Unit 5 - Raceway and box calculations
5. What's the cross-sectional area in square inches for an 8AWG bare solid conductor? (a) 0.013sq. in. (b) 0.027 sq. in. (c) 0.038 sq. in. (d) 0.045 sq. in.
a
9. What size rigid metal conduit is required for 4/0. THHN conductors, one 1/0 THHN conductors, and one 4 THHN conductor with Raceway is 24 in. or less in length? (a) A trade size 1 1/2 Ridgid metal conduit (b) A trade size 2 rigid metal conduit (c) A trade size 2 1/2 rigid metal conduit (d) a trade size 3 Ridgid metal conduit
a
12. The equipment grounding conductors are installed in a Raceway, the actual area of the conductor must be used when calculating Raceway fill. (a) True (b) False
a..
4. What's the cross-sectional area in square inches for a 12 RHH conductor ( with an outer cover) ? (a) 0.0117 sq. in. (b) 0.0252 sq. in. (c) 0.0327 sq. in. (d) 0.0353 sq. in.
d
15. What trade size ENT is required for 3 fiber cables having a diameter of 0. 20 inches. (a) Trade Size 1/2 (b) Trade Size 3/4 (c) Trade Size 1 (d) Trade Size 1 1/4
a..
18. How many 18 TF conductors can be installed and trade size 3/4 electrical metallic tubing? (a) 24 conductors (b) 29 conductors (c) 30 conductors (d) 40 conductors
a..
20. How many six RHH conductors (without order cover) can be installed in trade size 1 1/4 electrical nonmetallic tubing? (a) 8 conductors (b) 13 conductors (c) 16 conductors (d) 25 conductors
a..
32. What size box is the minimum required for six 14 THHN conductors and three 14 THW conductors? (a) A 4 in. × 1 1/4 in. square box. (b) A 4 in. × 1 1/2 in. round box. (c) A 4 in. × 1 1/4 in. round box. (d) A 4 in. × 2 1/8 in. square box.
a..
33. How many 10 AWG conductors are permitted in a 4in x 1 1/2 in. Square box? (a) 8 conductors (b) 9 conductors (c) 10 conductors (d) 11 conductors
a..
38. Can a round 4 in. × 1/2 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? (a) Yes (b) No
a..
44. A junction box contains to trade size 2 1/2 raceways on the left side and one trade size 2 1/2 raceway on the right side. The conductor's from 1 trade size two and a half Raceway ( on the left wall) are pulled through the raceway on the right wall. The other trade size 2 1/2 Raceway conductors ( on the left wall) are pulled through a trade size 2 1/2 Raceway at the bottom of the pull box. What's the minimum distance from the bottom wall to the top wall? (a) 15 in (b) 18 in (c) 21 in (d) 24 in
a..
45.A junction box contains to trade size 2 1/2 raceways on the left side and one trade size 2 1/2 raceway on the right side. The conductor's from 1 trade size two and a half Raceway ( on the left wall) are pulled through the raceway on the right wall. The other trade size 2 1/2 Raceway conductors ( on the left wall) are pulled through a trade size 2 1/2 Raceway at the bottom of the pull box. What's the minimum distance between the raceways of the angle pull? (a) 15 in. (b) 18 in. (c) 21 in. (d) 24 in.
a..
46. A junction box contains 2 trade size 2 Raceway is on the left side, and to trade size to RaceWay on the top. What's the minimum distance from the left wall to the right wall? (a) 14 in (b) 21 in (c) 24 in (d) 28 in
a..
48. A junction box contains two trade size 2 raceways on the left side, and two trade 2 raceways on the top What's the minimum distance between the trade size 2 raceways that contain the same conductors? (a) 12 in. (b) 18 in (c) 21 in (d) 24 in
a..
What trade size rigid metal conduit is required for three 4/0 THHN conductors, one 1/0 THHN conductor, and one 4 THHN conductor when the raceway is 24 in. or less in length? (a) Trade Size 1 1/2 (b) Trade Size 2 (c) Trade Size 2 1/2 (d) Trade Size 3
a..
