FREE E2 Services, Feeders, Branch Circuits Questions and Answers

Question 1

In a commercial office building, a multiwire branch circuit supplies power to several cubicles. According to NEC 210.4(B), what is required at the point where this branch circuit originates?

Accepted Answer

A means that will simultaneously disconnect all ungrounded conductors.

Answer

A means to individually disconnect each ungrounded conductor.

Answer

A single-pole circuit breaker for each ungrounded conductor.

Answer

An overcurrent device rated for the sum of the connected loads.

Question 2

An inspector is reviewing plans for a commercial kitchen. Which of the following 125-volt, single-phase receptacles requires GFCI protection according to NEC 210.8(B)?

Accepted Answer

A receptacle installed within 6 feet of the top inside edge of a food preparation sink.

Answer

A receptacle for a clock located 8 feet above the floor.

Answer

A receptacle inside a walk-in freezer dedicated to the freezer unit.

Answer

A receptacle located in an adjacent dry storage pantry.

Question 3

A feeder is installed in a commercial building to supply a subpanel. The feeder conductors are protected by a 200A overcurrent device. According to the '25-foot tap rule' in NEC 240.21(B)(2), what is the minimum ampacity required for tap conductors that are 20 feet long?

Accepted Answer

67A

Answer

50A

Answer

100A

Answer

200A

Question 4

A commercial service is calculated to supply a continuous load of 160A and a noncontinuous load of 80A. Per NEC 230.42(A), what is the minimum required ampacity for the service-entrance conductors?

Accepted Answer

280A

Answer

240A

Answer

200A

Answer

300A

Question 5

Which of the following is a requirement for identifying the grounded conductor of a feeder, according to NEC 215.12(A)?

Accepted Answer

It must be identified in accordance with the methods specified in NEC 200.6.

Answer

It must be identified with green tape at all termination points.

Answer

It must be larger in size than the ungrounded conductors.

Answer

It must be bonded to the equipment grounding conductor within the panelboard it supplies.

Question 6

During a commercial building inspection, you observe a feeder supplying a separate building. Which NEC article must be consulted to ensure the grounding and bonding requirements at the separate building are met?

Accepted Answer

Article 250 - Grounding and Bonding

Answer

Article 210 - Branch Circuits

Answer

Article 230 - Services

Answer

Article 240 - Overcurrent Protection