FREE AND STUDY GAMES ABOUT CODE AND PRACT CH 8

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FREE AND STUDY GAMES ABOUT CODE AND PRACT CH 8

EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -31 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: 1. Which NEC article provides the specific requirements for cellular concrete floor raceways. (Article 374,372,314, all of the above)

Answer:

Article 372 Question 2: 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)

Answer:

13.5 amperes, 374.17, 310.15 (B)(3) Question 3: 24.Loop wiring installed in cellular metal floor race-ways which are continuous through outlets are considered as splices or taps. T/F

Answer:

False, 374.6

Question 4: ( 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

Answer:

all of the above, 314.27(B) Question 5: 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%)

Answer:

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

Question 6: (cell, floor box, header, none of the above)

Answer:

Header Question 7: 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

Answer:

all of the above Question 8: 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

Answer:

True, 390.8

Question 9: 29. Dead ends of underfloor raceways shall be closed T/F

Answer:

True 390.11 Question 10: (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)

Answer:

All of the above, 390.9, 110.12

Question 11: (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)

Answer:

All of the above Question 12: ( 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

Answer:

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

314.27

Question 13: (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

Answer:

They are required to be removed, 374.7

Question 14: (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

Answer:

all of the above, 374.10 Question 15: 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)

Answer:

tools, 374.10 Question 16: 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)

Answer:

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

Question 17: 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%)

Answer:

40%, 390.6

Question 18: 27. Inserts used with metal underfloor raceways are required to be metallic types T/F

Answer:

True, 390.14 Question 19: 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)

Answer:

cell, 372.2 Question 20: 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

Answer:

a conductor no larger than that for which the raceway was designed, 390.5 Question 21: 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)

Answer:

Suitable bushings or fittings having smooth rounded edges, 374.100 Question 22: (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

Answer:

They are generally required to be listed, 314.27(b) Question 23: 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

Answer:

Where the authority having jurisdiction grants special permission, 372.10