Electrical Codes & Standards Flashcards

According to NEC 230.9, service conductors must maintain a minimum clearance of how many inches from windows that are designed to be opened?

Answer: 36 inches

NEC 230.9 requires service conductors to be at least 3 feet (36 inches) from windows, doors, porches, and similar openings.

Which NEC article covers the special requirements for electrical installations in Class I, Division 1 hazardous locations?

Answer: Article 501

NEC Article 501 specifically covers Class I (flammable gas/vapor) hazardous locations in Divisions 1 and 2.

Under NEC 210.8, GFCI protection is required for all 15A and 20A, 125V receptacles in which residential location?

Answer: All unfinished basement areas

NEC 210.8(A)(5) requires GFCI protection for all 125V, 15 and 20A receptacles in unfinished basement areas of dwelling units.

What is the minimum conductor insulation temperature rating required when conductors are connected to a 75°C-rated terminal on a circuit breaker?

Answer: 75°C

The conductor insulation must be rated at least equal to the terminal rating, so a 75°C terminal requires at minimum a 75°C-rated conductor.

Per NEC 314.28, for a conduit containing 600V conductors with a 2-inch trade-size conduit, what is the minimum pull box length for a straight pull?

Answer: 8 times the trade-size diameter

NEC 314.28(A)(1) requires pull boxes to be at least 8 times the trade-size diameter for straight pulls.

Under NFPA 70E, a shock hazard analysis must determine the voltage, arc flash boundary, and what other parameter?

Answer: Limited approach boundary and restricted approach boundary

NFPA 70E 130.4 requires shock hazard analysis to establish both the limited approach boundary and the restricted approach boundary.

Which IEEE standard covers the testing and performance of grounding systems for electric power substations?

Answer: IEEE 80

IEEE Std 80 is the guide for safety in AC substation grounding, covering design and testing of grounding systems.