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

Article 210

Answer

Article 220

Answer

Article 225

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

80% of the total calculated load

Answer

125% of the total calculated load

Answer

100% of the total calculated load

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

The tap conductor must be in a raceway

Answer

The tap conductor ampacity must not be less than the feeder OCPD rating

Answer

The tap must not exceed 10 feet and have an ampacity of at least 1/10 the feeder OCPD rating

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

Ungrounded (hot) conductor

Answer

Equipment grounding conductor

Answer

High-leg conductor

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

60 amperes, 2-wire

Answer

150 amperes, 3-wire

Answer

200 amperes, 3-wire

Question 6

When a feeder is tapped under the 25-foot tap rule (NEC 240.21(B)(2)), what is the minimum ampacity required for the tap conductor?

Accepted Answer

Not less than 1/3 the ampere rating of the feeder OCPD

Answer

Not less than 1/2 the ampere rating of the feeder OCPD

Answer

Equal to the feeder OCPD ampere rating

Answer

Not less than 1/10 the ampere rating of the feeder OCPD

Question 7

An inspector finds that feeder conductors supplying a panelboard are routed through a wall without any protection. The feeder is not in conduit and passes within 1.25 inches of the edge of a wood stud. What violation exists?

Accepted Answer

The conductors require nail plates per NEC 300.4(A)(1)

Answer

No violation; feeders do not require protection

Answer

The feeder must be installed in conduit per NEC 215.6

Answer

The conductors must be increased one wire gauge