CEI Grounding & Bonding Requirements 3

Question 1

At a subpanel (remote distribution panel), the neutral bus and ground bus must be:

Accepted Answer

Separated and not connected

Answer

At a subpanel, the neutral and ground buses must be kept separate to prevent objectionable current from flowing on grounding conductors per NEC 250.142.

Question 2

What minimum burial depth is required for a ground rod electrode?

Accepted Answer

8 feet

Answer

NEC 250.53(G) requires ground rods to be driven to a depth of at least 8 feet in contact with the soil.

Question 3

Which conductor is used to connect the grounding electrode to the grounded service conductor or equipment?

Accepted Answer

Grounding electrode conductor

Answer

The grounding electrode conductor (GEC) is the conductor that connects the grounding electrode system to the grounded conductor or equipment per NEC Article 100.

Question 4

Bonding of metal gas piping is required when the piping system could become energized. The bond must be connected to:

Accepted Answer

The equipment grounding conductor or grounded service conductor

Answer

Per NEC 250.104(B), metal gas piping must be bonded to the service equipment enclosure, grounded conductor at the service, or grounding electrode conductor.

Question 5

What is the minimum size copper grounding electrode conductor for a service with 3/0 AWG copper service-entrance conductors per NEC Table 250.66?

Accepted Answer

2 AWG

Answer

Per NEC Table 250.66, service-entrance conductors of 2/0–3/0 AWG copper require a minimum 2 AWG copper grounding electrode conductor.

(CEI) Certified Electrical Inspector Practice Test

(CEI) Certified Electrical Inspector Practice Test

CEI Grounding & Bonding Requirements 3