Question 1

To calculate multiple noncoincident loads used simultaneously, the ____ load(s) that will be used at one time is (are) used in calculating the total feeder/service load.
A) average
B) largest
C) medial
D) smallest

Accepted Answer

The largest load that will be used at one time is the most appropriate load to use in calculating the total feeder/service load. This ensures that the system is designed to handle the maximum potential demand, reducing the risk of overloading and potential safety hazards.

Question 2

General-purpose receptacles are ____.
A) continuous loads
B) not allowed in commercial spaces
C) not included in the total load
D) not continuous loads

Accepted Answer

General-purpose receptacles are not continuous loads. Continuous load refers to a device or equipment that uses its maximum current for more than three hours at a time, while general-purpose receptacles are used for various electrical devices and do not operate continuously.

Question 3

Feeder conductors and overcurrent protection shall be sized at 100% of noncontinuous loads plus ____% of continuous loads.
A) 50
B) 75
C) 100
D) 125

Accepted Answer

Feeder conductors and overcurrent protection must be sized at 100% of noncontinuous loads plus 125% of continuous loads to safely handle the potential increased load and to prevent overheating or damage.

Question 4

The feeder (or service) neutral load is the ____ of the load determined by Article 220.
A) maximum balance
B) minimum unbalance
C) maximum unbalance
D) minimum unbalance

Accepted Answer

According to Article 220, the neutral load for a feeder or service is calculated as the maximum unbalance of the load.

Question 5

The demand factor for three pieces of equipment is 90%; for four pieces, ____%; for five pieces, 70%; and for more than five pieces, 65%.
A) 60
B) 70
C) 80
D) 90

Accepted Answer

The demand factor decreases as the number of pieces of equipment increases. Given that it is 90% for three pieces and 70% for five pieces, the demand factor for four pieces logically falls between these two values, making 80% the most reasonable choice.

Question 6

In calculating general lighting load, each floor's area shall be calculated using the building's (or area's) ____.
A) interior dimensions
B) outside dimensions
C) cross-sectional dimensions
D) cubic dimensions

Accepted Answer

In calculating general lighting load, each floor's area is calculated using the building's (or area's) outside dimensions. This approach ensures that the entire footprint of the building is considered, including wall thicknesses and other structural elements that might be excluded if interior dimensions were used.

Question 7

A load where the maximum current is expected to continue for ____ or more is a continuous load.
A) one hour
B) two hours
C) three hours
D) four hours

Accepted Answer

A continuous load is defined as a load where the maximum current is expected to continue for three hours or more.

Question 8

In determining the load of the highest-rated motor, the greater of either the ampere rating from 430.22(E) or the largest continuous-duty motor full-load current multiplied by ____ shall be used in the summation.
A) 0.75
B) 1.25
C) 1.50
D) 1.75

Accepted Answer

According to NEC 430.63, the load of the highest-rated motor shall be determined by the greater of either the ampere rating from 430.22(E) or the largest continuous-duty motor full-load current multiplied by 1.25. Therefore, the answer is B, which is 1.25.

Question 9

The load calculation form results (overcurrent protection and conductors) represent ____ requirement.
A) the complete
B) only a minimum
C) the first part of the
D) the written portion of the

Accepted Answer

The load calculation form results only represent the minimum requirement for overcurrent protection and conductors. Other factors such as ambient temperature, voltage drop, and equipment rating may require higher ratings for overcurrent protection and conductors.

Question 10

In office buildings, the receptacle load shall be calculated to be the larger of (1) the calculated load from 220.14(I), or (2) ____ volt-ampere(s) per square foot.
A) 1
B) 6
C) 8
D) 10

Accepted Answer

The answer of In office buildings, the receptacle load shall...

Question 11

Sign and outline lighting outlets in commercial buildings are computed at a minimum of ____ volt-amperes.
A) 600
B) 800
C) 1000
D) 1200

Accepted Answer

The answer of Sign and outline lighting outlets in commercial...

