NCCER Electrical Level 2 Module 7
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What are the safety precautions when working with electrical circuits?
✔✔ Always de-energize circuits before working on them, wear proper PPE, use insulated tools,
and follow NEC safety codes to prevent accidents.
How do you test a circuit breaker for proper operation?
✔✔ A circuit breaker can be tested by manually toggling it to ensure it trips when an overload or
short circuit occurs, and by using a multimeter to check for continuity when in the "on" position.
What is the function of a relay in an electrical system?
✔✔ A relay is an electrically operated switch that uses a small current to control a larger current,
often used in control circuits.
What are the components of a motor control circuit?
✔✔ The components of a motor control circuit typically include a contactor, overload relay,
motor, and control switches, which work together to control motor operation.
1
, What does "derating" mean in the context of electrical systems?
✔✔ Derating refers to reducing the ampacity of a conductor or equipment based on
environmental factors such as temperature, installation method, or number of conductors in a
conduit.
What is the purpose of an overload relay?
✔✔ An overload relay protects a motor or other equipment by disconnecting power if the current
exceeds a safe level for an extended period, preventing damage.
What is the difference between a three-way switch and a single-pole switch?
✔✔ A three-way switch allows control of a circuit from two locations, while a single-pole switch
controls a circuit from one location.
What is the function of a light dimmer switch?
✔✔ A light dimmer switch adjusts the brightness of lights by varying the amount of voltage
supplied to the fixture.
What is the function of a conduit system in electrical installations?
2
Questions and Answers | Latest Version
| 2024/2025 | Correct & Verified
What are the safety precautions when working with electrical circuits?
✔✔ Always de-energize circuits before working on them, wear proper PPE, use insulated tools,
and follow NEC safety codes to prevent accidents.
How do you test a circuit breaker for proper operation?
✔✔ A circuit breaker can be tested by manually toggling it to ensure it trips when an overload or
short circuit occurs, and by using a multimeter to check for continuity when in the "on" position.
What is the function of a relay in an electrical system?
✔✔ A relay is an electrically operated switch that uses a small current to control a larger current,
often used in control circuits.
What are the components of a motor control circuit?
✔✔ The components of a motor control circuit typically include a contactor, overload relay,
motor, and control switches, which work together to control motor operation.
1
, What does "derating" mean in the context of electrical systems?
✔✔ Derating refers to reducing the ampacity of a conductor or equipment based on
environmental factors such as temperature, installation method, or number of conductors in a
conduit.
What is the purpose of an overload relay?
✔✔ An overload relay protects a motor or other equipment by disconnecting power if the current
exceeds a safe level for an extended period, preventing damage.
What is the difference between a three-way switch and a single-pole switch?
✔✔ A three-way switch allows control of a circuit from two locations, while a single-pole switch
controls a circuit from one location.
What is the function of a light dimmer switch?
✔✔ A light dimmer switch adjusts the brightness of lights by varying the amount of voltage
supplied to the fixture.
What is the function of a conduit system in electrical installations?
2
