BOX FILL Q's
When conductors enter an enclosure opposite a removable cover, the distance from where the conductors enter to the removable cover must not be less than _____ times the largest raceway.
"none of these"
When determining the number of conductors for box fill calculations, which of the following statements is(are) true?
-A luminaire stud or hickey is considered as one conductor for each type, based on the largest conductor that enters the outlet box. -Internal factory cable clamps are considered as one conductor for one or more cable clamps, based on the largest conductor that enters the outlet box. -A single-gang device yoke is considered as two conductors, based on the largest conductor that terminates on the strap (device mounting fitting).
The number of conductors permitted in a raceway is dependent on the _____.
-area of the conductors as listed in Chapter 9, Tables 5 and 8 -percent of area fill as listed in Chapter 9, Table 1 -area of the raceway
What's the cross-sectional area in square inches for an 8 AWG bare solid conductor?
0.013 sq in.
What's the cross-sectional area in square inches for a 10 THW conductor?
0.0243 sq in.
A trade size 3 Schedule 40 PVC raceway contains seven 1 RHW conductors without outer cover. How many 2 THW conductors may be installed in this raceway with the existing conductors?
11 conductors
An existing trade size ¾ rigid metal conduit that doesn't exceed 24 in. in length contains four 10 THHN conductors and one 10 AWG (bare stranded) ground wire. How many additional 10 THHN conductors can be installed?
11 conductors
What's the maximum number of 400 kcmil THHN conductors that can be installed in a 6 in. x 6 in. wireway?
12 conductors
A junction box contains two trade size 2 raceways on the left side, and two trade size 2 raceways on the top. What's the minimum distance between the trade size 2 raceways that contain the same conductors if the junction box contains two trade size 2 raceways on the left side, and two trade size 2 raceways on the top?
12 in.
A junction box contains two trade size 2½ raceways on the left side and one trade size 2½ raceway on the right side. The conductors from one trade size 2½ raceway (on the left wall) are pulled through the raceway on the right wall. The other trade size 2½ raceway conductors (on the left wall) are pulled through a trade size 2½ raceway at the bottom of the pull box. What's the minimum distance between the raceways of the angle pull?
15 in.
What's the cross-sectional area of a 4 in. × 4 in. wireway?
16 sq in.
How many 14 AWG conductors can be pulled through a 4 in. × 1½ in. square box with a plaster ring marked 3.60 cu in.? The box already contains two duplex receptacles, five 14 AWG conductors, and two grounding conductors.
2 conductors
Determine the minimum number of cubic inches required for two 10 AWG conductors passing through a box, four 14 AWG conductors spliced in the box, two 12 AWG conductors terminating to a receptacle, and one 12 AWG equipment bonding jumper from the receptacle to the box.
20 cu in.
How many 18 TF conductors can be installed in trade size ¾ electrical metallic tubing?
24 conductors
What's the maximum allowable sq in. of conductor fill for a 4 in. × 4 in. wireway?
3.20 sq in.
The actual area of conductor fill is dependent on the raceway size and the number of conductors installed. If there are three or more conductors installed in a raceway, the total area of conductor fill is limited to _____ percent.
40
If a trade size 3 raceway entry (250 kcmil) is in the wall opposite a removable cover, the distance from that wall to the cover must not be less than _____.
4½ in.
What's the minimum size wireway required for six 500 kcmil THHN conductors?
6 in.
What size wireway is required for three 400 kcmil THHN, one 250 kcmil THHN, four 4/0 THHN conductors, and three 8 THHN conductors?
6 in. x 6 in. wireway
When a raceway doesn't exceed 24 in. in length, the raceway is permitted to be filled to percent of its cross-sectional area.
60
When all the conductors are the same size (total cross-sectional area including insulation), the number of conductors permitted in a raceway can be determined by simply looking at the Tables in _____ of the NEC.
Annex C
According to Annex C, Table C. 1, three 3/0 THHN conductors can be installed in 1½ EMT. Will this installation have the possibility of jamming?
No
What trade size ENT is required for four fiber optic cables having a diameter of 0.30 inches?
Trade size 1
What trade size ENT is required for three fiber optic cables having a diameter of 0.20 inches?
Trade size 1/2
A 200A feeder installed in Schedule 80 PVC has three 3/0 THHN conductors, one 2 THHN conductor, and one 6 THHN conductor. What size raceway is required?
Trade size 2 raceway
What trade size ENT raceway is required for four Cat 6 cables having a diameter of 0.22 inches?
Trade size 3/4
What's the minimum trade size EMT required for Type NM cable having a major diameter (ellipse) of 0.50 in.?
Trade size 3/4
Can a round 4 in. × ½ in. box marked as 8 cu in. with cable clamps supplied with 14/2 W/G NM cable be used with a luminaire that has two 18 TFN conductors and a canopy cover?
Yes.
What's the cross-sectional area in square inches for a 14 RHW conductor (without an outer cover)?
0.0209 sq in.
The minimum distance between the two trade size 2 raceways that contain the same Conductor C as illustrated in Figure 5-91 is _____.
12 in.
What's the minimum distance from the left wall to the right wall if the junction box contains two trade size 2 raceways on the left side, and two trade size 2 raceways on the top?
14 in.
A junction box contains two trade size 2½ raceways on the left side and one trade size 2½ raceway on the right side. The conductors from one trade size 2½ raceway (on the left wall) are pulled through the raceway on the right wall. The other trade size 2½ raceway conductors (on the left wall) are pulled through a trade size 2½ raceway at the bottom of the pull box. What's the minimum distance from the left wall to the right wall?
20 in.
How many 16 TFFN conductors can be installed in trade size ¾ electrical metallic tubing?
29 conductors
What size box is the minimum required for six 14 THHN conductors and three 14 THW conductors?
4 in. x 1 1/4 in. square box
What size outlet box is required for one 12/2 W/G NM cable that terminates on a switch and one 12/3 W/G NM cable that terminates on a receptacle? The box has cable clamps.
4 in. × 2 1⁄s in. square box
When determining the number of conductors in a box that has one 14/3 W/G NM cable, one switch, and two internal cable clamps, the count will equal _____.
7 conductors
How many 10 AWG conductors are permitted in a 4 in. square × 1½ in. deep box?
8 conductors
How many 6 RHH conductors (without outer cover) can be installed in trade size 1¼ electrical nonmetallic tubing?
8 conductors
It's permitted to omit one equipment grounding conductor and not more than _____ 18 AWG or 16 AWG fixture wire(s) that enter a box from a luminaire canopy.
four
