Question 1

1. Which NEC article provides the specific requirements for cellular concrete floor raceways. (Article 374,372,314, all of the above)

Accepted Answer

Article 372

Question 2

(cell, floor box, header, none of the above)

Accepted Answer

Header

Question 3

(They are generally required to be listed, They are required to be nonmetallic, They must be approved, They shall be constructed of brass materials only

Accepted Answer

They are generally required to be listed, 314.27(b)

Question 4

4. Conductors or cables shall NOT fill underfloor raceways to more than __ of the cross-sectional area of the cell or header.(125%,80%,50%,40%)

Accepted Answer

40%,  390.6

Question 5

( Any box installed in a wood floor can be used for receptacles located in the floor, Only boxes listed specifically for this application shall be used for receptacles located in the floor, Only boxes listed specificaly for this applicati   TOO LONG

Accepted Answer

Only boxes listed specifically for this application shall be used for receptacles located in the floor, 314.27

Question 6

6. The maximum size conductor permitted to be installed in a cellular concrete floor raceway other than that allowed by special permission is__(10AWG,12AWG,8AWG,1/0AWG

Accepted Answer

1/0 AWG, 372.10

Question 7

7. Where 25 current-carrying conductors are installed in a cellular metal floor raceway, what adjustment factor percentage is required to be applied to the normal conductor ampacity given in NEC Table 310.15(B)(16)(45%,50%,70%,80%)

Accepted Answer

45%,  374.17;310.15(B)(3)

Question 8

(They are required to be removed, They are required to be capped with a wirenut connector, They are permitted to be taped and insulated and folded back into the raceway, all of the above

Accepted Answer

They are required to be removed, 374.7

Question 9

9. Where 8 current-carrying conductors are installed ina cellular concrete floor raceway, what adjustment factor percentage is required to be applied to the normal conductor ampaity given in NEC table 310.15(B)(16) (80%,70%,50%,45%)

Accepted Answer

70%,  372.17,  310.15(B)(3) ?

Question 10

10. __ is defined as a single, enclosed tubular space ina floor made of precast cellular concrete slas, the direction of the cell being parallel to the direction of the floor member ( cell,Header,raceway, non of the above)

Accepted Answer

cell,  372.2

Question 11

(where subject to corrosive vapor; in any hazardous location except as permitted by other articles in NEC; in commercial garages, other than for supplying ceiing outlets or extensions to the area below the floor, but not above; any of the above locations)

Accepted Answer

any of the above,  374.3

Question 12

12. Where cellular metal floor raceways are installed, a suitable number of markers shall be installed for locating__ for future use.(raceway, conductors, cells, headers)

Accepted Answer

cells,  374.8

Question 13

(they shall be leveled to the floor grade;
they shall be sealed against the entrance of concrete; they shall be of metal and shall be electrically continuous with the raceway; all of the above

Accepted Answer

all of the above,  374.10

Question 14

14. Where cutting through the metal cell wall to install inserts, __ designed to prevent the tool from entering the cell and damaging the conductors shall be used ( pliers, bushings, nipples, tools)

Accepted Answer

tools,  374.10

Question 15

15. Splices and taps in conductors used in cellular floor raceways shall be made only in__(listed enclosures, header access units or junction boxes, within the cell cavity, a conduit fitting connected to the cell

Accepted Answer

header access units or junction boxes, 374.6

Question 16

16.A cellular metal floor raceway contains 30 size 12 AWG THHN copper conductor, What is the maximum allowable ampacity for each of these conductors installed in this raceway(30 amperes, 20, 15, 13.5)

Accepted Answer

13.5 amperes,  374.17,  310.15 (B)(3)

Question 17

( it is not likely to be exposed to physical damage, it is not subject to moisture and dirt, the receptacles and covers used for this type o installation are listed as an assembly for this type of location, all of the above

Accepted Answer

all of the above, 314.27(B)

Question 18

18. Floor boxes installed in concrete must __(be constructed of cast metal material, be secured so they do not float in the concrete, have threaded hubs, be installed in above grade slabs)

Accepted Answer

be secured so they do not float in the concrete

Question 19

19. Nonmetallic floor boxes installed in concrete__(are for use in ground slabs only, shall have threaded hubs to keep moisture out, shall be durably and legibly marked by the manufacturer with their volume, non of the above are acceptable)

Accepted Answer

shall be durably and legibly marked by the manufacturer with their volume ,  314.16(a)(2)

Question 20

20. Floor boxes made of __ materials are listed to be installed in ground slabs.(nonmetallic, cast iron, fusion-bonded epoxy coated steel, all of the above

