CEI CEI Service Entrance & Metering Inspection 2

Question 1

During a meter socket inspection, an inspector finds the meter enclosure is not bonded to the service-entrance neutral. What NEC section requires this bonding?

Accepted Answer

NEC 250.92

Answer

NEC 250.92 requires that the service enclosures, including meter enclosures, be bonded to the service neutral (grounded conductor) at the service entrance.

Question 2

What is the purpose of the main bonding jumper at the service equipment?

Accepted Answer

To connect the neutral conductor to the equipment grounding conductor

Answer

Per NEC 250.24(B), the main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor and service equipment enclosure at the service disconnect.

Question 3

An inspector finds a service rated at 200A with a service-entrance conductor of 2/0 AWG copper. Under NEC 310.15, is this conductor adequately sized?

Accepted Answer

Yes, 2/0 AWG copper is adequate for 200A under the 83% rule

Answer

NEC 310.15(B)(7) permits 2/0 AWG copper (rated 175A) to serve as a 200A service conductor when it supplies a dwelling unit service.

Question 4

Which of the following is NOT a permitted grounding electrode per NEC 250.52?

Accepted Answer

A steel well casing that is not bonded to water supply piping

Answer

NEC 250.52(A) lists acceptable grounding electrodes; a steel well casing alone, without meeting specific criteria for other electrode types, is not a listed grounding electrode.

Question 5

During a service entrance inspection, what is the required minimum burial depth for a service lateral installed in rigid metal conduit (RMC)?

Accepted Answer

12 inches

Answer

Per NEC Table 300.5, RMC and IMC installed as direct-buried service laterals require a minimum cover of 6 inches, but when under a building slab or in RMC, 6 inches is the minimum; general direct burial of RMC requires only 6 inches — however standard NEC Table 300.5 specifies 6 inches for RMC.

(CEI) Certified Electrical Inspector Practice Test

(CEI) Certified Electrical Inspector Practice Test

CEI CEI Service Entrance & Metering Inspection 2