Licensed Electrical Contractor Licensed Electrical Contractor Wiring Methods and Materials Questions and Answers 3

Question 1

What is the minimum trade size of EMT permitted to be installed per NEC 358.20?

Accepted Answer

1/2 inch

Answer

NEC 358.20(A) specifies that the minimum trade size for EMT is metric designator 16 (1/2 inch).

Question 2

Per NEC 334.80, what is the maximum ambient temperature rating for standard Type NM cable?

Accepted Answer

90°C

Answer

NEC 334.80 states that Type NM cable is rated at 90°C but the ampacity must be based on the 60°C column per the conductor temperature limitation.

Question 3

Which of the following wiring methods is NOT permitted in a commercial garage as defined by NEC Article 511?

Accepted Answer

Type NM cable

Answer

NEC 511.4 does not permit Type NM cable in commercial garages because these locations require wiring methods suitable for hazardous or industrial environments.

Question 4

What is the maximum number of quarter bends (90-degree bends) permitted between pull points in a raceway per NEC 300.14?

Accepted Answer

Four

Answer

NEC 300.18 limits the total number of bends between pull points to the equivalent of four quarter bends (360 degrees total).

Question 5

When splicing conductors inside a junction box, what is the minimum volume allowance per conductor for a 12 AWG wire per NEC Table 314.16(B)?

Accepted Answer

2.25 cubic inches

Answer

NEC Table 314.16(B) assigns a volume allowance of 2.25 cubic inches for each 12 AWG conductor in box fill calculations.

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Licensed Electrical Contractor Wiring Methods and Materials Questions and Answers 3