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

Romex is the brand name commonly used for nonmetallic-sheathed cable (NM cable) per NEC Article 334.

Question 2

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

Accepted Answer

53%

Answer

NEC Chapter 9, Table 1 allows 53% conduit fill when only one conductor is installed.

Question 3

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

Accepted Answer

Rigid metal conduit (RMC) or equivalent

Answer

Class I, Division 1 hazardous locations require rigid metal conduit or other approved methods to contain potential ignition sources.

Question 4

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

Accepted Answer

Yellow

Answer

12 AWG NM cable has a yellow outer jacket, while 14 AWG is white and 10 AWG is orange.

Question 5

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

Accepted Answer

10 feet

Answer

The NEC requires RMC to be supported at least every 10 feet and within a certain distance of boxes and fittings.

Electrician Practice Test