E2 Commercial Electrical Inspector Systems and Equipment

Question 1

Which of the following wiring methods is permitted for use in a commercial building?

Accepted Answer

Rigid metal conduit (RMC)

Answer

Nonmetallic-sheathed cable (NM)

Answer

Armored cable (AC)

Answer

Flat conductor cable (FCC)

Question 2

What is the primary purpose of grounding in a commercial electrical system?

Accepted Answer

To reduce the risk of electric shock and equipment damage

Answer

To ensure proper voltage levels

Answer

To provide a path for lightning strikes

Answer

To prevent overloading of circuits

Question 3

A feeder supplying a 3-phase, 208-volt system has a calculated load of 120 amperes. What size copper conductor with THHN insulation is required, assuming no derating factors apply?

Accepted Answer

#4 AWG

Answer

#6 AWG

Answer

#3 AWG

Answer

#2 AWG

Question 4

What type of overcurrent protection device is typically used to protect a motor circuit?

Accepted Answer

Time-delay fuse

Answer

Circuit breaker

Answer

Non-time-delay fuse

Answer

Ground-fault circuit interrupter (GFCI)

Question 5

How many receptacles are required in a commercial office space measuring 400 square feet, according to general NEC guidelines?

Accepted Answer

8

Answer

4

Answer

6

Answer

10