Journeyman Electrician’s Exam Journeyman Electrician's Grounding and Bonding 5

Question 1

Metal gas piping in a building must be bonded per NEC 250.104(B) to which of the following?

Accepted Answer

The equipment grounding conductor of the circuit likely to energize the piping

Answer

Per NEC 250.104(B), interior metal gas piping must be bonded to the equipment grounding conductor of the circuit that is most likely to energize the piping.

Question 2

What is the maximum size copper equipment grounding conductor that may be bare (uninsulated) when installed in a raceway?

Accepted Answer

Any size may be bare in a raceway

Answer

Per NEC 250.119, equipment grounding conductors of any size may be bare, covered, or insulated when installed in a raceway.

Question 3

A patient care area in a hospital requires what type of grounding system per NEC 517?

Accepted Answer

An isolated (ungrounded) power system with a line isolation monitor

Answer

NEC Article 517 requires critical care areas to use an isolated (ungrounded) power system with a line isolation monitor to allow the circuit to continue operating during a first fault.

Question 4

Which of the following correctly describes the difference between grounding and bonding?

Accepted Answer

Grounding connects equipment to earth; bonding connects conductive parts to each other

Answer

Grounding connects the electrical system to earth (the grounding electrode system), while bonding connects conductive parts together to ensure electrical continuity.

Question 5

When a panelboard is used as service equipment, the equipment grounding terminal bar must be bonded to the enclosure using a:

Accepted Answer

Main bonding jumper

Answer

At service equipment, the main bonding jumper connects the neutral (grounded conductor) terminal bar to the equipment enclosure and the EGC terminal bar.

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Practice Test

Journeyman Electrician’s Exam Journeyman Electrician's Grounding and Bonding 5