Term
True or False:
On a three phase, 4-wire wye circuit, where the major portion of the load consists of electrical-discharge lighting, data-processing equipment, or other harmonic inducting loads, the grounded conductor must be counted when applying 310.15(B)(2) adjustment factors. |
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Definition
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Term
True or False:
Round boxes must not be used where conduits or connectors requiring the use of locknuts or bushings are to be connected to the side of the box. |
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Definition
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Term
True or False:
When determining the number of conductors in a box, and one or more factory or field-supplied internal cable clamps are present in the box, a double volume allowance for the clamps, in accordance with table 314.16 (B) , must be made based on the largest conductor present in the box. |
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Definition
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Term
True or False:
Splices and taps can be made in conduit that are durably and legibly marked by the manufacturer with their volume and the maximum number of conductors as computed in accordance with table 314.16(B). |
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Definition
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Term
True or False:
Outlet boxes can be secured to independent support wires, which are taut and secured at both ends, if the box is supported to the independent support wires using methods identified for the purpose. |
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Definition
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Term
True or False:
Exposed runs of type AC cable must closely follow the surface of the building finish or of running boards. exposed runs are also permitted to be installed on the underside of joists where supported at each joist and located so as not to be subject to physical damage. |
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Definition
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Term
True or False:
When armored cable is run parallel to the sides of rafters, studs or floor joists in an accessible attic, the cable must be protected with running boards |
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Definition
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Term
| When bare grounding conductors are allowed, their ampacities are limited to_____. |
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Definition
those permitted for the insulated conductors of thye same size.
310.15 (b)(3) |
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Term
| Service and Feeder conductors may be sized using Table 310.15(B)(6) for___ |
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Definition
only 120/240 volt, single phase services for individual dwelling units
310.15(B)(6) |
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Term
| In designing circuits, the current carrying capacity of conductors should be corrected for heat at room temperatures above __. |
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Definition
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Term
| The ampacity of a single insulated 1/10 THHN copper conductors should be corrected for heat at room temperatures above ___. |
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Definition
260A
table 310.17 , table 310.69 |
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Term
| As used in the code, thermal resistivity refers to the heat __- capability through a substance by conduction. |
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Definition
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Term
| Table 310.70 provides the ampacities of insulated single aluminum conductors isolated in air. if the conductor size is 8 AWG, MV-90, and the voltage range is 2,001 through 5,000, then the ampacity is ___. |
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Definition
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Term
| Cabinets or cutout boxes installed in wet locations must be ___. |
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Definition
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Term
| Where raceways or cables enter above the level of unisulated live parts of an enclosure in a wet location, a(n) ___ must be used. |
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Definition
fitting listed for wet locations
312.2(A) |
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Term
| Plaster, drywall or plasterboard surfaces that are broken or incomplete must be repair so there will be no gaps or open spaces greater than ___ at the edge of a cabinet or cutout box employng a flush-type cover. |
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Definition
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Term
| Each cable entering a cutout box ___. |
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Definition
must be secured to the cutout box
312.5(C) |
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Term
| A switch enclosure (cabinet) must not be used as a junction box, except where adequate space is provided so that the conductors don't fill the wiring space at any cross section to more than 40% of the cross sectional area of the space, and so that ___ don't fill the wiring space at any cross section to more than 75% of the cross sectional area of the space. |
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Definition
1. taps
2. conductors
3. splices
312.8 |
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Term
| Metallic boxes are required to be ___ . |
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Definition
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Term
| Short radius conduit bodies such as capped elbows, and service entrance elbows that enclose conductor 6AWG and smaller are intended to enable the installation of the raceway and the contained conductors and must not contain ___. |
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Definition
splices, devices or taps
314.5 |
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Term
| According to the NEC, the volume of a 3 x 2 x 2 in device box is |
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Definition
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Term
| When counting the number of conductors in a box, a conductor running through the box with an unbroken loop not less than twice the minimum length required for free conductors in 300.14 is counted as ___ conductor(s). |
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Definition
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Term
| Each yoke or strap containing one or more devices or equipment counts as __ conductor(s), based on the largest conductor that terminates on that device. |
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Definition
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Term
| When a box contains three equipment grounding conductors that originated outside the box, the three grounding conductors are counted as ___ conductor(s) when determining the number of conductors in a box for box fill calculations. |
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Definition
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Term
| In noncombustible walls or ceilings, the front edge of a a box, plaster ring, extension ring, or listed extender may be set back not more than ___ from the finished surface. |
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Definition
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Term
