Question

sizing device boxesuse the information below to answer the question.when sizing device boxes, it is important to consider how many conductors can fit inside of the box. the more conductors in a device box, the hotter it will get and the more dangerous it will be. the national electrical code (nec) sets standards for box-fill calculations. in annex c of the nec, the details of how much cubic space is allowed for different sized conductors are discussed. this article also talks about different conductors and their conductor equivalents.different items have different cubic inch volumes when in a device box:- one conductor entering or through a box = 1- cable ties less than 12 inches = 1- cable ties over 12 inches = 2- one clamp = 1- one equipment studs or devices = 1- one strap = 2- one grounding conductors = 1adding up the cubic inches for each conductor in a device box and comparing it to the total cubic inches for the box will show if there is enough space.if a device box has 1 strap, 1 grounding conductor, and one pigtail, what is the value of its conductors?5173

Explanation:

Step1: Assign values to components

From NEC box-fill rules:

• Strap (device stud) = 1 conductor equivalent
• Grounding conductor = 1 conductor equivalent
• Pigtail (short conductor <12 inches) = 1 conductor equivalent

Step2: Sum the equivalents

$\text{Total conductors} = 1 + 1 + 1$

Answer:

3