Question 1

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

Accepted Answer

The definition given in the question perfectly fits the description of a branch circuit. It starts at a final overcurrent device (such as a circuit breaker or fuse) and supplies power to the outlets (such as receptacles or light fixtures). Open circuit refers to a circuit that is not closed or completed, feeder circuit refers to a circuit that supplies power to subpanels or other larger circuits, and service conductor refers to the conductors that bring electricity from the utility to the building's main electrical panel.

Question 2

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

Accepted Answer

The rating of a panelboard is based on the ampacity of the buss bar, as it is the part of the panelboard that conducts the electrical current to each circuit breaker.

Question 3

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.

Accepted Answer

According to the National Electrical Code, a demand factor of 75% must be applied to the total load of four fixed appliances (such as ranges, water heaters, and space heaters) when performing a standard service entrance calculation for a residential dwelling.

Question 4

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

Accepted Answer

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

Question 5

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

Accepted Answer

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

Question 6

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

Accepted Answer

The NEC® defines a branch circuit as the circuit conductors between the final overcurrent device protecting the circuit and the outlets, not between the service equipment and the outlets.

Question 7

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

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.

Question 8

A 200-ampere rated panel is designed and manufactured to accommodate __________ circuits.

Accepted Answer

The answer of A 200-ampere rated panel is designed and...

Question 9

A supplemental grounding electrode is a grounding electrode used to 'back-up' a metal water pipe grounding electrode.

Accepted Answer

A supplemental grounding electrode is indeed used as a backup for a metal water pipe grounding electrode. This ensures proper grounding even if the water pipe electrode fails to function properly.

Question 10

When doing branch circuit, feeder, and service entrance calculations, one volt-amp equals __________.

Accepted Answer

One volt-amp (VA) equals one watt (W) in an electrical system. This conversion factor is essential when calculating power in branch circuits, feeders, and service entrances.

Question 11

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

Accepted Answer

The conductors between the service equipment and the final branch circuit overcurrent protection device are known as feeder circuits. Branch circuits are the conductors from the branch circuit overcurrent protection device to the outlets or loads, while service conductors are the conductors from the utility source to the service equipment. An open circuit is a circuit that is incomplete, meaning that there is a gap or break in the circuit, causing electrical current to stop flowing.

Question 12

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

Accepted Answer

According to NEC 310.15(B)(3)(a), if cables are bundled together for more than 24" and the total number of current-carrying conductors exceeds 3, the ampacity of the conductors must be derated. Therefore, the best choice is B, which corresponds to 3.

Question 13

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

Accepted Answer

Bathrooms typically have their own dedicated circuits due to the presence of water and the need for GFCI protection, separate from small appliance circuits.

Question 14

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 15

Which of the following loads does not require a grounded circuit conductor?

Accepted Answer

A 2-wire, 240-volt circuit does not require a grounded circuit conductor because it operates with two hot wires and no neutral.

Question 16

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

The NEC (National Electrical Code) defines a bathroom as an area containing a basin with one or more of the listed plumbing fixtures.

Question 17

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-amps are computed at 100%

Accepted Answer

According to the NEC, the demand factor for the general lighting load, small appliance circuits, and laundry circuit in a single-family dwelling is 100%. Therefore, the first 3,000 volt-amps are computed at 100%. The other loads, such as the heating and cooling loads and the range, are subject to a different demand factor.

Question 18

A house with 2,000 square feet of habitable living space will require at least _________ general lighting circuits if 15-ampere circuit breakers are used to provide circuit protection.

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 19

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

Accepted Answer

outlet

Question 20

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

Accepted Answer

According to the NEC (National Electrical Code), the unit load used to calculate the minimum number of general lighting circuits in a dwelling is 3 volt-amperes per square foot. Therefore, the correct answer is B.

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