| Plaster, drywall, or plasterboard surfaces that are broken or incomplete around boxes employing a flush type cover or faceplate must be repaired so there will be no gaps or open spaces larger than ___ at the edge of the box. |
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Definition
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Term
| Only a ___ wiring method can be used for a surface extension from a cover, and the wiring method must include an equipment grounding conductor. |
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Definition
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Term
| Nails or screws can fasten boxes to structural members of a building using brackets on the outside of the enclosure, or they can pass through the interior within ___ of the back or ends of the enclosure. Screws are not permitted to pass through the box unless exposed threads in the box are protected using approved means to avoid abrasions of conductor insulation. |
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Definition
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Term
| When mounting an enclosure in a finished surface, the enclosure must be __ secured to the surface by clamps, anchors, or fittings identified for the application. |
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Definition
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Term
| Enclosures not over 100 cu in. that have threaded entries that support luminaries or contain devices are considered adequately supported where two or more conduits are threaded wrench tight into the enclosure where each conduit is supported within ___ of the enclosure. |
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Definition
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Term
| The minimum size box that is to contain a flush device must not be less than __ deep. |
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Definition
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Term
| Outlet boxes used at luminaire or lampholder outlets must be ___. |
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Definition
designed for the purpose
314.27(A) |
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Term
| Luminaries must be supported independently of the outlet box where the weight exceeds ___. |
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Definition
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Term
| When installing floor boxes, boxes___ must be used. |
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Definition
listed specifically for this application
314.27(C) |
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Term
| Listed outlet boxes, or outlet box systems that are identified for the purpose are permitted to support ceiling suspended fans that weigh more than 35 lbs but no more than ___ if the allowable weight is marked on the box. |
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Definition
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Term
| Pull boxes or junction boxes that have any dimension over ___ must have all conductors cabled or racked in an approved manner. |
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Definition
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Term
| Listed boxes designed for underground installation can be directly buried when covered by ___ if their location is identified and accessible. |
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Definition
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Term
| Handhole enclosures must be sized in accordance with 314.28(A) for conductors operating at 600V and below. for handhole enclosures without bottoms, the measurement to the removable cover is taken from the ___. |
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Definition
end of the conduit or cable assembly
314.30(A) |
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Term
| Where handhole enclosures without bottoms are installed, all enclosed conductors and any splices or terminations, if present, must be listed as ___. |
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Definition
suitable for wet locations
314.30(C) |
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Term
| Handhole enclosure covers must require the use of tools to open, or they must weigh over ___. metal covers and other exposed conductive surfaces must be bonded to an effective ground fault current path. |
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Definition
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Term
| Metal boxes over ___ in size must be constructed so as to be of ample strength and rigidity, sheet steel must not be less than 0.053 in thick. |
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Definition
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Term
| For systems over 600V, the length of a pull box for a straight pull must not be less than ___ entering the box. |
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Definition
48 times the outside diameter of the largest shielded conductor or cable
314.71(A) |
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Term
| For angle or U-pulls, the distance between the shielded conductor entry ( for systems over 600V, nominal) and the opposite wall of the box must not be less than ___ times the outside diameter of the largest cable or conductor. |
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Definition
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Term
| The use of type AC cable is permitted in __ installations |
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Definition
cable tray and exposed
320.1 |
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Term
| Where run across the top of floor joints, or within 7 ft of floor or floor joists, across the face of rafters or studding in attics and roof spaces that are accessible by permanent stairs or ladders, type AC cable must be protected by substantial guard strips that are ___. |
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Definition
at least as high as the cable
320.23(A) |
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Term
| Type AC cable must be supported and secured at intervals not exceeding 4 1/2 ft and the cable must be secured within __ of every outlet box, cabinet, conduit body, or other armored cable termination. |
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Definition
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Term
| Unless specified elsewhere in the code, Chapter 3 must be used for voltages of _______. |
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Definition
600 volts nominal, or less
REF 300.2(A) |
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Term
| UF cable used with a 24volt landscape lighting system is permitted to have a minimum cover of ____. |
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Definition
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Term
| In general, areas where _____ are handled and stored may present severe corrosive conditions, particularly when wet or damp. |
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Definition
| acids and alkali chemicals |
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Term
| True or False: Conductors must be insulated except where specifically allowed by the NEC to be bare. |
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Definition
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Term
| In general the minimum size conductor that may be paralleled shall not be smaller than ________. |
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Definition
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Term
| The minimum size conductor permitted in any building for branch circuit wiring under 600volts is _____ AWG. |
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Definition
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