Question 1

The rating of a panelboard is based on the ampacity of the __________.
A) main breaker
B) bus bar
C) service conductor
D) total amperage of each breaker in the panelboard

Accepted Answer

The rating of a panelboard is based on the ampacity of the bus bar. The bus bar is responsible for delivering the electrical current to the individual circuit breakers. Therefore, the panelboard rating must be equal to or greater than the total ampacity of the bus bar to ensure safe and efficient operation.

Question 2

The circuit conductors between the service equipment and the final branch circuit overcurrent protection device is a(n) __________.
A) open circuit
B) branch circuit
C) feeder circuit
D) service conductor

Accepted Answer

The circuit conductors between the service equipment and the final branch circuit overcurrent protection device are called feeder circuits. Feeder circuits are commonly used to supply power to large buildings or areas where several branch circuits may be necessary.

Question 3

Section 210.11(C)(4) requires at least one 120-volt, 20-ampere garage branch circuit to supply light fixtures in each attached garage and each detached garage that has electrical power.

Accepted Answer

The branch circuit is required to supply receptacles.

Question 4

An individual branch circuit supplies only one piece of electrical equipment such as an electric range or a dishwasher.

Accepted Answer

An individual branch circuit is designed to supply power to only one piece of electrical equipment.

Question 5

An area including a basin with one or more of the following: a toilet, a urinal, a tub, a shower, a bidet, or similar plumbing fixtures is called a bathroom according to the NEC.

Accepted Answer

This is because a bathroom is defined as "an area including a basin with one or more of the following: a toilet, a urinal, a tub, a shower, a bidet, or similar plumbing fixtures" in the National Electrical Code (NEC).

Question 6

When doing a standard service entrance calculation, if a residence has four fixed appliances, a demand factor of __________% is applied to the total load of these appliances.
A) 50
B) 75
C) 80
D) 100

Accepted Answer

According to the National Electrical Code (NEC), when a residence has four or more fixed appliances, a demand factor of 75% is applied to the total load of these appliances. This means that only 75% of the total load needs to be accounted for when sizing the service entrance.

Question 7

A circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit is called a multiwire circuit.

Accepted Answer

This is the definition of a multiwire circuit.

Question 8

According to the NEC, the unit load used to calculate the minimum number of general lighting branch circuits in a dwelling is __________ volt-amperes per square foot.
A) 2
B) 3
C) 4
D) 5

Accepted Answer

The NEC specifies a unit load of 3 volt-amperes per square foot for calculating the minimum number of general lighting branch circuits in a dwelling.

Question 9

Which of the following areas is included when computing the general lighting load of a house?
A) Open porches
B) Garages
C) Crawl spaces
D) Finished basements

Accepted Answer

Finished basements are considered part of the habitable space of a house and are included in the general lighting load calculations.

Question 10

Kitchen lighting outlets are permitted to be connected to any of the small-appliance branch circuits that provide power for the kitchen receptacles.

Accepted Answer

Kitchen lighting outlets are not permitted to be connected to small appliance branch circuits.

Question 11

In residential wiring, which of the following house areas does not have its power supplied by a small appliance circuit?
A) Bathroom
B) Dining room
C) Kitchen
D) Pantry

Accepted Answer

Bathrooms require their own dedicated circuits and are not supplied by a small appliance circuit. Small appliance circuits typically supply power to kitchens, dining rooms, and pantries, among other areas, but not bathrooms due to their specific power needs and safety regulations.

Question 12

The NEC defines a branch circuit as the circuit conductors between the service equipment and the power or lighting outlets.

Accepted Answer

Branch circuit is the wiring after the final overcurrent device and the outlets.

Question 13

If cables are bundled together for more than 24 inches and the total number of current-carrying conductors exceeds __________, the ampacity of the conductors must be derated.
A) two
B) three
C) four
D) five

Accepted Answer

According to the National Electrical Code (NEC) 310.15(B)(3)(a), if cables are bundled together for more than 24 inches and the total number of current-carrying conductors exceeds three, the ampacity of the conductors must be derated. Therefore, the correct answer is B.

Question 14

When doing service entrance calculations, 1 volt-ampere equals __________.
A) 1 joule
B) 1 watt
C) 1 ohm
D) 1 mil

Accepted Answer

One volt-ampere (VA) is equal to one watt (W) in AC circuits, which is a measure of real power. Joules (J) are a measure of energy, ohms (Ω) are a measure of resistance, and mils are a unit of measurement for thickness.

Question 15

The point on the wiring system at which current is taken to supply electrical equipment is called a receptacle.

