Question 1

All metal device boxes need to have the circuit grounding conductor(s) connected to it with a 10-32 green grounding screw.

Accepted Answer

This is because the metal box itself needs to be grounded in case a live wire comes into contact with it, in order to prevent electrocution.

Question 2

A multiple receptacle has more than __________ contact device(s) on the same yoke.

Accepted Answer

A multiple receptacle has 2 contact devices on the same yoke.

Question 3

When a duplex receptacle is installed horizontally, it is recommended that the __________ slot be located on top.

Accepted Answer

When a duplex receptacle is installed horizontally, it is recommended that the grounded slot (the wider one) be located on top. This is because most electrical plugs have a grounding prong, which is larger than the other two prongs, and will fit securely in the grounded slot. Placing the ungrounded slot on top could allow for the possibility of an object or wire accidentally becoming stuck in the slot, which could cause a potential electrical hazard.

Question 4

A feed-through GFCI receptacle can provide GFCI protection for regular receptacles installed 'downstream' on the same branch circuit.

Accepted Answer

A feed-through GFCI receptacle can provide protection for other receptacles on the same branch circuit by detecting and interrupting electrical current in the circuit if a ground fault occurs.

Question 5

Which of the following is not considered to be a line surge?

Accepted Answer

Ground to neutral is not considered to be a line surge as it is typically seen as a grounding issue, rather than a surge issue. The other options are all types of line surges that can occur in electrical systems.

Question 6

A __________ operates by monitoring the current flow on both the ungrounded 'hot' conductor and the grounded conductor.

Accepted Answer

A Ground Fault Circuit Interrupter (GFCI) operates by monitoring the current flow on both the ungrounded 'hot' conductor and the grounded conductor. It is designed to quickly interrupt the circuit if it detects an imbalance in the current flow, indicating a current leakage to ground, which could pose a shock hazard to the user.

Question 7

Which of the following determine the effect electrical shock has on the body?

Accepted Answer

All three factors (amount of current, path of current, and length of time) determine the effect electrical shock has on the body. The amount of current affects the severity of the shock, while the path of current determines which organs and tissues are affected. The length of time the current flows through the body can also increase the damage done to the body.

Question 8

A(n) __________ line surge is caused by inductive loads in a residence such as spark igniters on gas ranges and clothes dryers, electric motors, and computers.

Accepted Answer

The type of surge caused by inductive loads in a residence, including spark igniters on gas ranges and clothes dryers, electric motors, and computers, is a ring wave surge. This type of surge is characterized by a wave that oscillates back and forth before dissipating.

Question 9

The most common receptacle type used in residential wiring is the single receptacle.

Accepted Answer

The most common receptacle type used in residential wiring is the duplex receptacle, which has two outlets.

Question 10

A GFCI device provides protection against __________.

Accepted Answer

A GFCI device provides protection against ground faults, which occur when electricity travels outside of its intended path and through a person's body. Short circuits and overcurrents can also be dangerous, but they are not the specific type of electrical hazard that a GFCI protects against.

Question 11

Section 404.10(B) specifies that screws used for attaching a switch to an electrical box must be sheet metal screws with a thread that matches the thread gage or size of the screw holes in the box.

Accepted Answer

Must be machine screws

Question 12

A grounding conductor may not be __________.

Accepted Answer

A grounding conductor may not be green with white stripes, as this color combination is not recognized for grounding conductors.

Question 13

A GFCI device is designed to trip when fault current levels are _____ milliamps or more and not to trip when the fault current is less than _____ ma.

Accepted Answer

GFCI devices are designed to trip when fault current levels exceed 6 milliamps and not to trip when the fault current is less than 4 milliamps, as per the National Electrical Code (NEC).

Question 14

If a white conductor in a Romex cable is connected to a traveler terminal on a three-way switch, it does not have to be re-identified because it is not 'hot' all the time.

Accepted Answer

According to NEC (National Electrical Code) 2017, section 200.7(C)(2), all conductors that are not intended to be grounded or neutral conductors must be re-identified if they are used for a purpose other than their intended purpose. In this scenario, the white conductor in a Romex cable is intended to be a neutral conductor, and if it is used as a traveler, it must be re-identified with a color other than white, gray, or green to indicate its new function.

Question 15

When self-grounding receptacles are used with nonmetallic device boxes there is no need to attach the circuit grounding conductor to the green screw on the receptacle.

Accepted Answer

Self-grounding receptacles are used with metal boxes.

Question 16

A __________ switch would be used to control two lights from one location.

Accepted Answer

A single-pole switch is used to control a light (or lights) from one location. This is the most common type of switch found in homes for basic lighting control.

Question 17

In all areas specified in Section 210.52, all nonlocking type 125 volt, 15- and 20- amp receptacles must be tamper-resistant. (General Rule)

Accepted Answer

The stated rule is true. All nonlocking type 125 volt, 15- and 20- amp receptacles in the specified areas must be tamper-resistant.

Question 18

Which of the following conductors are permitted to be used for the push-in method of attaching conductors to a device?

Accepted Answer

The push-in method is generally recommended for use with solid and stranded copper conductors only, as these conductors provide a secure and reliable connection. Aluminum and copper-clad aluminum conductors are more prone to oxidation and require specialized connectors to prevent corrosion and ensure proper contact.

Question 19

On a 20-ampere rated branch circuit, which of the following types of receptacles may not be used?

Accepted Answer

On a 20-ampere rated branch circuit, only 20-amp single and duplex receptacles can be used. 15-amp receptacles are not allowed because they cannot handle the full load of the circuit and could overheat and cause a fire hazard.

Question 20

Section 210.12(A) in the NEC ^® requires all of the 15- and 20-amp, 120-volt branch circuits installed in dwelling unit kitchens, family rooms, dining rooms, living rooms, parlors, libraries, dens, bedrooms, sun rooms, recreation rooms, closets, hallways, laundry areas, or similar rooms or areas to be AFCI protected.

Accepted Answer

Section 210.12(A) in the NEC requires all of the mentioned 15- and 20-amp, 120-volt branch circuits to be AFCI protected.

Quiz 18: Device Installation