Electrical Codes & Standards Flashcards

Under NEC 230.79, what is the minimum ampere rating for a one-family dwelling service disconnect?

Answer: 100 amperes

NEC 230.79(C) requires a minimum 100-ampere, 3-wire service for one-family dwellings.

What is the purpose of NEC Article 90?

Answer: To establish the purpose, scope, and enforcement of the NEC

NEC Article 90 establishes the purpose, scope, organization, and enforcement authority of the entire Code.

Per NEC 406.9, which receptacle type is required for outdoor wet locations that may have a cord plugged in while in use?

Answer: In-use (extra-duty) weatherproof cover with WR receptacle

NEC 406.9(B)(1) requires an 'in-use' weatherproof cover (extra-duty) for outdoor wet locations where a cord may remain inserted.

Which NEC article covers the installation of transformers?

Answer: Article 450

NEC Article 450 covers the installation of transformers and transformer vaults, including clearance and overcurrent protection requirements.

Under NEC 215.2, what is the minimum ampacity of feeder conductors for a residential single-family dwelling?

Answer: 100 amperes

NEC 215.2(A)(3) requires feeder conductors serving a single-family dwelling to have an ampacity of not less than 100 amperes, 3-wire.

What does UL listing of electrical equipment primarily indicate?

Answer: The equipment has been tested and found to meet specific safety standards

A UL listing mark indicates that samples of the equipment have been tested by Underwriters Laboratories and found to meet specific safety standards.

Per NEC 310.15, what adjustment factor must be applied when more than three current-carrying conductors are bundled together in a raceway?

Answer: A derating factor from NEC Table 310.15(C)(1) must be applied

NEC 310.15(C)(1) requires applying adjustment factors from Table 310.15(C)(1) when more than three current-carrying conductors are in a raceway or cable.