
2.

The ampacity of a conductor is defined by the NEC to be the maximum current, in amperes, a conductor can carry continuously under the conditions of use without exceeding ______.


















You will find this definition in Article 100 of the NEC. To get a better understanding of ampacity, perhaps we might consider it as currentcarrying capacity, or the maximum amperage a conductor can carry continuously without damaging the conductor and/or its insulation. When determining the ampacity of a conductor, or sizing a conductor, some factors needed to be taken into consideration are, the ambient temperature, the number of currentcarrying conductors contained in the raceway or cable, the temperature rating of the terminations and the environment the conductor will be subject to.
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60.

When terminating conductor sizes 14 AWG through 1 AWG on circuit breakers, the conductors shall be considered to have a temperature rating of ______, unless the circuit breakers are listed and marked otherwise.


















Section 110.14(C)(1)(a) requires that conductor terminations, as well as conductors, be rated for the operating temperature of the circuit. In other words, conductors must be sized to the lowest temperature rating of the wire, circuit breaker terminal, or device. In compliance with Section 110.14(C)(1)(a)(1), when terminating conductor sizes 14 AWG through 1 AWG on circuit breakers, unless the circuit breakers are marked and otherwise listed, the conductors have a temperature rating of 60C.
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88.

When grounding the structural reinforcing steel of a swimming pool, what is the smallest size grounding conductor permitted for this installation?


















The intent of Section 680.26(B) is to ensure all metals parts of a swimming pool, such as the structural reinforcing steel and metal ladders, as well as metal components surrounding the pool, such as fences, be bonded together by use of a size 8 AWG, or larger, bare, solid, copper conductor.
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93.

Given: A metal junction box has a volume of 27 cubic inches and contains a total of six (6) size 12 AWG conductors, no grounding conductors, devices or fittings are contained in the box. Additional wires of size 10 AWG need to be added in the box. What is the MAXIMUM number of size 10 AWG conductors may be added to this box?


















To determine how many conductors may be added to a junction box, first find the volume, in cubic inches, of the existing conductors in the box by applying the values, in cubic inches, as shown on Table 314.16(B). Size 12 AWG = 2.25 cu. in. x 6 (existing wire in box) = 13.5 cu. in. Next, subtract the cu. in. volume of the existing wires in the box from the allowable fill of the box to find the remaining space available.
27.0 cu. in. (allowable fill of box)
13.5 cu. in. (existing wire in box)
13.5 cu. in. (remaining space available)
Then, divide the remaining space available by the cu. in. volume of the size10 AWG conductors to be added.
13.5 cu. in. (remaining space) = 5.4 = 5 size 10 AWG wires may be added
2.5 cu. in. (10 AWG)
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