Basic Electrical Standards Flashcards

What does the term 'ampacity' mean as defined in the NEC?

Answer: The current in amperes a conductor can carry continuously under conditions of use

NEC Article 100 defines ampacity as the maximum current a conductor can carry continuously without exceeding its temperature rating.

In a commercial building, where must GFCI protection be provided for 15- and 20-ampere, 125-volt receptacles per the NEC?

Answer: In all outdoor locations, restrooms, and within 6 feet of sinks

NEC 210.8(B) requires GFCI protection in commercial restrooms, outdoors, and within 6 feet of sinks, among other locations.

When applying the 80% continuous load rule, how is the required ampacity of a branch circuit conductor calculated?

Answer: Non-continuous load + (continuous load × 1.25)

NEC 210.19 requires conductors to be sized at 125% of continuous loads plus 100% of non-continuous loads.

What is the minimum size copper conductor required for a branch circuit serving a single 240-volt, 30-ampere receptacle?

Answer: 10 AWG

A 30-ampere circuit requires 10 AWG copper conductors as specified in NEC Table 310.12.

Under the NEC, a 'qualified person' is defined as one who has:

Answer: Skills and knowledge related to the construction and operation of electrical equipment

NEC Article 100 defines a qualified person as having the skills and knowledge related to electrical equipment construction and operation.

What is required when a cable passes through a metal wall stud or joist to prevent damage to the cable?

Answer: A listed bushing or grommet

NEC 300.4(B) requires a listed bushing or grommet when NM cable passes through a metal stud or joist.

Which standard governs the safety requirements for electrical installations in the United States and is the basis for most state and local electrical codes?

Answer: NFPA 70 (NEC)

NFPA 70, the National Electrical Code (NEC), is the primary standard adopted as the basis for US electrical codes.