or more conductors and a terminal by means of mechanical pressure and without the use of solder. Continuous Load - A load where the maximum current is expected to continue for 3 hours or more. Controller - A device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected. Copper-Clad Aluminum Conductors - Conductors drawn from a copper-clad aluminum rod with the copper metallurgically bonded to an aluminum core. The copper forms a minimum of 10 percent of the cross- sectional area of a solid conductor or each strand of a stranded conductor. Cutout Box - An enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the box proper. Dead Front - Without live parts exposed to a person on the operating side of the equipment. Demand Factor - The ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or the part of the system under consideration. Disconnecting Means - A device, or group of devices, or other means by which the conductors of a circuit can be disconnected from their source of supply. Dusttight - Constructed so that dust will not enter the enclosing case under specified test conditions. Duty, Continuous - Operation at a substantially constant load for an indefinitely long time. Duty, Intermittent - Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest. Duty, Periodic - Intermittent operation in which the load conditions are regularly recurrent. Duty, Short-Time - Operation at a substantially constant load for a short and definite, specified time. Duty, Varying - Operation at loads, and for intervals of time, may be subject to wide variation. Enclosed - Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts. Enclosure - The case or housing of apparatus, or the fence or walls surrounding an installation to prevent personnel from accidentally contacting energized parts or to protect the equipment from physical damage. Energized - Electrically connected to a source of voltage. Exposed (as applied to live parts) - Capable of being inadvertently touched or approached nearer than a safe distance by a person. It is applied to parts that are not suitably guarded, isolated, or insulated. Exposed (as applied to wiring methods) - On or attached to the surface or behind panels designed to allow access. Feeder - All circuit conductors between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device. Festoon Lighting - A string of outdoor lights that is suspended between two points. Fitting - An accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a mechanical rather than an electrical function. Ground-Fault Circuit Interrupter (GFCI) - A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device. Grounding Conductor - A conductor used to connect equipment or the grounded circuit of a wiring system to a grounding electrode or electrodes. 3 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 8 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) Grounding Conductor, Equipment - The conductor used to connect the non-current-carrying metal parts of equipment, raceways, and other enclosures to the system grounded conductor, the grounding electrode conductor, or both, at the service equipment or at the source of a separately derived system. Grounding Electrode - A device that establishes an electrical connection to the earth. Grounding Electrode Conductor - The conductor used to connect the grounding electrode(s) to the equipment grounding conductor, to the grounded conductor, or to both, at the service, at each building or structure where supplied by a feeder(s) or branch circuit(s), or at the source of a separately derived system. Guarded- Covered, shielded, fenced, enclosed, or otherwise protected by means of suitable covers, casings, barriers, rails, screens, mats, or platforms to remove the likelihood of approach or contact by persons or objects to a point of danger. Handhole Enclosure - An enclosure identified for use in underground systems, provided with an open or closed bottom, and sized to allow personnel to reach into, but not enter, for the purpose of installing, operating, or maintaining equipment or wiring or both. Hoistway - Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate. In Sight From (Within Sight From, Within Sight) - Where this Code specifies that one equipment shall be ―in sight from,‖ ―within sight from,‖ or ―within sight,‖ and so forth, of another equipment, the specified equipment is to be visible and not more than 15 m (50 ft) distant from the other. Interrupting Rating - The highest current at rated voltage that a device is intended to interrupt under standard test conditions. Live Parts - Conductor or conductive part intended to be energized in normal use. Location, Damp - Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses. Location, Dry - A location not normally subject to dampness or wetness. A location classified as dry may be temporarily subject to dampness or wetness, as in the case of a building under construction. Location, Wet - Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather. Luminaire - A complete lighting unit consisting of a lamp or lamps together with the parts designed to distribute the light, to position and protect the lamps and ballast (where applicable), and to connect the lamps to the power supply. Multioutlet Assembly - A type of surface, flush, or freestanding raceway designed to hold conductors and receptacles, assembled in the field or at the factory. Non-automatic - Action requiring personal intervention for its control. As applied to an electric controller, non-automatic control does not necessarily imply a manual controller, but only that personal intervention is necessary. Outlet - A point on the wiring system at which current is taken to supply utilization equipment. Overcurrent - Any current in excess of the rated current of equipment or the ampacity of a conductor. It may result from overload, short circuit, or ground fault. Overload - Operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating. A fault, such as a short circuit or ground fault, is not an overload. 