Accepted Answer

outlet

Question 16

A(n) __________ is the circuit conductors between the final overcurrent device and the outlets.
A) open circuit
B) branch circuit
C) feeder circuit
D) service conductor

Accepted Answer

Branch circuits are the circuits that run from the final overcurrent device (such as a circuit breaker or fuse) to the outlets, or loads, they serve. Feeder circuits, on the other hand, are the circuits that run from the service equipment to the distribution panel(s) and provide power to multiple branch circuits. Service conductors are the conductors that run from the electric utility's distribution system to the service equipment of a building or facility. Open circuit refers to a circuit that is not complete and does not allow current to flow.

Question 17

A house with 2000 square feet of habitable living space will require at least _________ general lighting circuits if 15-ampere circuit breakers are used to provide circuit protection.
A) 3
B) 4
C) 5
D) 6

Accepted Answer

2000 sq.ft.F1F1F1S1F1F1F10 3 VA/sq.ft.= 6000 VA
6000 VA/120 V = 50 A
50 A/15 A = 3.3
3.3 circuits round up to 4 circuits

Question 18

Section 230.79(C) requires that for a single-family dwelling, the service disconnecting means must have a rating of not less than 100 amperes.

Accepted Answer

This is a correct statement according to section 230.79(C) of the National Electrical Code (NEC).

Question 19

When doing a standard service entrance calculation and applying the demand factor to the total load of the general lighting load, the small appliance circuits, and the laundry circuit, the first ___________ volt-amperes are computed at 100%.
A) 2000
B) 2500
C) 3000
D) 4000

Accepted Answer

For standard service entrance calculations, the National Electrical Code (NEC) specifies that the first 3000 volt-amperes of the total load (which includes general lighting, small appliance circuits, and laundry circuits) should be computed at 100%. This is part of applying demand factors to accurately size the service or feeder capacity.

Question 20

Which of the following is not permitted to be connected to a small appliance branch circuit?
A) Refrigerator
B) Electric clock
C) Gas stove
D) Kitchen lighting fixture

Accepted Answer

Kitchen lighting fixtures are not permitted to be connected to a small appliance branch circuit according to the National Electrical Code (NEC). Small appliance circuits are specifically designated for serving countertop appliances and similar equipment in kitchens, dining areas, and similar locations, not for lighting fixtures.

Quiz 6: Determining Branch Circuit, Feeder Circuit, and Service Entrance Requirements

The rating of a panelboard is based on the ampacity of the __________.

The circuit conductors between the service equipment and the final branch circuit overcurrent protection device is a(n) __________.

Section 210.11(C)(4) requires at least one 120-volt, 20-ampere garage branch circuit to supply light fixtures in each attached garage and each detached garage that has electrical power.

An individual branch circuit supplies only one piece of electrical equipment such as an electric range or a dishwasher.

An area including a basin with one or more of the following: a toilet, a urinal, a tub, a shower, a bidet, or similar plumbing fixtures is called a bathroom according to the NEC.

When doing a standard service entrance calculation, if a residence has four fixed appliances, a demand factor of __________% is applied to the total load of these appliances.

A circuit that consists of two or more ungrounded conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit is called a multiwire circuit.

According to the NEC, the unit load used to calculate the minimum number of general lighting branch circuits in a dwelling is __________ volt-amperes per square foot.

Which of the following areas is included when computing the general lighting load of a house?

Kitchen lighting outlets are permitted to be connected to any of the small-appliance branch circuits that provide power for the kitchen receptacles.

In residential wiring, which of the following house areas does not have its power supplied by a small appliance circuit?

The NEC defines a branch circuit as the circuit conductors between the service equipment and the power or lighting outlets.

If cables are bundled together for more than 24 inches and the total number of current-carrying conductors exceeds __________, the ampacity of the conductors must be derated.

When doing service entrance calculations, 1 volt-ampere equals __________.

The point on the wiring system at which current is taken to supply electrical equipment is called a receptacle.

A(n) __________ is the circuit conductors between the final overcurrent device and the outlets.

A house with 2000 square feet of habitable living space will require at least _________ general lighting circuits if 15-ampere circuit breakers are used to provide circuit protection.

Section 230.79(C) requires that for a single-family dwelling, the service disconnecting means must have a rating of not less than 100 amperes.

When doing a standard service entrance calculation and applying the demand factor to the total load of the general lighting load, the small appliance circuits, and the laundry circuit, the first ___________ volt-amperes are computed at 100%.

Which of the following is not permitted to be connected to a small appliance branch circuit?