What's the minimum distance from the bottom wall to the top wall if the junction box contains two trade size 2 raceways on the left side, and two trade size 2 raceways on the top? (a) 14 in (b) 18 in (c) 21 in (d) 24 in
a..
8. A 200A feeder installed in schedule 80 PVC has 3/0 THHN conductors, one 2 THHN conductor, and one 6 THHN conductor. What size Raceway is required? (a) A trade size 2 Raceway (b) A trade size 2 1/2 Raceway (c) A tray size 3 Raceway (d) A trade size 3 1/2 Raceway
a.....
1. What's the cross-sectional area in square inches for a 10 THW conductor? (a) 0.0172 sq. in. (b) 0.0243 sq. in. (c) 0.0252 sq. in. (d) 0.0278 sq. in.
b
2. What's the cross-sectional area in square inches for a 14 RHW conductor (without an outer cover)? (a) 0.0172 sq. in. (b) 0.0209 sq. in. (c) 0.0252 sq. in. (d) 0.0278 sq. in.
b
21. How many 1/0 XHHW conductors can be installed in trade size 2 flexible metal conduit? (a) 6 conductors (b) 7 conductors (c) 13 conductors (d) 16 conductors
b
24. How many 6 THW-2 compact conductors can be installed in trade size 1 EMT? (a) 3 conductors (b) 5 conductors (c) 6 conductors (d) 9 conductors
b
6. The actual area of conduct the field 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 conduct the field is limited to_________ percent. (a) 31 (b) 40 (c) 53 (d) 60
b
14. What tree size ENT Raceway is required for 4 Cat6 cable having a diameter of 0.22 inches? (a) Trade Size 1/2 (b) Trade Size 3/4 (c) Trade Size 1 (d) Trade Size 1 1/4
b..
17. What's the minimum trade size EMT for Type NM cable having a major diameter (ellipse) of 0.50 in.? (a) Trade size 1/2 (b) Trade size 3/4 (c) Trade size 1 1/4 (d) Trade size 2
b..
19. How many 16 TFFN conductors can be installed in trade size 3/4 electrical metallic tubing? (a) 26 conductors (b) 29 conductors (c) 30 conductors (d) 40 conductors
b..
27. According to Annex C, Table C. 1, three 3/0 THHN conductors can be installed in 1 1/2 EMT. Will this installation have the possibility of jamming? (a) yes (b) no
b..
28. What's the cross-sectional area of a 4in × 4in wireway? (a) 6 sq in. (b) 16 sq in. (c) 36 sq in. (d) 66 sq in.
b..
29. What's the maximum allowable sq in. of conductor field for a 4in × 4in wire way? (a) 2.40 sq in. (b) 3.20 sq in. (c) 5.30 sq in. (d) 12 sq in.
b..
31. What's the minimum size wire way required for 6 500 kcmil THHN conductors? (a) 4 in. (b) 6 in. (c) 8 in. (d) 10 in.
b..
40. How many 14 AWG conductors can be pulled through a 4in × 1 1/2 in. Square box with the plaster ring marked 3.60 cu in.? The Box already contains two duplex receptacles, five 14 AWG conductors,and two grounding conductors. (a) 1 conductor (b) 2 conductors (c) 3 conductors (d) 4 conductores
b..
43. A junction box contains to trade size 2 1/2 raceways on the left side and one trade size 2 1/2 raceway on the right side. The conductor's from 1 trade size two and a half Raceway ( on the left wall) are pulled through the raceway on the right wall. The other trade size 2 1/2 Raceway conductors ( on the left wall) are pulled through a trade size 2 1/2 Raceway at the bottom of the pull box. What's the minimum distance from the left wall to the right wall? (a) 18 in (b) 20 in (c) 21 in (d) 24 in
b..
