Electrical Codes & Standards Flashcards
7 cards from real Licensed Electrical Contractor practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Electrical Codes & Standards flashcards as text
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?
Answer: 0.58
For a 75°C-rated conductor (THWN-2) at 50°C ambient, NEC Table 310.15(B)(1) correction factor is 0.58.
NEC Article 500 defines hazardous locations. A Class I, Division 2 location is best described as:
Answer: A location where flammable gases are not normally present but could exist under abnormal conditions
Class I, Division 2 covers locations where flammable vapors are handled but are not normally present in ignitable concentrations under normal conditions.
According to NEC 230.79, the minimum ampacity required for a single-family dwelling service disconnect is:
Answer: 100 amperes
NEC 230.79(C) requires a minimum 100-ampere service disconnect rating for a single-family dwelling.
Under NEC 358.30, EMT must be secured within how many inches of each outlet box, junction box, or other termination?
Answer: 30 inches
NEC 358.30(A) requires EMT to be secured within 3 feet (36 inches) of each box or termination.
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?
Answer: 115%
NEC 445.13 requires generator output conductors to have an ampacity of not less than 115% of the nameplate current rating.
Which NEC article covers the installation requirements for transformer secondary conductors?
Answer: Article 450
NEC Article 450 covers transformers and transformer vaults, including secondary conductor installation requirements.
Under NEC 680.22, a receptacle installed outdoors within 20 feet of a swimming pool must be:
Answer: GFCI protected
NEC 680.22(A)(1) requires all receptacles within 20 feet of the inside wall of a pool to be GFCI protected.