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

0.71

Answer

0.82

Answer

0.91

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

A location where flammable gases are present continuously

Answer

A location where flammable liquids are handled in open containers

Answer

A location where combustible dust is present continuously

Question 3

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

Accepted Answer

100 amperes

Answer

60 amperes

Answer

150 amperes

Answer

200 amperes

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

18 inches

Answer

24 inches

Answer

36 inches

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

100%

Answer

125%

Answer

150%

Question 6

Which NEC article covers the installation requirements for transformer secondary conductors?

Accepted Answer

Article 450

Answer

Article 240

Answer

Article 310

Answer

Article 215

Question 7

Under NEC 680.22, a receptacle installed outdoors within 20 feet of a swimming pool must be:

Accepted Answer

GFCI protected

Answer

On a dedicated 20A circuit

Answer

AFCI protected

Answer

At least 10 feet above grade