Philippine Electrical Code Overview
40 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the acceptable methods for protecting service entrance conductors from physical damage?

  • By wooden casing
  • By IMC (correct)
  • By RMC (correct)
  • By non-metallic conduits

    • What is the maximum number of switches or circuit breakers allowed in a single enclosure for service disconnecting means?

  • Six (correct)
  • Ten
  • Eight
  • Four

    • Where should the service disconnecting means be installed?

  • In the basement only
  • Only outside the building
  • At a readily accessible location nearest the service entrance (correct)
  • In a locked cabinet

    • What is the minimum rating required for a service disconnecting means in a one-circuit installation?

    <p>15 amperes</p> Signup and view all the answers

    For a one-family dwelling, what rating is required for the service disconnecting means if the initial computed load is 10 kVA or more?

    <p>60 amperes</p> Signup and view all the answers

    Which of the following statements about circuit breakers is true?

    <p>They shall have an interrupting rating not less than the maximum available short-circuit current.</p> Signup and view all the answers

    What amount of amperage is required for the service disconnecting means in two circuit installations?

    <p>30 amperes</p> Signup and view all the answers

    In large installations, how is the feeder distribution typically arranged?

    <p>One feeder for each floor</p> Signup and view all the answers

    What is the primary purpose of overcurrent protection as outlined in the PEC?

    <p>To protect electrical circuits and equipment from damage due to overcurrent</p> Signup and view all the answers

    Which of the following is NOT a focus of the Philippine Electrical Code?

    <p>Promotion of renewable energy use</p> Signup and view all the answers

    What are mandatory rules in the context of the PEC?

    <p>Rules that must be followed as they use the word 'SHALL'</p> Signup and view all the answers

    What is a critical feature of emergency systems as specified in the PEC?

    <p>They ensure functionality of critical facilities during power outages</p> Signup and view all the answers

    How does the PEC address special installations such as swimming pools?

    <p>It has specific regulations to ensure their safe operation</p> Signup and view all the answers

    What is the significance of regular inspections and maintenance according to the PEC?

    <p>They ensure electrical systems remain in safe working condition over time</p> Signup and view all the answers

    What does strict compliance with the provisions of the PEC guarantee?

    <p>Safety in electrical installation and construction</p> Signup and view all the answers

    Which statement accurately reflects the updates made to the PEC?

    <p>Updates integrate new technologies and safety standards periodically</p> Signup and view all the answers

    Which of the following is NOT included in the schedule of motor loads?

    <p>Number of switches in each circuit</p> Signup and view all the answers

    What is the primary purpose of grounding a circuit?

    <p>To permanently fix a zero voltage point</p> Signup and view all the answers

    Which of the following is part of the design computation required for illuminating designs?

    <p>Tabulated lighting levels in lux for critical areas</p> Signup and view all the answers

    What elements must be indicated for lighting and power loads in the schedule?

    <p>Voltage circuit</p> Signup and view all the answers

    Where should the panelboard be installed for accessibility?

    <p>In or against a wall accessible only from the front</p> Signup and view all the answers

    Which type of connection is suitable for establishing grounding according to the guidelines?

    <p>Connection to a rod or group of rods</p> Signup and view all the answers

    Which factor is NOT considered in the sizing of branch circuit wires?

    <p>Designation number on plan</p> Signup and view all the answers

    Which of these ratings is crucial for determining the safety of circuit protective devices?

    <p>Fuse or trip rating</p> Signup and view all the answers

    What defines a Class I, Division 2 location?

    <p>Locations confining flammable liquids, vapors, or gases in closed systems with potential for accidental release.</p> Signup and view all the answers

    Which scenario best describes a Class II, Division 1 location?

    <p>An area where combustible dust is consistently in the air in hazardous quantities.</p> Signup and view all the answers

    How does a Class II, Division 2 location differ from a Division 1 location?

    <p>Dust accumulations are normally insufficient to interfere with electrical equipment operation.</p> Signup and view all the answers

    Which characteristic is typical for a Class I, Division 2 location regarding gas concentrations?

    <p>Positive mechanical ventilation typically prevents ignitible concentrations.</p> Signup and view all the answers

    What is a potential risk in Class II, Division 2 locations?

    <p>Electrical equipment that cannot safely dissipate heat.</p> Signup and view all the answers

    What defines the boundaries of a Class I, Division 2 location?

    <p>Proximity to Class I, Division 1 locations without adequate ventilation safeguards.</p> Signup and view all the answers

    What could cause a Class II, Division 1 location to produce ignitible mixtures?

    <p>Abnormal operations of machinery or equipment.</p> Signup and view all the answers

    In a Class I, Division 2 location, what is the main preventive measure against hazards?

    <p>Use of closed containers to hold flammable materials.</p> Signup and view all the answers

    What is the main purpose of installing the panelboard near the load center?

    <p>To reduce the length of home wiring runs</p> Signup and view all the answers

    Which statement accurately describes a branch circuit?

    <p>It refers to the conductors between the circuit protection device and the outlets</p> Signup and view all the answers

    What is considered overcurrent in an electrical circuit?

    <p>Current exceeding the rated current capacity of the load equipment</p> Signup and view all the answers

    Which of the following statements highlights an advantage of circuit breakers over fuses?