Question 12

Receptacle outlets are calculated at a minimum of ____ volt-amperes for each single (or multiple) receptacle on one yoke (or strap).
A) 180
B) 190
C) 195
D) 200

Accepted Answer

The National Electrical Code (NEC) specifies that receptacle outlets are calculated at a minimum of 180 volt-amperes for each single or multiple receptacle on one yoke.

Question 13

Where the grounding electrode conductor or bonding jumper connects to a single or multiple rod, pipe, or plate electrode(s) or any combination thereof, or does not extend on to other types of electrodes that require a larger size conductor, the grounding electrode conductor shall not be required to be larger than ____.
A) 2 AWG copper wire or 4 AWG aluminum
B) 4 AWG copper wire or 6 AWG aluminum
C) 6 AWG copper wire or 4 AWG aluminum
D) 6 AWG copper wire or 8 AWG aluminum

Accepted Answer

The answer of Where the grounding electrode conductor or bonding...

Question 14

Fractions of an ampere 0.5 and higher are ____, while fractions less than 0.5 are dropped.
A) rounded up
B) applied exactly
C) rounded down
D) halved

Accepted Answer

Fractions of an ampere 0.5 and higher are rounded up to the nearest whole number, while fractions less than 0.5 are dropped, according to standard rounding rules.

Question 15

Conductors ____ AWG and larger can be connected in parallel (electrically joined at both ends to form a single conductor).
A) 1/0
B) 1/2
C) 1/3
D) 1/4

Accepted Answer

According to the National Electric Code, conductors with a size of 1/0 AWG and larger can be connected in parallel.

Question 16

The volt-ampere unit load for an office building is ____.
A) 1.3
B) 2.5
C) 3.0
D) 3.5

Accepted Answer

The volt-ampere unit load for an office building depends on various factors including the size of the building, the number of floors, the number of rooms, and the load requirements of various electrical equipment. A rule of thumb for calculating the volt-ampere load in an office building is to multiply the total square footage by a factor of 3.5. Therefore, the correct answer is D) 3.5.

Question 17

Three-phase voltage is found by multiplying the voltage (single-phase) by ____.
A) 1.327
B) 1.732
C) 1.832
D) 1.914

Accepted Answer

Three-phase voltage is found by multiplying the voltage (single-phase) by the square root of 3, which is approximately 1.732. Therefore, the correct answer is B.

Quiz 13: Nondwelling Load Calculations

To calculate multiple noncoincident loads used simultaneously, the ____ load(s) that will be used at one time is (are) used in calculating the total feeder/service load.

General-purpose receptacles are ____.

Feeder conductors and overcurrent protection shall be sized at 100% of noncontinuous loads plus ____% of continuous loads.

The feeder (or service) neutral load is the ____ of the load determined by Article 220.

The demand factor for three pieces of equipment is 90%; for four pieces, ____%; for five pieces, 70%; and for more than five pieces, 65%.

In calculating general lighting load, each floor's area shall be calculated using the building's (or area's) ____.

A load where the maximum current is expected to continue for ____ or more is a continuous load.

In determining the load of the highest-rated motor, the greater of either the ampere rating from 430.22(E) or the largest continuous-duty motor full-load current multiplied by ____ shall be used in the summation.

The load calculation form results (overcurrent protection and conductors) represent ____ requirement.

In office buildings, the receptacle load shall be calculated to be the larger of (1) the calculated load from 220.14(I) , or (2) ____ volt-ampere(s) per square foot.

Sign and outline lighting outlets in commercial buildings are computed at a minimum of ____ volt-amperes.

Receptacle outlets are calculated at a minimum of ____ volt-amperes for each single (or multiple) receptacle on one yoke (or strap) .

Fractions of an ampere 0.5 and higher are ____, while fractions less than 0.5 are dropped.

Conductors ____ AWG and larger can be connected in parallel (electrically joined at both ends to form a single conductor) .

The volt-ampere unit load for an office building is ____.

Three-phase voltage is found by multiplying the voltage (single-phase) by ____.