Manufacturing Practice Workshop: House Wiring
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Questions and Answers

What is the purpose of the earthing connection in an extension board?

  • To improve the aesthetic appearance of the board
  • To protect against electrical shocks (correct)
  • To enhance the power output of the sockets
  • To allow for remote control of the switches
  • In a two-way switch configuration, how many switches are required to control one lamp?

  • It varies by the design of the circuit
  • Three switches
  • One switch
  • Two switches (correct)
  • Which component is NOT needed when assembling an electric extension board?

  • Plastic box
  • Light bulb (correct)
  • Connecting wires
  • Sockets
  • What is the technical term for a two-way switch?

    <p>Single Pole Double Through (SPDT) Switch (A)</p> Signup and view all the answers

    What is the first step in assembling an extension board?

    <p>Marking the positions of switches and sockets (A)</p> Signup and view all the answers

    What is the primary function of the electric meter in a home?

    <p>To measure the amount of electricity used (A)</p> Signup and view all the answers

    Where is a disconnect switch typically located in a residential electrical system?

    <p>Near the electric meter on an outside wall (D)</p> Signup and view all the answers

    What does the main service panel, or breaker box, connect to?

    <p>To the power service and meter (B)</p> Signup and view all the answers

    What is the purpose of the main circuit breaker in an electrical service panel?

    <p>To control the power to the rest of the circuit breakers (C)</p> Signup and view all the answers

    Which wire connects to the neutral bus bar inside the main service panel?

    <p>Neutral wire (D)</p> Signup and view all the answers

    What is the significance of the main breaker being rated at 200 amps?

    <p>It limits the maximum current flowing through it to 200 amps (A)</p> Signup and view all the answers

    What should one do in case of a fire or emergency concerning the electrical system?

    <p>Use the disconnect switch to shut off power (C)</p> Signup and view all the answers

    What is NOT typically a function of the main service panel?

    <p>Electric meter reading (A)</p> Signup and view all the answers

    What happens when a branch circuit breaker trips?

    <p>Power is shut off to only the affected circuit. (B)</p> Signup and view all the answers

    Which of the following statements accurately describes switches?

    <p>Different types of switches are available for various functions. (B)</p> Signup and view all the answers

    What is the primary function of electrical outlets?

    <p>To provide access to power for plug-in devices. (B)</p> Signup and view all the answers

    What type of wiring is most commonly used for residential circuits?

    <p>Romex nonmetallic cable. (D)</p> Signup and view all the answers

    Which component is essential for automatically cutting off power when a fault occurs in a circuit?

    <p>Circuit breaker (B)</p> Signup and view all the answers

    Which of the following best describes the term 'open circuit'?

    <p>A broken or incomplete circuit with no power flow. (C)</p> Signup and view all the answers

    What distinguishes a 20-amp outlet from a 15-amp outlet?

    <p>A 20-amp outlet can handle more electrical devices without tripping a breaker. (D)</p> Signup and view all the answers

    What is the role of a fan regulator in a house wiring system?

    <p>To control the speed of the ceiling fan. (A)</p> Signup and view all the answers

    Flashcards

    Electric Meter

    The electrical meter measures how much electricity is consumed in a home and serves as the basis for billing.

    Disconnect Switch

    A dedicated disconnect switch allows you to safely shut off power from outside the home in case of emergency or maintenance.

    Main Service Panel (Breaker Box)

    The main service panel, often called the breaker box, distributes electricity to all circuits in the house. It contains circuit breakers that protect individual circuits.

    Main Circuit Breaker

    The main breaker is the primary switch that controls power to all other circuit breakers in the panel.

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    Lugs

    These large terminals in the service panel connect the house's main power supply wires.

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    Neutral Bus Bar

    The neutral bar is a conductor in the service panel where neutral wires from all circuits are connected.

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    House Wiring

    House wiring refers to the system of wires and connections that distribute electricity throughout a home.

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    Service Capacity

    The service capacity determines the maximum amount of current that can safely flow through the main breaker without tripping.

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    What is an extension board?

    An electrical extension board provides multiple outlets by extending the reach of a power source. It typically consists of a box containing switches, sockets, and a plug.

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    What is two-way switching?

    Two-way switching allows you to control a light fixture from two or more locations. It's commonly used in stairwells or long hallways. The switches operate independently, meaning you can turn the light on or off from either switch.

