Branch Circuit & Feeder Inspection Flashcards

Which NEC article specifically covers the installation requirements for branch circuits in dwelling units and commercial buildings?

Answer: Article 210

NEC Article 210 covers branch circuits, including ratings, required circuits, and outlet placement requirements.

What is the maximum load permitted on a 20-ampere branch circuit that supplies continuous loads, per the 80% rule?

Answer: 16 amperes

Per NEC 210.19(A)(1), continuous loads must not exceed 80% of the branch circuit rating, so 20A × 80% = 16A maximum.

Per NEC 210.11(C)(1), how many small appliance branch circuits are required to serve the kitchen receptacle outlets in a dwelling unit?

Answer: Two 20-ampere circuits

NEC 210.11(C)(1) requires at least two 20-ampere small appliance branch circuits to serve kitchen, dining room, and similar areas.

What is the minimum conductor size (AWG copper) permitted for a 20-ampere branch circuit?

Answer: 12 AWG

Per NEC 210.19(A) and Table 310.16, 12 AWG copper is the minimum conductor size rated for use on 20-ampere branch circuits.

Per NEC Article 100, an individual branch circuit is defined as one that:

Answer: Supplies only one piece of utilization equipment

An individual branch circuit, as defined in NEC Article 100, is a branch circuit that supplies only one piece of utilization equipment.

Combination-type AFCI protection is required by the 2020 NEC for 120-volt, 15- and 20-ampere branch circuits in which locations of a dwelling unit?

Answer: All habitable rooms and specified areas

The 2020 NEC 210.12(A) expanded AFCI requirements to cover all 120V, 15- and 20-ampere branch circuit outlets in virtually all areas of dwelling units.

What is the maximum overcurrent device rating permitted for a 15-ampere branch circuit per NEC 210.3?

Answer: 15 amperes

NEC 210.3 states the rating of a branch circuit is determined by the rating of the overcurrent device, so a 15-ampere branch circuit may not exceed a 15-ampere OCPD.