Accepted Answer

all of the above

Question 21

21. There are no listed floor boxes which have both power and plumbing services in the box. T/F

Accepted Answer

False

Question 22

Where the header duct is large enough; Where the cellular concrete floor raceway cross-sectionalfill area is  not filled to a capacity that exceeds 40% of its area;Where the authority having jurisdiction grants special permission

Accepted Answer

Where the authority having jurisdiction grants special permission,  372.10

Question 23

23. Where conductors pass across surfaces of cellular metal floor raceways, which of the following shall be provided(suitable bushings or fittings having smooth rounded edges, knockout seals, a listed conduit nipple, none of the above)

Accepted Answer

Suitable bushings or fittings having smooth rounded edges,  374.100

Question 24

24.Loop wiring installed in cellular metal floor race-ways which are continuous through outlets are considered as splices or taps. T/F

Accepted Answer

False,  374.6

Question 25

25. The largest size conductor permitted to be installed in an underfloor raceway is __(a conductor no larger than that for which the raceway was designed,1/0AWG,2/0AWG,10AWG

Accepted Answer

a conductor no larger than that for which the raceway was designed, 390.5

Question 26

(They shall be sealed to prevent the free entrance of water or concrete; They shall be metal and shall be electrically continous with the raceways; All of the above)

Accepted Answer

All of the above

Question 27

27. Inserts used with metal underfloor raceways are required to be metallic types T/F

Accepted Answer

True, 390.14

Question 28

(They shall be firmly held in place to prevent disturbing the alignment during constrution, They shall be installed in a neat and workmanlike manner, All of the above)

Accepted Answer

All of the above, 390.9, 110.12

Question 29

29. Dead ends of underfloor raceways shall be closed T/F

Accepted Answer

True 390.11

Question 30

30. When an outlet used with an underfloor raceway system is abandoned, discontinued, or removed, the sections of circuit conductors supplying the outlet shall be removed from the raceway. T/F

Accepted Answer

True, 390.8

Question 31

31. Where more than one and not more than three single underfloor raceways are each installed flush with the concrete, they shall be contiguous with each other and joined to form a rigid assemly T/F

Accepted Answer

no answer 390.4(D)

