NCCER 26401 Load Calculations - Feeders and
Services Latest Update 2025-2026 Actual Exam
80 Questions with 100% Verified Correct
Answers Guaranteed A+ Verified by Professor
A 240-volt feeder supplying twelve 120-volt, 30A shore power receptacles in a marina
requires a minimum ampacity of _____ amperes if the demand factor is 80%. -
CORRECT ANSWER: 240v /2 = 120 volts
Demand Factor: 0.8
12 * 30A * 120V = 43,200VA.
3,200VA * 0.8 = 34,560VA.
34, = 144 amperes.
A kitchen equipment load is subject to the application of a _____ demand factor. -
CORRECT ANSWER: The kitchen equipment load is subject to a 65% demand factor.
According to the 25′ tap rule, the tap conductors must be rated at no less than one-third
the ampacity of the overcurrent device protecting the feeder. If the feeders supplying a
continuous load are protected by a 125-ampere circuit breaker, what is the minimum
ampacity of tap conductors connected to these feeders? - CORRECT ANSWER: 1/3 *
125 amp = 41.67
After calculating the first 3,000VA of the general lighting and small appliance load at
100% for a multi-family dwelling, what is the demand factor that may be applied to the
next 117,000VA?
A. 5%
B. 25%
C. 35%
D. 50% - CORRECT ANSWER: 35%
, According to NEC Table 220.42, the first 3,000VA (out of 120,000VA) must be calculated
at 100%, and the next 117,000VA (up to 120,000VA) has a demand factor of 35%
applied to it.
Building - CORRECT ANSWER: A structure that stands alone or that is separated from
adjoining structures by firewalls.
Building - CORRECT ANSWER: A structure that stands alone or that is separated from
adjoining structures by firewalls.
Can be divided into three sections: Branch Circuits / Feeders / Services. - CORRECT
ANSWER: Basic Load Calculations
Dwelling unit - CORRECT ANSWER: A single unit providing complete and independent
living facilities for one or more persons, including permanent provisions for living,
sleeping, cooking, and sanitation. A one-family dwelling consists solely of one dwelling
unit. A two-family dwelling consists solely of two dwelling units. A multi-family dwelling is
a building containing three or more dwelling units
Feeder - CORRECT ANSWER: All circuit conductors between the service equipment,
the source of separately derived system, or other supply source and the final branch
circuit overcurrent device.
Feeder conductor size is adjusted when?
The load supplied is a continuous-duty load.
More than three current-carrying conductors are in a raceway.
The ambient temperature surrounding conductors exceeds temperature ratings.
Voltage drop exceeds 3% for feeders or 5% for the combination of the feeder and
branch circuit.
All of the above - CORRECT ANSWER: All of those above
Services Latest Update 2025-2026 Actual Exam
80 Questions with 100% Verified Correct
Answers Guaranteed A+ Verified by Professor
A 240-volt feeder supplying twelve 120-volt, 30A shore power receptacles in a marina
requires a minimum ampacity of _____ amperes if the demand factor is 80%. -
CORRECT ANSWER: 240v /2 = 120 volts
Demand Factor: 0.8
12 * 30A * 120V = 43,200VA.
3,200VA * 0.8 = 34,560VA.
34, = 144 amperes.
A kitchen equipment load is subject to the application of a _____ demand factor. -
CORRECT ANSWER: The kitchen equipment load is subject to a 65% demand factor.
According to the 25′ tap rule, the tap conductors must be rated at no less than one-third
the ampacity of the overcurrent device protecting the feeder. If the feeders supplying a
continuous load are protected by a 125-ampere circuit breaker, what is the minimum
ampacity of tap conductors connected to these feeders? - CORRECT ANSWER: 1/3 *
125 amp = 41.67
After calculating the first 3,000VA of the general lighting and small appliance load at
100% for a multi-family dwelling, what is the demand factor that may be applied to the
next 117,000VA?
A. 5%
B. 25%
C. 35%
D. 50% - CORRECT ANSWER: 35%
, According to NEC Table 220.42, the first 3,000VA (out of 120,000VA) must be calculated
at 100%, and the next 117,000VA (up to 120,000VA) has a demand factor of 35%
applied to it.
Building - CORRECT ANSWER: A structure that stands alone or that is separated from
adjoining structures by firewalls.
Building - CORRECT ANSWER: A structure that stands alone or that is separated from
adjoining structures by firewalls.
Can be divided into three sections: Branch Circuits / Feeders / Services. - CORRECT
ANSWER: Basic Load Calculations
Dwelling unit - CORRECT ANSWER: A single unit providing complete and independent
living facilities for one or more persons, including permanent provisions for living,
sleeping, cooking, and sanitation. A one-family dwelling consists solely of one dwelling
unit. A two-family dwelling consists solely of two dwelling units. A multi-family dwelling is
a building containing three or more dwelling units
Feeder - CORRECT ANSWER: All circuit conductors between the service equipment,
the source of separately derived system, or other supply source and the final branch
circuit overcurrent device.
Feeder conductor size is adjusted when?
The load supplied is a continuous-duty load.
More than three current-carrying conductors are in a raceway.
The ambient temperature surrounding conductors exceeds temperature ratings.
Voltage drop exceeds 3% for feeders or 5% for the combination of the feeder and
branch circuit.
All of the above - CORRECT ANSWER: All of those above
