EETC Wiring & Installation Techniques 2

Question 1

When installing EMT conduit, the maximum support spacing for conduit sized 3/4 inch and smaller is:

Accepted Answer

10 feet

Answer

NEC 358.30 requires EMT 3/4 inch and smaller to be supported within 3 feet of each box and at intervals not exceeding 10 feet.

Question 2

Which type of cable is specifically designed for direct burial without conduit?

Accepted Answer

UF-B

Answer

UF-B (Underground Feeder) cable is rated for direct burial applications without requiring conduit.

Question 3

When pulling wire through conduit, the maximum fill percentage for three or more conductors is:

Accepted Answer

31%

Answer

NEC Chapter 9 Table 1 limits conduit fill to 31% of interior cross-sectional area when three or more conductors are installed.

Question 4

A 20-amp, 120-volt bathroom receptacle circuit must be:

Accepted Answer

GFCI protected only

Answer

NEC 210.8 requires all bathroom receptacles to have GFCI protection due to proximity to water sources.

Question 5

The minimum burial depth for PVC conduit (Schedule 40) under a residential driveway is:

Accepted Answer

18 inches

Answer

NEC Table 300.5 requires PVC conduit under driveways to be buried at least 18 inches deep.

(EETC) Electrical Technician Certification Practice Test