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Math Calculations: Box Fill

38 question stems · Page 2 of 2

Question 31

According to NEC Article 314, when calculating the minimum volume of an outlet box containing three $12 \text{ AWG}$ conductors, two grounding conductors, and one single-pole switch, how many volume allowances must be made for the conductors?

Question 32

What is the purpose of box fill calculations when installing conductors in device boxes?

Question 33

A junction box contains four 14 AWG insulated conductors (two hots and two neutrals), one 14 AWG equipment grounding conductor, and one internal cable clamp. For box fill calculation purposes, how many 14 AWG conductor equivalents are counted?

Question 34

What is the maximum number of 12 AWG conductors allowed in a 4-inch square box that is 1.5 inches deep (21.0 cu in volume), assuming no devices or clamps? (Each 12 AWG = 2.25 cu in)

Question 35

When calculating box fill, how many volume allowances must be deducted for one duplex receptacle device?

Question 36

When calculating box fill, how many conductor volume allowances must be deducted for each internal cable clamp?

Question 37

When determining box fill, each 12 AWG conductor counts as:

Question 38

What is the minimum volume allowance required per 12 AWG conductor in a metal box?