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

16 AWG

Answer

14 AWG

Answer

10 AWG

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

At the service equipment panel

Answer

At the source of a separately derived system

Answer

At an outdoor transformer secondary used as a separately derived system

Question 3

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

Accepted Answer

Article 250

Answer

Article 230

Answer

Article 240

Answer

Article 300

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

5 feet

Answer

8 feet

Answer

15 feet

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

To limit fault current magnitude in branch circuits

Answer

To provide the normal current return path from loads back to the source

Answer

To increase the impedance of the neutral conductor

Question 6

The conductor that runs from the grounding electrode system to the neutral conductor at the service equipment is called the:

Accepted Answer

Grounding electrode conductor (GEC)

Answer

Equipment grounding conductor (EGC)

Answer

Main bonding jumper

Answer

System bonding jumper

Question 7

Per NEC Table 250.66, what is the maximum copper grounding electrode conductor size required regardless of how large the service entrance conductors are?

Accepted Answer

3/0 AWG copper

Answer

2/0 AWG copper

Answer

250 kcmil copper

Answer

4/0 AWG copper