Licensed Electrical Contractor Electrical Codes & Standards 3

Question 1

Under NEC 310.15, which ambient temperature correction factor applies to THWN-2 conductors installed in an area where the ambient temperature is 50°C?

Accepted Answer

0.58

Answer

For a 75°C-rated conductor (THWN-2) at 50°C ambient, NEC Table 310.15(B)(1) correction factor is 0.58.

Question 2

NEC Article 500 defines hazardous locations. A Class I, Division 2 location is best described as:

Accepted Answer

A location where flammable gases are not normally present but could exist under abnormal conditions

Answer

Class I, Division 2 covers locations where flammable vapors are handled but are not normally present in ignitable concentrations under normal conditions.

Question 3

According to NEC 230.79, the minimum ampacity required for a single-family dwelling service disconnect is:

Accepted Answer

100 amperes

Answer

NEC 230.79(C) requires a minimum 100-ampere service disconnect rating for a single-family dwelling.

Question 4

Under NEC 358.30, EMT must be secured within how many inches of each outlet box, junction box, or other termination?

Accepted Answer

30 inches

Answer

NEC 358.30(A) requires EMT to be secured within 3 feet (36 inches) of each box or termination.

Question 5

NEC 445.13 governs the ampacity of conductors for generators. The minimum conductor ampacity must be at least what percentage of the nameplate current rating?

Accepted Answer

115%

Answer

NEC 445.13 requires generator output conductors to have an ampacity of not less than 115% of the nameplate current rating.

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Practice Test

Licensed Electrical Contractor Electrical Codes & Standards 3