4 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 9 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) Panelboard - A single panel or group of panel units designed for assembly in the form of a single panel, including buses and automatic overcurrent devices, and equipped with or without switches for the control of light, heat, or power circuits; designed to be placed in a cabinet or cutout box placed in or against a wall, partition, or other support; and accessible only from the front. Plenum - A compartment or chamber to which one or more air ducts are connected and that forms part of the air distribution system. Power Outlet - An enclosed assembly that may include receptacles, circuit breakers, fuse holders, fused switches, buses, and watt-hour meter mounting means; intended to supply and control power to mobile homes, recreational vehicles, park trailers, or boats or to serve as a means for distributing power required to operate mobile or temporarily installed equipment. Raceway - An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code. Raceways include, but are not limited to, RMC, RNMC, IMC, LFC, FMT, FMC, ENMT, EMT, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways. Rainproof - Constructed, protected, or treated so as to prevent rain from interfering with the successful operation of the apparatus under specified test conditions. Raintight - Constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions. Receptacle - A receptacle is a contact device installed at the outlet for the connection of an attachment plug. A single receptacle is a single contact device with no other contact device on the same yoke. A multiple receptacle is two or more contact devices on the same yoke. Receptacle Outlet - An outlet where one or more receptacles are installed. Service - The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served. Service Cable - Service conductors made up in the form of a cable. Service Conductors - The conductors from the service point to the service disconnecting means. Service Drop - The overhead service conductors from the last pole or other aerial support to and including the splices, if any, connecting to the service-entrance conductors at the building or other structure. Service-Entrance Conductors, Overhead System - The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop. Service-Entrance Conductors, Underground System - The service conductors between the terminals of the service equipment and the point of connection to the service lateral. Service Equipment - The necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply. Service Lateral - The underground service conductors between the street main, including any risers at a pole or other structure or from transformers, and the first point of connection to the service-entrance conductors in a terminal box or meter or other enclosure, inside or outside the building wall. Where there is no terminal box, meter, or other enclosure, the point of connection is considered to be the point of entrance of the service conductors into the building. Service Point - The point of connection between the facilities of the serving utility and the premises wiring. Show Window - Any window used or designed to be used for the display of goods or advertising material, whether it is fully or partly enclosed or entirely open at the rear and whether or not it has a platform raised higher than the street floor level. Signaling Circuit - Any electric circuit that energizes signaling equipment. 5 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 10 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) Switch, Transfer - An automatic or non-automatic device for transferring one or more load conductor connections from one power source to another. Switchboard - A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets Thermal Protector (as applied to motors) - A protective device for assembly as an integral part of a motor or motor-compressor that, when properly applied, protects the motor against dangerous overheating due to overload and failure to start. Utilization Equipment - Equipment that utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. Volatile Flammable Liquid - A flammable liquid having a flash point below 38°C, or a flammable liquid whose temperature is above its flash point, or a Class II combustible liquid that has a vapor pressure not exceeding 276 kPa at 38°C and whose temperature is above its flash point. Voltage (of a circuit) - The greatest root-mean-square (RMS/effective) difference of potential between any two conductors of the circuit concerned. Voltage, Nominal - A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts, 480Y/277 volts, 600 volts). The actual voltage at which a circuit operates can vary from the nominal within a range that permits satisfactory operation of equipment. Voltage to Ground - For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit. Watertight - Constructed so that moisture will not enter the enclosure under specified test conditions. Weatherproof - Constructed or protected so that exposure to the weather will not interfere with successful operation PERMITS AND INSPECTION CERTIFICATES Places to Obtain Permits:  Local Building Office - buildings, trailers, mobiles homes  Marina(Maritime Industry Authority) - watercrafts Requirements for Electrical Permit: a) Information 1. Applicant 2. PEE who signed and sealed the electrical plans and specifications 3. Licensed Electrical Practitioner who is in charge of electrical works 4. Building Owner 5. Lot Owner 6. Building Official b) 5 SETS of complete electrical plans and specifications signed and sealed by PEE The delay for releasing an electrical permit shall not be longer than five (5) working days after which time application together with the accompanying plans Reconnection of Disconnected Service - If service has been cut off for more than 1 year, electrical inspection cert. is required. 6 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 11 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) ELECTRICAL PLANS AND SPECIFICATIONS Drawing Sheet Sizes - Electrical plans and drawings shall be drawn on drawing sheets of the following standard sizes:  760 mm x 1,000 mm  600 mm x 900 mm  500 mm x 760 mm * For dwelling units 297 mm x 420mm (A3 Size is allowed) Plan Requirements: a) Location and Site Plans - Proposed structure and owner’s land drawn with the ff. information: 1. Bordering areas showing public or well-known streets, landmarks and/or structures. 2. Location of service drop, service equipment and nearest pole of the utility company furnishing electrical energy. 