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NEC Load Calculations (26301-20): Questions/Answers
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NEC Load Calculations (26301-20): Questions/Answers
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NEC Load Calculations (26301-20): Questions/AnswersContinuous loads are calculated at what percentage of the maximum current
rating of the overcurrent protective device? Right Ans - 80%
The NEC requires that the ampacity of branch circuit conductors can be de-
rated when there are more than how many current carrying conductors in a
Raceway? Right Ans - 3
Conductors must be de-rated when installed in conduit _____ . Right Ans -
on or above rooftops
What is the current carrying capacity for number 6 THWN aluminum
conductors in conduit run through an ambient temperature of 38 degrees C?
(96-104 degrees faranheit) Right Ans - Ampacity of aluminum THWN =
50A [NEC Table 310.15(B)(16)] Correction factor = 0.88 [NEC Table
310.15(B)(2)(a)]
•50A x 0.88 = 44A
What is the voltage drop for a 120 Volt single phase two wire branch circuit
100 feet long using copper conductors of 6530 circular mills with a non-
continuous load of 13 amps? Right Ans - •VD = (2 x 100' x 12.9 x 13A) ÷
6,530CM VD = 5.14V
•Calculate the load center length for a 208 Volt four wire three phase branch
circuit with the following fixed non continuous loads
•load A 60 amps at 45 feet from the source
•Load B 40 amps at 60 feet from the source
•load C 30 amps at 75 feet from the source
•load D 25 amps at 100 feet from the source Right Ans - 63.55ft
•Calculate the load center length for a branch circuit consisting of the
following non-continuous loads:
•125 amps at 80 feet from the source
•75 amps at 110 feet from the source
•50 amps at 100 feet from the source Right Ans - 93ft
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