E2 Services, Feeders, Branch Circuits 2

Question 1

What is the minimum ampacity required for a service entrance conductor supplying a single commercial occupancy with a calculated load of 175 amperes?

Accepted Answer

175 amperes

Answer

Service conductors must have an ampacity not less than the calculated load per NEC 230.42.

Question 2

Per NEC Article 230, how many sets of service entrance conductors are permitted to supply a single building from a single service drop?

Accepted Answer

Up to six sets under specific conditions

Answer

NEC 230.40 permits up to six sets of service entrance conductors from a single service drop or lateral under defined conditions.

Question 3

A commercial feeder supplies a panelboard with a total computed load of 92 amperes. What is the minimum conductor ampacity allowed?

Accepted Answer

92 amperes

Answer

Feeder conductors must have an ampacity not less than the load they supply per NEC 215.2(A).

Question 4

What NEC section governs the minimum size of branch circuit conductors for general lighting loads?

Accepted Answer

NEC 210.19

Answer

NEC 210.19 specifies the minimum ampacity and size of branch circuit conductors.

Question 5

A 120/240V, single-phase service for a commercial building requires a grounded (neutral) conductor. Per NEC 230.42, the neutral must have an ampacity of at least:

Accepted Answer

The full unbalanced load

Answer

The grounded service conductor must be sized to carry the maximum unbalanced load per NEC 220.61.

(E2) E2 Commercial Electrical Inspector Practice Test

(E2) E2 Commercial Electrical Inspector Practice Test

E2 Services, Feeders, Branch Circuits 2