3. Location of the meter; Sizes of service entrance wires, conduits and service equipment. 4. Clearance of the path or run of service drop and entrance wires to adjacent and/ or proposed structures. b) Legend or Symbols c) General Notes and/or Specifications 1. Nature of electrical service, number of phases, number of wires, voltage and frequency. 2. Type of wiring  Service entrance  Feeders, sub-feeders and branch circuit wires for lighting and/or power load.  Fire alarm system (if required)  Signaling and communication 3. Special equipment to be installed, with ratings, classification of service or duty cycle. 4. System or method of grounding. 5. Type and rating of main disconnecting means, overcurrent protection (OCP) and branch circuit wiring. 6. Clearances of service drop, burial depth for service lateral, mounting height and clearance for service equipment, mounting height and clearance for kWh meter. d) Electrical Layout 1. Plan for Power  Sizes and location of service entrance conductors, raceways, metering equipment, main switchboard, layout of feeders and distribution panels or switches and their sizes, types and ratings.  Complete circuits of motors and other electrical equipment, their controlling devices, their locations and ratings.  Complete wiring of emergency power system (if any).  Nature of processes/activities carried out in each room or area. 2. Plan for Lighting and Receptacle Outlets  Location, type and rating of lighting fixtures, indicating illumination in lux in each room or area. In residences, hotels, apartment houses, and churches, the illumination level in each room or area need not be shown nor computed.  Location of switches for each fixtures or group of fixtures.  Location of receptacle outlets and appliances to be served and their ratings.  Complete circuits of the lighting and receptacle outlets.  Complete wiring of emergency lighting system (if any).  A separate drawing showing layout of receptacle outlets may be made at the discretion of the design engineer. 7 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 12 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) 3. Plan for Fire Alarm Circuits - Layout and wiring plans of fire alarm station, fire alarm bell, and fire alarm control panel. e) Schedule of Loads 1. Motor Loads 2. Lighting and Receptacle Loads 3. Other Loads f) Design Analysis 1. Branch circuits, sub-feeders, feeders, busways, and service entrance 2. Types, ratings, and trip setting of overload protective devices 3. Short circuit current for interrupting capacity 4. Voltage drop calculations g) One Line Diagram 1. Lighting and Receptacle Outlet Loads 2. Motor Loads 3. Feeders and Subfeeders 4. Load Centers Title Block or Nameplate of Plans and Drawing - Shall be made of standard strip 40mm high at the bottom of the sheet. 1. Name and location of installation of project. 2. Name, signature and address of owner/ manager/ operator 3. Title of sheet 4. PEE name and signature with PRC license number, Tax Identification number. 5. Scale used, date drawn 6. Sheet number Other Details for Electrical Plans 1. Exposed conductors  Means of support and types of insulators  Spacings and clearances 2. Auxiliary gutters, wireways, busways, cabinets, boxes, metallic raceways, underground installations.  Installation details  Conductor supports, separators, and attachments 3. Private pole installations  Construction and installation details and dimensions  Pole top wiring details including line hardware  Guying detail 4. Low energy power and low voltage power installation  Details of battery installation and source of power  Equipment, wiring, actuating mechanism and protective devices Substation Plans and Specifications Indoor Substation 1. Location and dimensions of: a) Substation in building plan drawn to scale b) Building with respect to entire compound or property c) Incoming and outgoing lines d) Windows, doors, and other openings 8 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 13 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) 2. Substation structural requirements: a) Materials & construction of walls, floors, roof, windows, enclosures, doors (with dimensions b) Ventilation and drainage systems and other safeguards 3. Substation electrical requirements a) Plan view showing location and size of equipment installed b) Clearances and spacings between exposed current-carrying and non-current carrying portions c) Grounding system 4. Cross sectional views a) Horizontal and vertical clearances between exposed parts b) Horizontal and vertical clearances of exposed parts from floor/ceiling c) Finished floor level and ground level 5. Miscellaneous a) Specification of equipment b) Wiring of lighting and remote control systems c) One-line diagrams of entire installation with voltage indicated d) Computations on size of wires, busbar, transformer, fuses, switches and breaker e) Class of insulation or insulators Outdoor Substation - Outdoor substation plans shall show same items as indoor substation except that in lieu of walls and roof, details of fence and supporting steel structure. REQUIREMENTS FOR ELECTRICAL INSTALLATIONS The Criteria for Examination of Electrical Inspection: 1. Suitability for the installation 2. Mechanical strength and durability 3. Wire bending and connection space 4. Electrical insulation 5. Heating effects produced by the equipment under normal and abnormal condition of use. 6. Arcing effects 7. Class, type, size, voltage, ampacity, specific use of equipment. Entrance to Working Space a) Large equipment - equipments rated 1200 amperes or more shall have at least one entrance.  600 mm wide  2000 mm high b) Headroom - The minimum headroom of working spaces about service equipment, switchboards, panelboards, or motor control centers shall be 2000 mm. 9 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 14 of 106  PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) Warning Sign for Voltages Exceeding 600 Volts ―DANGER - HIGH VOLTAGE - KEEP OUT‖ Measurements for Access to Manholes a) Rectangular access openings (650 mm x 550mm) b) Round access openings (650 mm diameter) 10 | PEC Reviewer - Property of Andryn Jill Dumbrique Beltran (REE) COPYRIGHT 2014 ANDRYN JILL D. BELTRAN, REE, VIGAN ILOCOS SUR, [email protected] Page 15 of 106