FREE E2 Grounding and Bonding Questions and Answers

Question 1

What is the minimum size copper grounding electrode conductor (GEC) required for a service with 500 kcmil copper ungrounded service-entrance conductors?

Accepted Answer

1/0 AWG

Answer

2 AWG

Answer

1 AWG

Answer

2/0 AWG

Question 2

A grounding electrode conductor is connected only to a concrete-encased electrode (Ufer ground). What is the largest size copper conductor required for this connection?

Accepted Answer

4 AWG

Answer

6 AWG

Answer

2 AWG

Answer

1/0 AWG

Question 3

Which of the following, if present and meeting the required specifications, MUST be used as part of the grounding electrode system for a commercial building?

Accepted Answer

A metal underground water pipe

Answer

An interior metal water pipe

Answer

A metal underground gas piping system

Answer

The aluminum siding of the building

Question 4

What is the minimum size copper equipment grounding conductor (EGC) required for a branch circuit protected by a 400-ampere circuit breaker?

Accepted Answer

3 AWG

Answer

4 AWG

Answer

2 AWG

Answer

1 AWG

Question 5

On the load side of the service disconnect, which conductor is generally prohibited from being used to ground the metal frame of equipment?

Accepted Answer

The grounded conductor

Answer

The equipment grounding conductor

Answer

A bonding jumper

Answer

The grounding electrode conductor

Question 6

A commercial service is supplied by 3/0 AWG copper conductors. What is the minimum size copper bonding jumper required to bond the interior metal water piping system to the service equipment?

Accepted Answer

4 AWG

Answer

6 AWG

Answer

2 AWG

Answer

3/0 AWG