Question

Question

Question

Code and Pract ch 8

Infloor Installations

Question	Answer
1. Which NEC article provides the specific requirements for cellular concrete floor raceways. (Article 374,372,314, all of the above)	Article 372
2.__ is defined in Article 374 as transverse raceway for electric conductors, providing access to predetermined cells of a cellular metal floor, therby permitting the installation of electirc conductors froma a distribution center to the cells ( see next
(cell, floor box, header, none of the above)	Header
3.Floor boxes installed in grade level slabs for standard 125-volt, single-phase, 15 or 20-ampere receptacles are required to comply with which of the following. ( next card)
(They are generally required to be listed, They are required to be nonmetallic, They must be approved, They shall be constructed of brass materials only	They are generally required to be listed, 314.27(b)
4. Conductors or cables shall NOT fill underfloor raceways to more than __ of the cross-sectional area of the cell or header.(125%,80%,50%,40%)	40%, 390.6
5. Which of the following statements are true for floor boxes according to the Code? ( next card)
( Any box installed in a wood floor can be used for receptacles located in the floor, Only boxes listed specifically for this application shall be used for receptacles located in the floor, Only boxes listed specificaly for this applicati TOO LONG	Only boxes listed specifically for this application shall be used for receptacles located in the floor, 314.27
6. The maximum size conductor permitted to be installed in a cellular concrete floor raceway other than that allowed by special permission is__(10AWG,12AWG,8AWG,1/0AWG	1/0 AWG, 372.10
7. Where 25 current-carrying conductors are installed in a cellular metal floor raceway, what adjustment factor percentage is required to be applied to the normal conductor ampacity given in NEC Table 310.15(B)(16)(45%,50%,70%,80%)	45%, 374.17;310.15(B)(3)
8. When an outlet is abandoned, discontinued, or removed from a cellular metal floor raceway system, the sections of circuit conductors supplying the outlet shall meet which of the following requirements
(They are required to be removed, They are required to be capped with a wirenut connector, They are permitted to be taped and insulated and folded back into the raceway, all of the above	They are required to be removed, 374.7
9. Where 8 current-carrying conductors are installed ina cellular concrete floor raceway, what adjustment factor percentage is required to be applied to the normal conductor ampaity given in NEC table 310.15(B)(16) (80%,70%,50%,45%)	70%, 372.17, 310.15(B)(3) ?
10. __ is defined as a single, enclosed tubular space ina floor made of precast cellular concrete slas, the direction of the cell being parallel to the direction of the floor member ( cell,Header,raceway, non of the above)	cell, 372.2
11. Conductors shall NOT be installed in cellular metal floor raceways under which of the following locations or conditions ( next card)
(where subject to corrosive vapor; in any hazardous location except as permitted by other articles in NEC; in commercial garages, other than for supplying ceiing outlets or extensions to the area below the floor, but not above; any of the above locations)	any of the above, 374.3
12. Where cellular metal floor raceways are installed, a suitable number of markers shall be installed for locating__ for future use.(raceway, conductors, cells, headers)	cells, 374.8
13.Inserts used with cellular metal floor raceways are required to meet which of the following ( next card)
(they shall be leveled to the floor grade; they shall be sealed against the entrance of concrete; they shall be of metal and shall be electrically continuous with the raceway; all of the above	all of the above, 374.10
14. Where cutting through the metal cell wall to install inserts, __ designed to prevent the tool from entering the cell and damaging the conductors shall be used ( pliers, bushings, nipples, tools)	tools, 374.10
15. Splices and taps in conductors used in cellular floor raceways shall be made only in__(listed enclosures, header access units or junction boxes, within the cell cavity, a conduit fitting connected to the cell	header access units or junction boxes, 374.6
16.A cellular metal floor raceway contains 30 size 12 AWG THHN copper conductor, What is the maximum allowable ampacity for each of these conductors installed in this raceway(30 amperes, 20, 15, 13.5)	13.5 amperes, 374.17, 310.15 (B)(3)
17. Where a box is installed in the floor of a show window, it is NOT required to be listed as long as it meets which of the following requirements (next car)
( it is not likely to be exposed to physical damage, it is not subject to moisture and dirt, the receptacles and covers used for this type o installation are listed as an assembly for this type of location, all of the above	all of the above, 314.27(B)
18. Floor boxes installed in concrete must __(be constructed of cast metal material, be secured so they do not float in the concrete, have threaded hubs, be installed in above grade slabs)	be secured so they do not float in the concrete
19. Nonmetallic floor boxes installed in concrete__(are for use in ground slabs only, shall have threaded hubs to keep moisture out, shall be durably and legibly marked by the manufacturer with their volume, non of the above are acceptable)	shall be durably and legibly marked by the manufacturer with their volume , 314.16(a)(2)
20. Floor boxes made of __ materials are listed to be installed in ground slabs.(nonmetallic, cast iron, fusion-bonded epoxy coated steel, all of the above	all of the above
21. There are no listed floor boxes which have both power and plumbing services in the box. T/F	False
22. Three 3/0 copper Type XHHW conductors are permitted to be installed in cellular concrete floor raceways under which of the following conditions. ( where the raceway is large enough to fit all three conductors;( next card)
Where the header duct is large enough; Where the cellular concrete floor raceway cross-sectionalfill area is not filled to a capacity that exceeds 40% of its area;Where the authority having jurisdiction grants special permission	Where the authority having jurisdiction grants special permission, 372.10
23. Where conductors pass across surfaces of cellular metal floor raceways, which of the following shall be provided(suitable bushings or fittings having smooth rounded edges, knockout seals, a listed conduit nipple, none of the above)	Suitable bushings or fittings having smooth rounded edges, 374.100
24.Loop wiring installed in cellular metal floor race-ways which are continuous through outlets are considered as splices or taps. T/F	False, 374.6
25. The largest size conductor permitted to be installed in an underfloor raceway is __(a conductor no larger than that for which the raceway was designed,1/0AWG,2/0AWG,10AWG	a conductor no larger than that for which the raceway was designed, 390.5
26. Junction boxes used with underfloor racewy installation shall meet which of the following requirements( They shall be leveled to the floor grade, see next card
(They shall be sealed to prevent the free entrance of water or concrete; They shall be metal and shall be electrically continous with the raceways; All of the above)	All of the above
27. Inserts used with metal underfloor raceways are required to be metallic types T/F	True, 390.14
28. When installing underfloor raceways, which of the following requirements apply( They shall be laid so that a straight line from the center of one junction box to the center of the next junchtion box coincides with the centerline of the raceway system;
(They shall be firmly held in place to prevent disturbing the alignment during constrution, They shall be installed in a neat and workmanlike manner, All of the above)	All of the above, 390.9, 110.12
29. Dead ends of underfloor raceways shall be closed T/F	True 390.11
30. When an outlet used with an underfloor raceway system is abandoned, discontinued, or removed, the sections of circuit conductors supplying the outlet shall be removed from the raceway. T/F	True, 390.8
31. Where more than one and not more than three single underfloor raceways are each installed flush with the concrete, they shall be contiguous with each other and joined to form a rigid assemly T/F	no answer 390.4(D)

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