FREE Journeyman Electrician’s Grounding and Bonding Questions and Answers

Question 1

According to NEC Article 250, which of the following is the primary purpose of bonding?

Accepted Answer

To establish an effective ground-fault current path.

Answer

To limit voltage imposed by lightning or line surges.

Answer

To stabilize the voltage to earth during normal operation.

Answer

To connect the electrical system to a grounding electrode.

Question 2

An electrician is installing a 200A service with 3/0 AWG copper service-entrance conductors. The grounding electrode is a single ground rod. What is the minimum size copper grounding electrode conductor (GEC) required?

Accepted Answer

6 AWG

Answer

4 AWG

Answer

2 AWG

Answer

8 AWG

Question 3

A feeder is protected by a 60-ampere overcurrent device. If the ungrounded conductors are increased in size from 10 AWG to 6 AWG copper for voltage drop, what is the minimum size required for the wire-type copper equipment grounding conductor (EGC)?

Accepted Answer

10 AWG

Answer

8 AWG

Answer

6 AWG

Answer

4 AWG

Question 4

In a building with a metal underground water pipe in direct contact with the earth for 20 feet and an available metal in-ground support structure, which of the following is required by the NEC for the grounding electrode system?

Accepted Answer

Bond both the water pipe and the support structure together.

Answer

Use only the metal water pipe as the grounding electrode.

Answer

Use only the building steel as the grounding electrode.

Answer

Install two ground rods and ignore the other available electrodes.

Question 5

What is the primary function of the main bonding jumper at the service equipment?

Accepted Answer

To connect the neutral conductor and the equipment grounding conductor to the service disconnect enclosure.

Answer

To connect the grounding electrode conductor to the neutral bar.

Answer

To bond the meter enclosure to the service panel.

Answer

To provide a direct connection from the equipment grounding bus to the grounding electrode.

Question 6

When installing multiple circuits in the same raceway, what determines the minimum size of a single equipment grounding conductor (EGC) for all circuits?

Accepted Answer

The ampere rating of the largest overcurrent device in the raceway.

Answer

The ampere rating of the smallest overcurrent device in the raceway.

Answer

The average ampere rating of all overcurrent devices in the raceway.

Answer

The total connected load of all circuits in the raceway.