FREE E2 Wiring Methods and Materials Questions and Answers

Question 1

An inspector observes a 40-foot continuous run of 1-inch Electrical Metallic Tubing (EMT) installed exposed on a commercial warehouse wall.
What are the maximum permitted spacing requirements for securing and supporting this raceway according to NEC Article 358?

Accepted Answer

Within 3 feet of each box and every 10 feet thereafter.

Answer

Within 5 feet of each box and every 10 feet thereafter.

Answer

Within 3 feet of each box and every 12 feet thereafter.

Answer

Within 18 inches of each box and every 8 feet thereafter.

Question 2

According to NEC Table 310.15(C)(1), what is the required adjustment factor for the allowable ampacity of conductors when there are 8 current-carrying conductors installed in a single conduit?

Accepted Answer

70%

Answer

80%

Answer

50%

Answer

100%

Question 3

When Type MC cable is installed through a field-punched hole in a steel stud in a commercial building, which of the following protection methods is required by the NEC?

Accepted Answer

A listed bushing or grommet must be installed in the opening.

Answer

A steel plate must be installed on the face of the stud.

Answer

The hole must be located at least 1-1/4 inches from the edge of the stud.

Answer

The cable must be wrapped with electrical tape where it passes through the stud.

Question 4

In a commercial building, which of the following wiring methods is generally prohibited by NEC Article 358 for use where it would be subject to severe physical damage?

Accepted Answer

Electrical Metallic Tubing (EMT)

Answer

Rigid Metal Conduit (RMC)

Answer

Intermediate Metal Conduit (IMC)

Answer

Reinforced Thermosetting Resin Conduit (RTRC-XW)

Question 5

An inspector is performing a box fill calculation for a metal device box. According to NEC 314.16(B)(4), what volume allowance must be made for a single duplex receptacle mounted on a single yoke?

Accepted Answer

A double volume allowance based on the largest conductor connected to the device.

Answer

A single volume allowance based on the largest conductor connected to the device.

Answer

No volume allowance is required for the device itself.

Answer

A triple volume allowance based on the average size of conductors in the box.

Question 6

Which of the following wiring methods is permitted by the NEC to be installed in direct contact with the earth (direct burial) when made of galvanized steel?

Accepted Answer

Rigid Metal Conduit (RMC)

Answer

Flexible Metal Conduit (FMC)

Answer

Article 362 Tubing (ENT)

Answer

Armored Cable (Type AC)

An inspector observes a 40-foot continuous run of 1-inch Electrical Metallic Tubing (EMT) installed exposed on a commercial warehouse wall.What are the maximum permitted spacing requirements for securing and supporting this raceway according to NEC Article 358?

An inspector observes a 40-foot continuous run of 1-inch Electrical Metallic Tubing (EMT) installed exposed on a commercial warehouse wall.
What are the maximum permitted spacing requirements for securing and supporting this raceway according to NEC Article 358?