FREE TN LLE Raceways and Boxes Questions and Answers

Question 1

An electrician is installing a run of 1/2-inch Electrical Metallic Tubing (EMT) on the surface of a wall.
According to NEC Article 358, what is the maximum permitted spacing between supports for this raceway?

Accepted Answer

10 feet

Answer

3 feet

Answer

5 feet

Answer

12 feet

Question 2

An electrician installs a junction box with raceways containing 4 AWG conductors entering and leaving on opposite walls for a straight pull. According to NEC 314.28(A)(1), what is the minimum required length of this pull box?

Accepted Answer

Eight times the trade size of the largest raceway.

Answer

Six times the trade size of the largest raceway.

Answer

Twelve times the trade size of the largest raceway.

Answer

Four times the trade size of the largest raceway.

Question 3

What is the maximum total degrees of bends permitted in a single run of conduit between two pull points (e.g., from one junction box to another)?

Accepted Answer

360 degrees

Answer

180 degrees

Answer

270 degrees

Answer

450 degrees

Question 4

An electrician is calculating the required size of a device box that will contain one duplex receptacle, two 12/2 non-metallic sheathed cables, and has no internal clamps. How many conductor volumes must be counted for the duplex receptacle itself?

Accepted Answer

Two, based on the largest conductor connected to it.

Answer

One, based on the largest conductor connected to it.

Answer

None, devices do not count toward box fill.

Answer

Four, one for each screw terminal.

Question 5

When installing more than two current-carrying conductors in a single raceway, what is the maximum allowable percentage of the raceway's interior cross-sectional area that can be filled?

Accepted Answer

40%

Answer

53%

Answer

31%

Answer

60%

Question 6

An electrician is installing a 4" x 4" x 1-1/2" square metal box. The box will contain four 12 AWG conductors and two 14 AWG conductors, all spliced within the box. There are no devices or internal clamps. Is this installation compliant with NEC box fill requirements?

Accepted Answer

No, the required volume exceeds the box's capacity.

Answer

Yes, the total volume used is less than the box's capacity.

Answer

Yes, because the box contains fewer than ten conductors.

Answer

No, conductors of different sizes cannot be mixed in this type of box.

An electrician is installing a run of 1/2-inch Electrical Metallic Tubing (EMT) on the surface of a wall.According to NEC Article 358, what is the maximum permitted spacing between supports for this raceway?

An electrician is installing a run of 1/2-inch Electrical Metallic Tubing (EMT) on the surface of a wall.
According to NEC Article 358, what is the maximum permitted spacing between supports for this raceway?