NHIE Electrical Systems 2

Question 1

A home inspector finds aluminum wiring connected to a standard copper-rated outlet. What is the primary concern?

Accepted Answer

Aluminum and copper expand at different rates, causing loose connections and fire risk

Answer

Dissimilar metal expansion rates cause connections to loosen over time, creating arcing and fire hazards.

Question 2

What is the minimum clearance required between the top of a residential service panel and the ceiling?

Accepted Answer

36 inches

Answer

NEC requires 36 inches of headroom clearance above electrical equipment requiring examination or maintenance.

Question 3

A home inspector observes double-tapped breakers in a panel. Which scenario is acceptable?

Accepted Answer

Only on breakers specifically listed and labeled for two conductors

Answer

Some breakers are UL-listed to accept two conductors; this is noted in the manufacturer's listing.

Question 4

What does a GFCI receptacle protect against that a standard circuit breaker does not?

Accepted Answer

Ground faults where current takes an unintended path through a person

Answer

GFCI devices trip when they detect as little as 4–6 mA of current imbalance, protecting against electrocution.

Question 5

During an inspection, a home inspector notes that the grounding electrode conductor is spliced. What should the inspector report?

Accepted Answer

The grounding electrode conductor must be continuous without splices

Answer

NEC requires the grounding electrode conductor to run without splices from the panel to the grounding electrode.

(NHIE) National Home Inspector Examination Practice Test