Overcurrent Protection & Grounding Flashcards

According to NEC 240.4(D), what is the maximum overcurrent protection permitted for 14 AWG copper conductors?

Answer: 15 amperes

NEC 240.4(D) limits overcurrent protection for 14 AWG copper to 15 amperes regardless of the conductor's ampacity.

What NEC article governs the use of ground-fault circuit-interrupter (GFCI) protection?

Answer: Article 210

Article 210 covers branch circuits, including the GFCI protection requirements for receptacles in wet and damp locations.

What is the minimum size copper equipment grounding conductor (EGC) required for a circuit protected by a 60-ampere overcurrent device per NEC Table 250.122?

Answer: 10 AWG

NEC Table 250.122 requires a minimum 10 AWG copper EGC for circuits protected at 60 amperes.

Under NEC 250.24(A), a service-entrance grounded conductor (neutral) must be connected to the grounding electrode system at which location?

Answer: At the service disconnecting means enclosure

NEC 250.24(A) requires the grounded conductor to be bonded to the grounding electrode system at the service disconnecting means.

A 20-ampere, 120-volt branch circuit breaker trips repeatedly under normal load. Per NEC principles, what is the FIRST corrective action?

Answer: Evaluate the actual load versus the circuit's rated capacity

NEC requires conductors and overcurrent devices to be properly sized for the load; the load must be evaluated before upsizing protection.

What does NEC 250.119 require regarding identification of equipment grounding conductors?

Answer: Continuous green color or green with yellow stripes, or bare

NEC 250.119 requires EGCs to be identified by green insulation, green with yellow stripe, or bare copper.

Per NEC 240.21(B)(1), a tap conductor from a feeder must not exceed what length when not otherwise protected at its point of supply?

Answer: 10 feet

NEC 240.21(B)(1) allows tap conductors up to 10 feet without overcurrent protection at the tap point if specific conditions are met.