23. 3 THHN compact conductors are needed in a trade size 2 rigid metal conduit. What's the largest compact conductor that can be installed? (a) 4/0 (b) 250 kcmil (c) 350 kcmil (d) 500 kcmil
c
25. How many 4/0 RHH conductors with an outer cover can be installed in trade size 2 IMC? (a) 1 conductor (b) 2 conductors (c) 3 conductors (d) 4 conductors
c
26. What's the smallest trade size PVC Schedule 40 raceway that can be used for the installation of four 1/0 THHN conductors? (a) Trade size 3/4 (b) Trade size 1 (c) Trade size 1 1/2 (d) Trade size 2
c
3. What's the cross-sectional area in square inches for a 10 THHN conductor? (a) 0.0117 sq. in. (b) 0.0172 sq. in. (c) 0.0211 sq. in. (d) 0.0252 sq. in.
c
11. 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. (a) chapter 9 (b) Annex B (c) Annex C (d) Annex D
c..
16. What size ENT is required for 4 fiber cable having a diameter of 0.30 inches? (a) Trade Size 1/2 (b) Trade Size 3/4 (c) Trade Size 1 (d) Trade Size 1 1/4
c..
39. What size outlet box is required for one 12/2 W/G NM cable that terminates on a receptacle, and the box has cable clamps? (a) A 4 in. × 1 1/4 in. Square box (b) A 4 in. × 1 1/2 in. Square box (c) A 4 in. × 2 1/8 in. Square box (d) A 3 in. × 2 in. × 3 1/2 in. device box
c..
22. How many 12 RHH conductors ( without a cover) can be installed in a trade size 1 IMC Raceway? (a) 4 conductors (b) 5 conductors (c) 7 conductors (d) 11 conductors
d
7. The number of conductors permitted in a Raceway is dependent on the____________. (a) area of the Raceway (b) percent of area field as listed in chapter 9, table 1 (c) area of conductors as listed in chapter 9, Tables 5 and 8 (d) all of these
d
10. An existing trade size 3/4 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? (a) 5 conductors (b) 7 conductors (c) 9 conductors (d) 11 conductors
d..
13. When a Raceway doesn't exceed 24 inch. In length, the Raceway is permitted to be filled to _______ percent of it's cross-sectional area. (a) 31 (b) 40 (c) 53 (d) 60
d..
30. What's the maximum number of 400 kcmil THHN conductors that can be installed in a 6in x 6in wire way? (a) 4 conductors (b) 6 conductors (c) 10 conductors (d) 12 conductors
d..
34. Table 314. 16 (A) doesn't take into consideration the volume of________. (a) switches and receptacles (b) Luminaire studs and hickeys (c) internal cable clamps (d) all of these
d..
35. When determining the number of conductors for box fill calculations, which of the following statements is ( are) true? (a) a Luminaire stud or hickey is considered is 1 conductor for each type, based on the largest conductor that enters the outlet box. (b) 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. (c) a single gang device yoke is considered as two conductors, based on the largest conductor that terminates on the strap ( device mounting fitting) . (d) all of these
d..
36. When determining number of conductors for box fill calculations, which of the following statements is true? (a) each conductor that runs through the box without a splice or leaving a loop long enough to splice is considered as one conductor. (b) used conductor that originates outside the box and terminates in the box is considered as one conducter. (c) Wirenuts, cable connectors, Raceway fittings, are conductors that originate and terminate within the outlet box ( equipment bonding jumpers and pigtails) aren't counted for box fill calculations. (d) all of these
d..
37. It's permitted to Omit one equipment grounding conductor and not more than_________ 18 AWG or 16 AWG fixture wires that into a box from a Luminaire canopy. (a) one (b) two (c) three (d) four
d..
41. When conductors 4 AWG and larger are installed in boxes and conduit bodies, the enclosure must be sized According to which of the following requirements? (a) the minimum distance for straight pull calculations from where the conductors enter to the opposite wall must not be less than 8 times the trade size of the largest Raceway. (b) the distance for angle pull calculations from the Raceway entry to the opposite wall must not be less than six times the trade size diameter of the largest Raceway, plus the sum of the diameters of the remaining raceways on the same wall and row. (c) the distance between raceways enclosing the same conductors must not be less than six times the trade size diameter of the largest Raceway. (d) all of these
d..
42. When conductors enter an enclosure opposite a removable cover Karma the distance from where the conductors enter to the removable cover must not be less than__________ times the largest Raceway. (a) six (b) eight (c) a or b (d) none of these
d..