Electrical Conduits and Junction Boxes
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Questions and Answers

What is the primary purpose of a junction box?

  • To store excess wiring safely
  • To serve as a power outlet
  • To connect solar panels to the mains
  • To protect people from contact with live wires (correct)

    • Which material is NOT typically used to make junction boxes?

  • Fiberglass
  • Ceramic (correct)
  • Metal
  • PVC

    • Which type of conduit is considered the most heavy-duty?

  • Fiberglass conduit
  • Rigid Metal Conduit (RMC) (correct)
  • Intermediate Metal Conduit (IMC)
  • PVC conduit

    • What type of junction box is specifically designed to withstand outdoor conditions?

    <p>Waterproof junction box</p> Signup and view all the answers

    What is the primary benefit of using electrical conduits?

    <p>To guide and protect wiring</p> Signup and view all the answers

    Which type of conduit is lighter and often preferred for ease of handling?

    <p>Intermediate Metal Conduit (IMC)</p> Signup and view all the answers

    What advantage does a junction box provide in terms of fire safety?

    <p>It prevents fires from spreading when properly covered</p> Signup and view all the answers

    What do utility boxes house?

    <p>Electric transformers and various connections</p> Signup and view all the answers

    What is the primary material used for manufacturing Electrical Metallic Tubing (EMT)?

    <p>Galvanized steel</p> Signup and view all the answers

    What is a key characteristic of Flexible Metal Conduit (FMC)?

    <p>It allows for flexibility over short distances.</p> Signup and view all the answers

    Which of the following applications is Liquid-Tight Flexible Metal Conduit (LFMC) best suited for?

    <p>Outdoor applications in wet conditions</p> Signup and view all the answers

    What does ENT stand for in conduit types?

    <p>Electrical Non-Metallic Tubing</p> Signup and view all the answers

    Which of the following is a method to bend Rigid PVC Conduit?

    <p>Heating it before bending</p> Signup and view all the answers

    What is a significant disadvantage of using Electrical Non-Metallic Tubing (ENT) outdoors?

    <p>It is not UV-resistant.</p> Signup and view all the answers

    What type of applications is Rigid PVC Conduit particularly useful for?

    <p>Direct burial and corrosive environments</p> Signup and view all the answers

    Which tool is commonly used to cut Electrical Metallic Tubing (EMT)?

    <p>12V reciprocating saw with a high TPI blade</p> Signup and view all the answers

    What type of wire is commonly used for branch circuits in electrical systems?

    <p>Size No. 12</p> Signup and view all the answers

    What does the 'T' in THHN wire stand for?

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

    Which of the following is a characteristic of THWN cable?

    <p>Water resistant</p> Signup and view all the answers

    What is the purpose of circuit breakers in an electrical system?

    <p>Interrupt the flow of electricity during overload</p> Signup and view all the answers

    What should be observed during the computation of loads in an electrical plan?

    <p>The number of outlets and current capacity</p> Signup and view all the answers

    Which of the following best describes a riser diagram?

    <p>A single line representation of the entire electrical circuit</p> Signup and view all the answers

    What should be done to prevent faulty electrical wiring in a house?

    <p>Upgrade the electrical system regularly</p> Signup and view all the answers

    What type of service is indicated when describing a single-phase circuit?

    <p>Two wires only</p> Signup and view all the answers

    Study Notes

    Junction Box

    • A junction box is a protective box used to connect electrical wires.
    • Often built into walls, ceilings, or concrete.
    • Commonly used in homes, buildings, and factories.
    • Available in both indoor and outdoor versions.
    • Waterproof junction boxes are typically used outdoors.
    • Made from metal or plastic.
    • Four main types: Metal, PVC, ABS, Fiberglass.

    Utility Box

    • An above-ground structure that houses electrical transformers, switches, and connections.
    • Distributes utility services from a main line to individual buildings.

    Electrical Conduit

    • Physical pathways for running wiring in a building.
    • Provides guidance and protection for wiring.

    Electrical Conduit Types

    • RMC (Rigid Metal Conduit)
      • Heavy-duty conduit made from galvanized steel.
      • Resistant to environmental damage.
      • Provides structural support.
    • IMC (Intermediate Metal Conduit)
      • Lighter and thinner version of RMC.
      • Suitable for the same applications as RMC.
    • EMT (Electrical Metallic Tubing)
      • Rigid metal conduit made from galvanized steel (or aluminum).
      • Easy to bend but can kink.
      • Uses conduit benders for proper bends.
    • FMC (Flexible Metal Conduit)
      • Spiral-shaped conduit made from steel or aluminum.
      • Designed for easy flexing over short distances.
      • Ideal for tight spaces or around existing equipment.
    • LFMC (Liquid-Tight Flexible Metal Conduit)
      • Similar to FMC but with a waterproof coating.
      • Suitable for outdoor and wet interior areas.
      • Requires watertight fittings.
    • ENT (Electrical Non-Metallic Tubing)
      • Flexible PVC tubing.
      • Used behind walls, under floors, and as an EMT substitute.
      • Not UV-resistant.
    • Rigid PVC Conduit
      • Similar to PVC used for plumbing and irrigation.
      • Requires heating to bend.
      • Watertight and suitable for direct burial and corrosive environments.

    THHN Wire and THWN Cable

    • THHN (Thermoplastic High Heat Nylon): Single-conductor general-purpose building wire.
      • Made from thermoplastic PVC.
      • Suitable for dry locations.
    • THWN (Thermoplastic Heat and Water Resistant): Single-conductor wire suitable for both dry and wet locations.
      • Made from thermoplastic PVC.

    Wire Gauges Size and Ampacity

    • Refers to the thickness of the wire determining its current-carrying capacity.

    Computation of Loads

    • Essential when designing an electrical plan.
    • Determines the number of lighting, convenience, and special-purpose outlets.
    • Ensures safe electrical system operation.
    • Helps prevent short circuits and overloading.
    • Encourages upgrades to prevent faulty wiring.

    Riser Diagram

    • A single-line diagram showing the entire electrical circuit.
    • Presents information about:
      • Service type (single-phase 2 or 3 wires)
      • Service entrance conduit and wire size
      • Wire type and size for each branch
      • Protective device size (circuit breaker)

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    Related Documents

    Electrical Conduit and Junction Boxes PDF

    Description

    Explore the world of electrical junction boxes and conduits in this quiz. Learn about their types, uses, and materials, important for electrical installations in various settings. Whether for homes, buildings, or outdoor environments, understand the critical role these components play in electrical safety and efficiency.

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