CEI Branch Circuit & Feeder Inspection 2

Question 1

Which NEC article governs the installation requirements for feeders, including their overcurrent protection and conductor sizing?

Accepted Answer

Article 215

Answer

NEC Article 215 covers feeders — the conductors and equipment between the service equipment and the final branch circuit overcurrent devices.

Question 2

Per NEC 215.2(A)(1), feeder conductor ampacity must be not less than which of the following?

Accepted Answer

100% of non-continuous load plus 125% of continuous load

Answer

NEC 215.2(A)(1) requires feeder ampacity to equal 100% of non-continuous loads plus 125% of continuous loads to account for heat buildup during sustained operation.

Question 3

Under the 10-foot feeder tap rule per NEC 240.21(B)(1), which condition must be met for a tap conductor to be installed without overcurrent protection at the tap point?

Accepted Answer

The tap conductor must not exceed 10 feet and terminate in a single OCPD

Answer

Per NEC 240.21(B)(1), tap conductors not over 10 feet must be enclosed, not over 10 feet long, and terminate in a single circuit breaker or set of fuses that limit the load to the tap conductor's ampacity.

Question 4

Which conductor in a feeder must be identified by white or gray insulation, or three continuous white stripes for sizes 6 AWG and smaller per NEC 200.6?

Accepted Answer

Grounded (neutral) conductor

Answer

NEC 200.6 requires grounded conductors (neutral) 6 AWG and smaller to be identified by continuous white or gray insulation, or three continuous white stripes.

Question 5

Per NEC 230.79(C), what is the minimum rating for the service disconnect for a single-family dwelling unit?

Accepted Answer

100 amperes, 3-wire

Answer

NEC 230.79(C) mandates a minimum 100-ampere, 3-wire service disconnect for single-family dwellings to accommodate modern electrical loads.

(CEI) Certified Electrical Inspector Practice Test

(CEI) Certified Electrical Inspector Practice Test

CEI Branch Circuit & Feeder Inspection 2