Electrician Wiring Methods and Materials

Question 1

What type of wiring method is commonly referred to as 'Romex'?

Accepted Answer

Nonmetallic-sheathed cable (NM)

Answer

Armored cable (AC)

Answer

Metal-clad cable (MC)

Answer

Underground feeder cable (UF)

Question 2

What is the maximum conduit fill percentage allowed for one conductor in a conduit per NEC Chapter 9?

Accepted Answer

53%

Answer

31%

Answer

40%

Answer

60%

Question 3

Which wiring method is required in Class I, Division 1 hazardous locations?

Accepted Answer

Rigid metal conduit (RMC) or equivalent

Answer

NM cable

Answer

PVC conduit

Answer

MC cable

Question 4

What color is the outer jacket of 12 AWG NM cable (Romex)?

Accepted Answer

Yellow

Answer

White

Answer

Orange

Answer

Gray

Question 5

What is the maximum support spacing for rigid metal conduit (RMC) per the NEC?

Accepted Answer

10 feet

Answer

5 feet

Answer

8 feet

Answer

12 feet

Question 6

Which type of conduit is approved for direct burial without concrete encasement?

Accepted Answer

Rigid PVC (Schedule 40)

Answer

EMT

Answer

IMC

Answer

Flexible metal conduit