Electrical Code Overview
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Questions and Answers

What types of locations are covered under the scope of this Code?

  • Railway rolling stock and aircraft
  • Industrial plants and transformer stations (correct)
  • Power generation exclusively for rolling stock
  • Automotive vehicles and docks

    • Which of the following is specifically not covered under this Code?

  • Electric generating plants
  • Public buildings
  • Mobile homes
  • Installations in automotive vehicles (correct)

    • Who has the authority to enforce the provisions of this Code?

  • Engineering students
  • Local government officials
  • The Office of the Building Official/EE (correct)
  • Private contractors

    • What principle does the Code emphasize regarding electrical installations?

    <p>Protection against thermal effects and overvoltage</p> Signup and view all the answers

    Which of the following is included in the covered installations of the Code?

    <p>Optical fiber cables</p> Signup and view all the answers

    What does the Board of Electrical Engineering require from professionals concerning the Code?

    <p>Strict adherence to the provisions of the Code</p> Signup and view all the answers

    What types of facilities are explicitly not included in the covered scope?

    <p>Railways for power generation</p> Signup and view all the answers

    Which of the following is a responsibility of the Office of the Building Official/EE?

    <p>Mandating new product requirements</p> Signup and view all the answers

    What is the purpose of a branch-circuit overcurrent protective device?

    <p>To safeguard circuits from overcurrents.</p> Signup and view all the answers

    Which of the following best describes an overload condition in electrical systems?

    <p>When electrical conductors exceed their normal ratings.</p> Signup and view all the answers

    What function does a power outlet serve?

    <p>It supplies power to RVs and temporary equipment.</p> Signup and view all the answers

    What is the role of a plenum in an air distribution system?

    <p>To serve as a chamber connected to air ducts.</p> Signup and view all the answers

    Which of the following defines a qualified person in the context of electrical work?

    <p>An individual with knowledge and skills related to electrical equipment.</p> Signup and view all the answers

    What type of device is supplementary overcurrent protection meant to provide?

    <p>Extra protection for specific equipment.</p> Signup and view all the answers

    What constitutes premises wiring?

    <p>Interior and exterior wiring, power, and control systems.</p> Signup and view all the answers

    What is the primary function of a panelboard?

    <p>To control circuits with overcurrent devices.</p> Signup and view all the answers

    What does a thermal protector in motors primarily prevent?

    <p>Overheating</p> Signup and view all the answers

    Which of the following best describes a switchboard?

    <p>A large panel with switches and instruments</p> Signup and view all the answers

    What does the term 'ungrounded' indicate regarding electrical safety?

    <p>Not connected to ground</p> Signup and view all the answers

    How is a thermally protected motor defined?

    <p>A motor equipped with a thermal protector</p> Signup and view all the answers

    What is the main function of an uninterruptible power supply (UPS)?

    <p>Provide AC power during power failures</p> Signup and view all the answers

    Which term refers to the voltage between conductors in ungrounded circuits?

    <p>Voltage to Ground</p> Signup and view all the answers

    What does the term 'weatherproof' signify in relation to electrical devices?

    <p>Designed to withstand weather exposure</p> Signup and view all the answers

    What characterizes an electronically actuated fuse?

    <p>It interrupts the circuit during overcurrent</p> Signup and view all the answers

    What is included in the plan for lighting and receptacle outlets?

    <p>Lighting circuits and emergency lighting</p> Signup and view all the answers

    Which rating is NOT typically included in the motor loads section of the schedule of loads?

    <p>Operating temperature</p> Signup and view all the answers

    What must be indicated on the one line diagram for electric motors?

    <p>Phase connection for a 1-phase motor</p> Signup and view all the answers

    Which item is essential for the design analysis in electrical specifications?

    <p>Voltage drop calculation</p> Signup and view all the answers

    What is NOT included in the title block of an electrical plan?

    <p>Budget estimation for project</p> Signup and view all the answers

    Which rating is part of the lighting and receptacle loads in a schedule of loads?

    <p>Circuit designation number</p> Signup and view all the answers

    Which of the following is a key requirement for protective devices in electrical specifications?

    <p>Rating of kilovolt-ampere</p> Signup and view all the answers

    What type of diagram is essential for showing size and type of wires for feeders?

    <p>One line diagram</p> Signup and view all the answers

    Which type of load is specifically mentioned in the other loads section of the schedule?

    <p>Phase loading</p> Signup and view all the answers

    What is one of the areas covered under the design analysis?

    <p>Protection coordination</p> Signup and view all the answers

    What is the minimum clear height required for work spaces with exposed energized parts?

    <p>2000 mm</p> Signup and view all the answers

    What is the minimum width required for an entrance to a work space around electric equipment?

    <p>600 mm</p> Signup and view all the answers

    How must personnel doors within 7600 mm of the work space be designed?