    <p>Circuit breakers can be reset after tripping without replacement</p> Signup and view all the answers

    What is the primary characteristic of ampacity?

    <p>The current-carrying capacity of an electric conductor</p> Signup and view all the answers

    Which situation is NOT a cause of overcurrent?

    <p>A normal operating condition of the circuit</p> Signup and view all the answers

    What feature distinguishes a fuse from a circuit breaker?

    <p>Fuses open the circuit with a fusible element during overcurrent</p> Signup and view all the answers

    Which of the following describes one of the advantages of using a fuse?

    <p>Fuses can remain functional for long periods without maintenance</p> Signup and view all the answers

    Study Notes

    Philippine Electrical Code (PEC)

    • Establishes safety standards for electrical systems and equipment
    • Mandated by R.A. 7920 (formerly R.A. 184), the New Electrical Engineering Law
    • Covers electrical installations inside and outside buildings
    • Includes mandatory and advisory rules
    • Aims to ensure safe use of electricity and adequate electrical installations

    Protection of Electrical Circuits

    • Overcurrent protection: protects circuits and equipment from overcurrent conditions
    • Wiring protection: protects wiring from physical damage, moisture, and environmental factors
    • Hazardous locations: provides guidelines for installing electrical systems in areas with flammable materials
    • Emergency systems: outlines requirements for emergency power systems and backup generators
    • Special installations: establishes specific regulations for pools, elevators, and renewable energy systems
    • Inspections and Maintenance: emphasizes the importance of periodic inspections and maintenance

    Service Entrance Conductors

    • Protected from physical damage by:
      • RMC (Rigid Metal Conduit)
      • IMC (Intermediate Metal Conduit)
      • RNMC (Reinforced Non-Metallic Conduit)
      • EMT (Electrical Metallic Tubing)
      • Type MC cable
      • Other approved means

    Service Equipment - Disconnecting Means

    • General: Disconnects all conductors in a building from the service-entrance conductors.
    • Number of Disconnecting Means: Not more than six switches or six circuit breakers per set or subset of service entrance conductor.
    • Location: Readily accessible location, inside or outside the building, nearest the entrance of the service entrance conductor.
    • Rating: Not less than the load to be carried, with specific minimum ratings based on the number of circuits:
      • One circuit: minimum of 15 amperes
      • Two circuits: minimum of 30 amperes
      • One family dwelling:
        • 60 amperes for initial computed loads of 10 kVA or more
        • 100 amperes for initial installations of six or more 2-wire branch circuits
      • Other installations: minimum of 40 amperes

    Feeders and Mains

    • Large installations: One feeder per floor
    • Schedule of Loads and Computations: Tabulated form indicating load details for:
      • Motor loads: Motor number, type, HP/kW/kVA rating, voltage, current, frequency, and number of phases
      • Lighting and Power Loads: Panel number, circuit designation, number of outlets, switches, convenience outlets, voltage circuit, and fuse/trip rating
      • Other Loads: Load designation, description, service duty, rating (kVA or kW), phase loading, and voltage rating

    Grounding Protection

    • Provides a zero voltage point in the system
    • Grounded line should not be broken or fused
    • Methods of grounding:
      • Connection to a buried cold water main
      • Connection to a rod or group of rods
      • Connection to a buried ground plate

    Panelboard

    • Single panel or group of units with buses, overcurrent protective devices, switches for control of light, heat, or power circuits
    • Installed in a cabinet or cutout box
    • Principles of installation:
      • Accessible and convenient approach
      • Centrally located to shorten wiring runs
      • Installed near the load center (often near the kitchen and laundry)

    Branch Circuit

    • Wiring between the final overcurrent device protecting the circuit and the outlets
    • Common practice includes outlet receptacles and other wiring devices within the definition

    Overcurrent Protection

    • Any current exceeding the rated capacity of equipment or conductors is called overcurrent
    • Causes:
      • Overload in equipment conductors
      • Short circuits or ground faults
    • Conductors must be protected against overcurrent based on ampacity

    Circuit Breaker and Fuse

    • Circuit Breaker: Overcurrent protective device that also functions as a switch
    • Fuse: Overcurrent protective device with a fusible element that opens when there is an overcurrent
    • Advantages of circuit breaker over fuse:
      • Acts as a switch
      • Trips automatically and can be reset after correcting the fault
    • Advantages of fuse over circuit breaker:
      • Reliable and stable
      • Requires less maintenance

    Hazardous Locations

    • Class I Locations: Hazardous due to flammable liquids, gases, or vapors
      • Division 1: Ignitible concentrations of gases or vapors normally present
      • Division 2: Ignitible concentrations of gases or vapors can be present due to accidental rupture or malfunctions
    • Class II Locations: Hazardous due to combustible dust
      • Division 1: Combustible dust normally present in air in quantities sufficient to produce explosive mixtures
      • Division 2: Combustible dust not normally present in air, but can be suspended due to malfunctions
    • Class III Locations: Hazardous due to combustible fibers or materials

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Philippine Electrical Code Summary 2009 PDF

    Description

    This quiz covers the essentials of the Philippine Electrical Code (PEC), which establishes safety standards for electrical systems and installations. It addresses rules for overcurrent protection, wiring, hazardous locations, and emergency systems. This essential knowledge is vital for ensuring the safe use of electricity in various environments.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser