CMI Electrical Systems Inspection 3

Question 1

An Arc Fault Circuit Interrupter (AFCI) breaker is designed to protect against which specific hazard?

Accepted Answer

Arcing faults in wiring and cords that can ignite surrounding materials and cause fires

Answer

AFCI devices detect the unique electrical signature of arcing faults — such as those caused by damaged insulation or loose connections — and interrupt power before ignition occurs.

Question 2

In which locations does the NEC mandate Ground Fault Circuit Interrupter (GFCI) protection for receptacle outlets in residential construction?

Accepted Answer

In bathrooms, kitchens near the sink, garages, outdoors, crawl spaces, unfinished basements, and similar wet or damp locations

Answer

GFCI protection is required wherever water and electricity may come into contact, including bathrooms, kitchen countertop receptacles, garages, outdoor outlets, and unfinished basements.

Question 3

During an inspection, an open junction box with exposed wire splices is found in an attic. What is the primary safety hazard this presents?

Accepted Answer

Exposed splices can cause electric shock if contacted and arcing from loose connections can ignite nearby combustibles

Answer

The NEC requires junction boxes to have covers because exposed splices present shock hazards and arcing from deteriorating connections can ignite insulation or framing materials.

Question 4

A home inspector identifies light bulbs installed in fixtures that have a maximum wattage label of 60W, but the bulbs are 100W incandescent. What condition is this?

Accepted Answer

Overlamping: using a bulb exceeding the fixture's wattage rating, which generates excess heat and creates a fire hazard

Answer

Overlamping causes the fixture, socket, and surrounding materials to overheat beyond their design limits, which can melt insulation or ignite combustible materials near the fixture.

Question 5

A home inspector finds two-prong ungrounded receptacles throughout an older home. Which statement most accurately describes the implication?

Accepted Answer

A safety deficiency: without a ground path, certain faults cannot be safely cleared and equipment damage or shock risk increases

Answer

Ungrounded outlets lack an equipment grounding conductor, which means fault current from a failing appliance has no safe return path, increasing the risk of shock and equipment damage.

CMI - Certified Master Inspector Practice Test

CMI - Certified Master Inspector Practice Test

CMI Electrical Systems Inspection 3