    <p>They must open in the direction of egress and have panic hardware.</p> Signup and view all the answers

    What type of access must be provided for safe entry around electric equipment?

    <p>Permanent ladders or stairways</p> Signup and view all the answers

    What is a requirement for high-voltage equipment regarding separation from low-voltage equipment?

    <p>They must be separated by a suitable partition, fence, or screen.</p> Signup and view all the answers

    What is required concerning buildings or enclosures with exposed live parts over 1000 volts?

    <p>They must be locked with access only for those under continuous monitoring.</p> Signup and view all the answers

    What must be maintained regarding unguarded live parts located above working spaces?

    <p>They must be maintained properly.</p> Signup and view all the answers

    What materials are circuit conductors permitted to be installed as?

    <p>Raceways, cable trays, metal-clad cable, bare wire, cable, and busbars.</p> Signup and view all the answers

    Study Notes

    Scope of the Code

    • The code covers electrical installations in various locations, including public and private buildings, industrial plants, transformer stations, substations, airfields, railways, yards, mines, watercraft, trailers, mobile homes, recreational vehicles, and offshore facilities.
    • The code does not cover installations in railway rolling stock, aircraft, or automotive vehicles.
    • The code also does not cover electrical installations for railway power systems for generation, transformation, transmission, or distribution of power used exclusively for the operation of rolling stock.

    Authority and Enforcement

    • The code is approved and adopted by the Board of Electrical Engineering, Professional Regulation Commission, pursuant to Republic Act 7920.
    • The code is enforced by the Office of the Building Official/EE who is responsible for implementing its provisions.
    • The code may require new products, constructions, or materials that are not yet available.

    Definitions

    • Outlet: A point in the wiring system where current is supplied to utilization equipment.
    • Outline Lighting: Uses lamps or other light sources to highlight or emphasize features like a building's shape or window decorations.
    • Overcurrent: Any current exceeding the equipment's rated current or conductor's ampacity, caused by overload, short circuit, or ground fault.
    • Branch-circuit Overcurrent Protective Device: Safeguards circuits from overcurrents, with an interrupting rating of at least 5000 amperes. Examples include circuit breakers, ground fault circuit interrupters (GFCIs), and arc fault circuit interrupters (AFCIs).
    • Supplementary Overcurrent Protective Device: Offers extra protection for specific equipment, in addition to branch-circuit protection. Examples include fuses.
    • Overload: Occurs when equipment or conductors exceed their normal ratings, risking damage or overheating.
    • Panelboard: A panel with buses and overcurrent devices for controlling circuits, mounted in a cabinet.
    • Photovoltaic (PV) system: Converts solar energy into electric energy for use with a load.
    • Plenum: A chamber connected to air ducts that is part of an air distribution system.
    • Portable Equipment: Has electrical components that can be moved by a single person without mechanical aids.
    • Power Outlet: Supplies and controls power to mobile homes, RVs, park trailers, boats, or temporary equipment, and includes components like receptacles and circuit breakers.
    • Premises Wiring: Includes all interior and exterior wiring for power, lighting, control, and signals, along with associated hardware, from the power source to the outlets.
    • Qualified Person: Has the skills and knowledge related to electrical equipment and installations and has received safety training to recognize and avoid associated hazards.
    • Raceway: An enclosed channel, made of metallic or nonmetallic materials, designed to hold wires, cables, or busbars.
    • Switch, Transfer: A device that transfers load connections between power sources.
    • Switchboard: A large panel with switches, protective devices, and instruments, accessible from both front and back.
    • Switchgear: A sheet-metal-enclosed assembly containing power circuit devices and connections, with access through doors or covers.
    • Thermal Protector (Motors): A device integrated into a motor to prevent overheating.
    • Thermally Protected (Motors): Indicates a motor is equipped with a thermal protector.
    • Ungrounded: Not connected to ground or a conductive body extending the ground connection.
    • Uninterruptible Power Supply (UPS): Provides AC power during a power failure.
    • Utilization Equipment: Devices that use electrical energy for various purposes.
    • Ventilated: Designed to allow air circulation to remove heat, fumes, or vapors.
    • Volatile Flammable Liquid: A flammable liquid with a flash point below 38°C or one above its flash point.
    • Voltage (of a Circuit): The highest effective potential difference between any two conductors in the circuit.
    • Voltage, Nominal: The assigned voltage value for a circuit, with actual voltage varying within a range for proper operation.
    • Voltage to Ground: Voltage between a conductor and the ground point, or the greatest voltage between conductors in ungrounded circuits.
    • Watertight: Built to prevent moisture entry under specific conditions.
    • Weatherproof: Designed to withstand exposure to weather without affecting operation.
    • Electronically Actuated Fuse: An overcurrent protective device with a control module that senses current, derives time-current characteristics, and interrupts the circuit during overcurrent. It may or may not limit current.
    • Fuse: A protective device that opens a circuit by severing a fusible part when overcurrent passes through it.

