Electrician Grounding and Bonding 3

Question 1

Per NEC Table 250.122, what is the minimum size copper equipment grounding conductor required for a circuit protected by a 20-ampere overcurrent device?

Accepted Answer

12 AWG

Answer

NEC Table 250.122 specifies that a 20-ampere overcurrent device requires a minimum 12 AWG copper equipment grounding conductor.

Question 2

In which location is it NOT permissible to connect neutral conductors and equipment grounding conductors together?

Accepted Answer

At a remote subpanel fed from the same service

Answer

Per NEC 250.142(B), neutral and equipment grounding conductors must not be interconnected at remote panelboards supplied from the same service.

Question 3

Which NEC article contains all of the requirements for grounding and bonding of electrical systems and equipment?

Accepted Answer

Article 250

Answer

NEC Article 250 is dedicated entirely to grounding and bonding requirements and is one of the most referenced articles on electrician licensing exams.

Question 4

Per NEC 250.52(A)(1), a metal underground water pipe used as a grounding electrode must have at least how many feet of direct earth contact?

Accepted Answer

10 feet

Answer

NEC 250.52(A)(1) requires a metal underground water pipe to be in direct contact with the earth for at least 10 feet to qualify as a grounding electrode.

Question 5

What is the primary purpose of a grounding electrode system?

Accepted Answer

To connect the electrical system to earth to stabilize voltage and dissipate lightning and transient surges

Answer

The grounding electrode system connects the electrical system to earth to stabilize voltages to ground and safely dissipate lightning and transient overvoltages.

Electrician Practice Test

Electrician Practice Test

Electrician Grounding and Bonding 3