IEC Grounding and Bonding 2

Question 1

What is the minimum size copper equipment grounding conductor required for a 60-ampere circuit per NEC Table 250.122?

Accepted Answer

#8 AWG

Answer

NEC Table 250.122 requires a minimum #8 AWG copper equipment grounding conductor for circuits rated up to 60 amperes.

Question 2

Which NEC article specifically covers grounding and bonding requirements?

Accepted Answer

Article 250

Answer

NEC Article 250 contains all general requirements for grounding and bonding of electrical installations.

Question 3

A main bonding jumper in a service panel connects which two components?

Accepted Answer

The neutral (grounded) conductor to the equipment grounding conductor

Answer

The main bonding jumper connects the neutral (grounded) conductor to the equipment grounding conductor at the service entrance.

Question 4

When is it permitted to connect the neutral bar and ground bar together in a subpanel?

Accepted Answer

Never — neutral and ground must always be separate in subpanels

Answer

In a subpanel (remote distribution panel), the neutral and equipment grounding conductors must always be kept separate to prevent objectionable current on grounding paths.

Question 5

What is the purpose of a grounding electrode system?

Accepted Answer

To establish a reference voltage to earth and limit voltage imposed by lightning or line surges

Answer

The grounding electrode system establishes a reference to earth potential and limits voltages imposed by lightning, line surges, or unintentional contact with higher-voltage lines.

IEC - Independent Electrical Contractors Practice Test

IEC - Independent Electrical Contractors Practice Test

IEC Grounding and Bonding 2