    Electrical Plans

    Electrical layouts for power, lighting and receptacle outlets, fire alarm circuits, and a schedule of loads are necessary.

    Power Layout Plan

    • Service and distribution
    • Electrical circuits
    • Emergency power (if applicable)
    • Room usage

    Lighting and Receptacle Outlets Plan

    • Lighting fixtures
    • Switch locations
    • Receptacles and appliances
    • Lighting circuits
    • Emergency lighting
    • Receptacle layout

    Fire Alarm Circuits Plan

    • Equipment locations
    • Circuit details

    Schedule of Loads

    • Motor Loads
      • Motor identification number
      • Type of motor
      • Horsepower/kilowatt/kilovolt-ampere rating
      • Voltage rating
      • Full-load current rating
      • Frequency rating other than 60 hertz
      • Number of phases
      • Type and size of wiring
      • Protective device rating
    • Lighting and Receptacle Loads
      • Panel number from feeder diagram
      • Number of receptacle outlets
      • Number of lighting outlets in each circuit
      • Number of switches in each circuit
      • Circuit designation number
      • Voltage of circuit
      • Type and size of wiring
      • Protective device rating
    • Other Loads
      • Phase loading indicating full load line current
      • Classification of service duty, if required
      • Rating of kilovolt-ampere or kilowatt
      • Designation number on plan
      • Description of load
      • Voltage rating
      • Type and size of wiring
      • Protective device rating

    Design Analysis

    • Electrical Distribution
    • Protective Devices
    • Voltage Drop Calculation
    • Short Circuit Current Calculation
    • Protection Coordination
    • Arc-Flash Hazard Analysis

    One Line Diagram

    • Lighting and Receptacle Outlet Loads
      • Single line or schematics diagram
      • Size of conductors
    • Motor Loads
      • Full load current
      • Locked rotor current
      • Rated voltage
      • Type and size of wiring, indicating load in amperes
      • Electric motors shall be numbered consecutively to correspond to their numbers in the layout
      • Rating in kilowatts/horsepower/kilovolt ampere
      • Phase connection for 1-phase motor on a 3-phase system
    • Feeders and Subfeeders
      • Labeling of feeders and subfeeders
      • Size and type of wires and raceway
      • Protective devices and controls
      • Allowable ampacity of the conductor
    • Load Center
      • Labeling of load center
      • Incoming and outgoing feeders, type, size and voltage
      • Equipment grounding

    Title Block

    • Name and location of installation or project
    • Name, signature and address of owner/manager/ operator
    • Title of sheet
    • Name, signature and seal of Professional Electrical Engineer, together with PRC license number and validity, Professional Tax Receipt (PTR) Number, and Tax Identification Number (TIN)
    • Scale used, date drawn, and sheet number

    Requirements for Electrical Installations

    • Entrance and Access to Work Space:

      • At least one entrance not less than 600 mm wide and 2000 mm high is required for working space around electrical equipment.
      • Large equipment exceeding 1800 mm in width needs an entrance at each end.
      • Bare energized parts at any voltage, or insulated energized parts above 1000 volts, located near an entrance must be suitably guarded.
      • Doors within 7600 mm of the working space must open in the direction of egress and be equipped with listed panic hardware.
      • Permanent ladders or stairways are required for safe access to working spaces around electrical equipment.

    • Work Space and Guarding:

      • A clear working space shall be provided according to the Code.
      • High-voltage equipment (over 1000 volts) must be separated from low-voltage equipment (1000 volts or less) by a suitable partition, fence, or screen.
      • Buildings or enclosures with exposed live parts over 1000 volts must be locked, with access only under continuous monitoring by a licensed electrical practitioner.
      • Illumination must be provided for all working spaces around electrical equipment.
      • Unguarded live parts above working space shall be maintained.
      • Protection of service equipment, switchgear, and industrial control assemblies: Pipes or ducts unrelated to the electrical system should not be near electrical equipment. Protection is needed against leaks, except for fire protection pipes.

    • Circuit Conductors: Circuit conductors may be installed in raceways, cable trays, or as metal-clad cable, bare wire, cable, or busbars.

    • Minimum Work Space: Where energized parts are exposed, the minimum clear work space shall not be less than 2000 mm high.

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    Philippine Electrical Code Part 1: Chapter 1 PDF

    Description

    This quiz explores the scope and enforcement of electrical installations governed by the code approved by the Board of Electrical Engineering. It highlights various applications and limitations, as well as the roles of authorities responsible for implementation. Test your understanding of the provisions and context surrounding these regulations.

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