Journeyman Electrician’s Exam Journeyman Electrician's Boxes and Enclosures

Question 1

According to NEC Table 314.16(B), what is the volume allowance assigned to each 14 AWG conductor for box fill calculations?

Accepted Answer

2.00 cubic inches

Answer

1.75 cubic inches

Answer

2.25 cubic inches

Answer

2.50 cubic inches

Question 2

Per NEC 314.16(B)(4), how does a duplex receptacle (wiring device) count in a box fill calculation?

Accepted Answer

Two conductors based on the largest AWG in the box

Answer

One conductor based on the largest AWG in the box

Answer

Three conductors based on the largest AWG in the box

Answer

Devices are exempt from box fill requirements

Question 3

Per NEC 314.16(B)(5), all equipment grounding conductors (EGCs) inside a box collectively count as how many conductors in box fill?

Accepted Answer

One conductor based on the largest EGC present

Answer

Zero — EGCs are exempt from fill calculations

Answer

One conductor per each individual EGC

Answer

Two conductors based on the largest EGC present

Question 4

A 4-inch square metal box 1-1/2 inches deep has a listed volume of 21 cubic inches. Using only 12 AWG conductors (no devices or clamps), how many conductors are permitted?

Accepted Answer

9 conductors

Answer

7 conductors

Answer

11 conductors

Answer

14 conductors

Question 5

Per NEC 314.16(B)(2), how do all internal cable clamps inside a box count toward box fill?

Accepted Answer

One conductor (all clamps together) based on the largest AWG in the box

Answer

Zero — internal clamps are not counted

Answer

One conductor per clamp based on the largest AWG

Answer

Two conductors total for all clamps combined

Question 6

A box contains three 14 AWG conductors, one duplex receptacle, and one equipment grounding conductor. What is the minimum required box volume?

Accepted Answer

12.00 cubic inches

Answer

8.00 cubic inches

Answer

10.00 cubic inches

Answer

14.00 cubic inches

Question 7

Per NEC 314.16(B)(1), a conductor that passes through a box without any splice or termination counts in box fill as:

Accepted Answer

One conductor

Answer

Zero — pass-through conductors are not counted

Answer

Two conductors (once for entering, once for exiting)

Answer

Only counted if the conductor is larger than 10 AWG