InterNACHI Electrical Systems & Safety 3

Question 1

According to NEC, GFCI protection is required in which of the following locations?

Accepted Answer

Bathroom receptacles

Answer

NEC mandates GFCI protection for all bathroom receptacles due to the proximity of water sources.

Question 2

What is the purpose of a bonding jumper in an electrical system?

Accepted Answer

To connect grounded metal parts to ensure a low-impedance fault path

Answer

A bonding jumper connects all metallic components of the electrical system to ensure a reliable path for fault current to flow back to the source.

Question 3

What wire gauge is required for a 20-amp branch circuit using copper conductors?

Accepted Answer

12 AWG

Answer

A 20-amp circuit requires 12 AWG copper conductors, as 14 AWG is only rated for 15-amp circuits.

Question 4

A home inspector finds a 15-amp breaker protecting a circuit with 12 AWG wire. This is:

Accepted Answer

Acceptable — the wire exceeds the breaker's ampacity rating

Answer

Using 12 AWG wire on a 15-amp breaker is acceptable because the wire can handle more current than the breaker will allow.

Question 5

Which of the following describes a 'floating neutral' condition at a sub-panel?

Accepted Answer

The neutral wire is connected to the ground bus, creating a fault path

Answer

At a sub-panel, a floating neutral means the neutral bus is incorrectly bonded to the ground bus, which should only occur at the main panel.

(InterNACHI) International Association of Certified Home Inspectors Practice Test