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    Describe a two-way switch.

    A two-way switch is a type of switch that allows you to control a circuit from two locations. It has two sets of terminals, enabling you to break or complete the circuit with either position of the switch.

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    What is a circuit diagram?

    A circuit diagram is a visual representation of the electrical connections in a system. It shows the components, wiring paths, and how they are interconnected. This diagram helps understand how the circuit functions.

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    What is an SPDT switch?

    A Single Pole Double Through (SPDT) switch is a type of switch that has one pole and two throws. It can connect to two different circuits. In a two-way switching system, the two-way switch is a SPDT switch.

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    Branch Circuit Breaker

    A switch that controls the flow of electricity to a specific part of the house, like a room or appliance. It prevents overloading and protects the electrical circuit from damage.

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    Electrical Devices

    The devices connected to the electrical system in your home, including switches, outlets, lights, appliances, and more.

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    Switch

    A device that allows you to control the flow of electricity to an electrical circuit. When the switch is on, the circuit is complete and power flows. When the switch is off, the circuit is broken and power is interrupted.

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    Receptacle

    An electrical outlet that provides power to plug-in devices and appliances.

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    NM Cable (Romex)

    A type of electrical cable used for wiring homes. It's often used inside walls and ceilings because it's easy to install.

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    Circuit Breaker

    A protective device that automatically interrupts the flow of electricity in a circuit when there's an overload or fault. It prevents fires and damage.

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    Double Pole Miniature Circuit Breaker (DP MCB)

    A type of circuit breaker that is designed to control two wires carrying electricity. It's typically used for appliances with higher power requirements.

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    Study Notes

    Manufacturing Practice Workshop

    • Subject: Manufacturing Practice Workshop (MEC05102)
    • Year Level: First Year B.Tech (2024 Patt.)
    • Academic Year: 2024-25
    • Semester: 1
    • Experiment No. 9: Study of house wiring and making simple electric connections

    Aim

    • To study house wiring connections and practice making simple electric connections to operate a lamp with 2-way switches, including an extension board.

    House Wiring Basics

    • Electrical Service Connection and Meter: The meter measures electricity usage, which is the basis for billing. The meter only runs when electricity is used.
    • Disconnect Switch: Located outside the home, near the meter; used to cut power to the house in case of emergencies or maintenance.
    • Main Service Panel (Breaker Box): Receives power from the meter; contains "hot" wires connecting to the main circuit breaker. A neutral wire connects to the neutral bus bar.
    • Main Circuit Breaker: Controls the entire electrical service to the house. It's rated for a specific amperage (e.g., 200 amps), preventing overloads.
    • Branch Circuit Breakers: Located in the panel, these breakers control power to specific branches of the house. Circuit breakers trip automatically to prevent electrical problems like overloads or faults.
    • Devices: Electrical devices like switches, receptacles, lights, and appliances are connected to the branch circuits.
    • Switches: Devices that turn electrical devices on and off. Various types exist (e.g., single-pole, two-way, three-way).
    • Outlets (Receptacles): Provide power to plug-in devices. Common ratings are 15-amp or 20-amp.
    • Wiring: Nonmetallic cable (Romex), box cable and wiring concealed in conduit are common types used.

    Making an Electric Extension Board

    • Components: Wooden/plastic box, electric wires, switches, sockets, plug (15A)
    • Procedure:
      • Mark positions for switches and sockets.
      • Cut holes for switches and sockets.
      • Install switches and sockets.
      • Wire the board as per the diagram.
      • Ensure proper earthing connections.
      • Tighten all connections.
      • Test the board.

    Two-Way Switch

    • Aim: To make electric connections to operate a bulb using a two-way switch.
    • Description: Two-way switches allow controlling a single device (e.g. a light) from two different locations. The two-way switch is technically a Single Pole Double Through (SPDT) switch.
    • Components: Two 2-way switches, a bulb, an AC supply, connecting wires.
    • Diagram: Provided, illustrating the wiring connections.

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    Description

    This quiz focuses on Experiment No. 9 from the Manufacturing Practice Workshop (MEC05102). It covers the fundamentals of house wiring and the process of making simple electric connections. Students will gain hands-on experience with 2-way switches and extension boards, promoting practical knowledge in electrical services.

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