Journeyman Electrician’s Exam Journeyman Electrician's Grounding and Bonding 3

Question 1

At a separately derived system, the grounding electrode conductor must be connected to the:

Accepted Answer

Neutral point of the derived system

Answer

Per NEC 250.30(A), the grounding electrode conductor for a separately derived system connects to the neutral (grounded) point of that system.

Question 2

A main bonding jumper is required at the:

Accepted Answer

Service entrance equipment only

Answer

The main bonding jumper connects the grounded conductor to the equipment grounding conductor and is required only at the service entrance equipment.

Question 3

Which conductor connects metal parts of equipment to the equipment grounding conductor or grounding electrode?

Accepted Answer

Equipment bonding jumper

Answer

An equipment bonding jumper connects metal parts of equipment to ensure they are at ground potential and part of the fault current path.

Question 4

For a 200A service, what is the minimum size copper grounding electrode conductor required per NEC Table 250.66?

Accepted Answer

4 AWG

Answer

Per NEC Table 250.66, for service entrance conductors of 3/0 AWG copper (typical for 200A), a 4 AWG copper GEC is required.

Question 5

What is the minimum burial depth for a ground rod electrode per NEC 250.53(G)?

Accepted Answer

8 feet

Answer

Per NEC 250.53(G), rod and pipe electrodes must be installed so at least 8 feet of length is in contact with the soil.

Journeyman Electrician’s Exam Practice Test