Infloor Installations
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| show | Article 372
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| 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 | show 🗑
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| show | Header
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| show |
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| show | They are generally required to be listed, 314.27(b)
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| 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%) | show 🗑
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| 5. Which of the following statements are true for floor boxes according to the Code? ( next card) | show 🗑
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| ( 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 | show 🗑
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| 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 | show 🗑
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| 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%) | show 🗑
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| show |
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| (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 | show 🗑
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| show | 70%, 372.17, 310.15(B)(3) ?
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| 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) | show 🗑
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| 11. Conductors shall NOT be installed in cellular metal floor raceways under which of the following locations or conditions ( next card) | show 🗑
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| (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) | show 🗑
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| show | cells, 374.8
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| 13.Inserts used with cellular metal floor raceways are required to meet which of the following ( next card) | show 🗑
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| (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 | show 🗑
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| show | tools, 374.10
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| show | header access units or junction boxes, 374.6
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| show | 13.5 amperes, 374.17, 310.15 (B)(3)
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| show |
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| ( 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 | show 🗑
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| show | be secured so they do not float in the concrete
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| 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) | show 🗑
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| 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 | show 🗑
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| 21. There are no listed floor boxes which have both power and plumbing services in the box. T/F | show 🗑
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| show |
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| show | Where the authority having jurisdiction grants special permission, 372.10
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| 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) | show 🗑
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| show | False, 374.6
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| 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 | show 🗑
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| show |
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| (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) | show 🗑
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| 27. Inserts used with metal underfloor raceways are required to be metallic types T/F | show 🗑
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| 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; | show 🗑
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| (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) | show 🗑
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| 29. Dead ends of underfloor raceways shall be closed T/F | show 🗑
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| show | True, 390.8
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| 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 | show 🗑
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