Question 1

What is the NEC definition of 'grounding'?

Accepted Answer

Grounding is the intentional connection of a conductor to the earth or to a conductive body that serves in place of the earth, establishing a reference potential.

Question 2

What is the NEC definition of 'bonding'?

Accepted Answer

Bonding is the permanent joining of metallic parts to form an electrically conductive path that ensures electrical continuity and the capacity to conduct safely any current likely to be imposed.

Question 3

What is the difference between the grounded conductor and the grounding conductor?

Accepted Answer

The grounded conductor (neutral) is intentionally connected to ground and carries return current under normal operation. The grounding conductor (EGC) is a safety conductor that does not carry current under normal conditions but provides a fault current path.

Question 4

What is a 'grounding electrode system'?

Accepted Answer

A grounding electrode system is the network of all grounding electrodes present at a building or structure that are bonded together to form a single grounding system, as required by NEC Article 250.

Question 5

What is the purpose of the main bonding jumper (MBJ)?

Accepted Answer

The main bonding jumper connects the grounded (neutral) conductor to the equipment grounding conductor and the grounding electrode conductor at the service equipment, completing the ground-fault current path.

Grounding & Bonding – Electrician Journeyman Exam

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