Question 1

The NEC permits low-voltage Class 2 doorbell cable to be run next to 120- or 240-volt branch circuits wired with nonmetallic sheathed cable.

Accepted Answer

NEC 725.136(A) allows Class 2 circuits to be installed in the same raceway or cable as power-limited fire alarm circuits and 600V nominal or less branch circuits. This includes nonmetallic sheathed cable (Type NM) used for 120- or 240-volt branch circuits.

Question 2

Electric ranges installed in houses are typically wired for __________-volt operation.

Accepted Answer

D

Question 3

A receptacle for a gas-fired range is permitted to be connected to a small appliance circuit in a kitchen.

Accepted Answer

A receptacle for a gas-fired range is permitted to be connected to a small appliance circuit in a kitchen because the gas-fired range is not a fixed appliance and the receptacle is not required to be dedicated to the range.

Question 4

The receptacle installed for a clothes washing machine located in a laundry area of an unfinished basement or a bathroom must be GFCI protected.

Accepted Answer

According to the National Electric Code (NEC), all receptacles installed in laundry areas or bathrooms must be GFCI protected for safety reasons.

Question 5

In the NEC, a bathroom is defined as an area that has a basin, a toilet, and a __________.

Accepted Answer

In the National Electrical Code (NEC), a bathroom is defined as an area that includes a basin, a toilet, and any of the following: a urinal, a tub, or a shower. This broad definition accommodates various bathroom configurations.

Question 6

The working space requirements of Section 110.26 in the NEC must be maintained when the disconnecting means for an air-conditioning unit on the outside of the house is installed.

Accepted Answer

Section 110.26 of the NEC states that sufficient working space must be provided and maintained around all electrical equipment such as disconnecting means. This includes air conditioning units located outside of a building. Therefore, the working space requirements must be maintained when installing disconnecting means for an outside air conditioning unit.

Question 7

The NEC requires at least one 15- or 20-ampere, 125-volt receptacle in a bathroom and it must be located no more than __________ inches from the outside edge of the basin.

Accepted Answer

The answer of The NEC requires at least one 15-...

Question 8

If a new electric clothes dryer is being installed in a home built before 1996 that has a three-wire cord-and-plug connection, the circuit must be replaced to accept a four-wire cord and plug.

Accepted Answer

It should be replaced but is not required to be replaced.

Question 9

In older smoke detectors, the interconnect wire was colored yellow, but newer smoke detectors are using a red interconnect wire.

Accepted Answer

This is true. Older smoke detectors used a yellow interconnect wire while newer ones use a red interconnect wire.

Question 10

In a laundry room, receptacles must be placed so that no point along the wall is more than 6' from a receptacle.

Accepted Answer

No spacing requirement in a laundry room

Question 11

If a counter-mounted cooktop unit has a nameplate rating of 7300 watts at 240 volts, the current draw will be __________ amperes.
a.
30.41
b.
41.65
c.
60.83
d.
72.6

Accepted Answer

The answer of If a counter-mounted cooktop unit has a...

Question 12

Smoke detectors in homes must be hardwired to the electrical system but may have battery backup.

Accepted Answer

Smoke detectors in homes are required to be hardwired to the electrical system for reliability but may also have a battery backup in case of power outages.

Question 13

There is no maximum number of receptacles allowed on 15- or 20-ampere branch circuits in a house according to the NEC but it is suggested that the maximum number of receptacles permitted on a 15-ampere rated circuit be no more than 10 and the maximum number of receptacles permitted on a 20-ampere rated circuit be no more than __________.

Accepted Answer

The answer of There is no maximum number of receptacles...

Question 14

A(n) __________ circuit breaker has a trip time that gets faster as the fault current flowing through it gets larger.

Accepted Answer

An inverse time circuit breaker has a trip time that decreases as the fault current increases, providing more protection against high-current faults. A dual-element circuit breaker has two different trip elements that provide protection against both high and low current faults. A plug fuse is a type of overcurrent protection device that has a metal wire that melts when the current becomes too high, while a type S circuit breaker is a specific type of dual-element circuit breaker that is used in specific applications. Therefore, the best choice for a circuit breaker with a trip time that gets faster as the fault current increases is an inverse time circuit breaker.

Question 15

In an electric motor circuit, the size of the circuit breaker and the circuit conductors is determined by the __________ of the motor.

Accepted Answer

The circuit breaker and circuit conductor size are determined by the full load current of the motor, not by the horsepower rating or voltage rating. The full load current is the amount of current that the motor draws when it is operating at full capacity. Therefore, B is the correct answer.

Question 16

A general lighting branch circuit installed in a house and protected by a 15-ampere circuit breaker may be wired with a __________ AWG copper conductor.

Accepted Answer

The answer of A general lighting branch circuit installed in...

Question 17

Electric water heaters must be wired with a three-wire cable because the white conductor in a two-wire cable is not permitted to be used as an ungrounded conductor in this type of installation.

Accepted Answer

The white conductor in a two-wire cable is permitted to be reidentified in this type of installation

Question 18

A receptacle located under a kitchen sink for a cord-and-plug-connected garbage disposal must be GFCI protected.

Accepted Answer

There are two reasons why this is false: (1) The receptacle does not serve the countertop surface; and (2) when determining distance from receptacles, it is measured as the shortest path the cord would follow without going through the cabinet doors.So, the requirement that receptacles installed within 6F1F1F1S1F1F1F10 from the top inside edge of the bowl of the sink need to be GFCI protected does not apply.

Question 19

HACR is an acronym found on some circuit breakers and stands for "heating, air conditioning, and ventilation."

Accepted Answer

Heating, air conditioning, and refrigeration

Question 20

The minimum number of small appliance circuits required by the NEC in each house is __________.

Accepted Answer

The NEC requires at least two small appliance circuits in each house. One is required for the kitchen and the other for the laundry room. This helps to prevent overloading of circuits and potential electrical hazards.

Quiz 14: Branch-Circuit Installation