(Article 300) - GENERAL REQUIREMENTS FOR WIRING METHODS AND MATERIALS
Raceways can be used as a means of support of Class 2 circuit conductors or cables that connect to the same equipment. (a) True (b) False
(A) TRUE
Electrical equipment with _______ and having low smoke and heat release properties, and associated wiring metal suitable for the ambient temperature can be installed within air-handling space (plenum) (a) a metal enclosure (b) a nonmetallic enclosure listed for use within an air-handling (plenum) space (c) any type of enclosure (d) a or b
(D) A OR B
Where exposed to sunlight, nonmetallic raceways, cable trays, boxes, cables with a nonmetallic outer jack, fittings, and support hardware shall be _______ (a) listed as sunlight resistant (b) identified as sunlight resistant (c) a and b (d) a or b
(D) A OR B
A vertical run of 4/0 AWG copper shall be supported at intervals not exceeding _______ (a) 40 ft (b) 80 ft (c) 100 ft (d) 120 ft
(B) 80 FT
A cable, raceway, or box installed under metal-corrugated sheet roof decking shall be supported so the top of the cable, raceway, or box is not less than ______in. from the lowest surface of the roof decking to the top of the cable, raceway, or box (a) ½ (b) 1 (c) 1½ (d) 2
(C) 1½
________ is a nonferrous, nonmagnetic metal that has no heating due to hysteresis heating (a) steel (b) iron (c) aluminum (d) all of these
(C) ALUMINUM
Rigid metal conduit that is directly buried outdoors shall have at least _____ in. of cover. (a) 6 (b) 12 (c) 18 (d) 24
(A) 6
Where cables and nonmetallic raceways are installed parallel in framing members, the nearest outside surface of the cable or raceway shall be _____ the nearest edge of the framing member where nails or screws are likely to penetrate. (a) not less than 1¼ in. from (b) immediately adjacent to (c) not less than one sixteenths in. from (d) 90°
(A) NOT LESS THAN 1¼ IN. FROM
Where independent support wires of a suspended ceiling assemblies, or boxes above a ceiling, they shall be secured at the ______ end (s) (a) one (b) both (c) a or b (d) none of these
(B) BOTH
Metal raceways shall not be _______ by welding to the raceway. (a) supported (b) terminated (c) connected (d) all of these
(D) ALL OF THESE
No wiring of any type shall be installed in ducts used to transport _______ (a) dust (b) flammable vapors (c) loose stock (d) all of these
(D) ALL OF THESE
Wiring methods and equipment installed behind suspended-ceiling panels shall be arranged and secured to allow access to the electrical equipment (a) True (b) False
(A) TRUE
An exposed wiring system for indoor wet locations where walls are frequently washed shall be mounted so that there is at least a ______ between the mounting surface and the electrical equipment. (a) ¼-in. airspace (b) separator by insulated bushings (c) separation by noncombustible tubing (d) none of these
(A) ¼-IN. AIRSPACE
What is the minimum cover requirement for type UF cable supplying power to a 120V, 15A GFCI- protected circuit outdoors under a driveway of a one-family dwelling? (a) 6 in. (b) 12 in. (c) 16 in. (d) 24 in.
(B) 12 IN.
The space above a hung ceiling used for environmental air-handling purposes is an example of ________ and the wiring limitations of ______ apply. (a) a specifically fabricated duct used for environmental air, 300.22B (b) other space used of environmental air (plenum), 300.22(C) (c) a supply duct used for environmental air 300.22(B) (d) none of these
(B) OTHER SPACE USED FOR ENVIRONMENTAL AIR 300.22(B)
Wiring methods and cabling systems, listed for use in other spaces used for environmental air (plenums), shall be permitted to be installed in ducts specifically fabricated for environmental air-handling purposes ______. (a) only if necessary to connect to equipment or devices associated with the direct action upon or sensing of the contained air (b) if the total length of such wiring methods or cabling systems do not exceed 4 ft. (c) a or b (d) none of these
(C) A OR B
Where type NM cable passes through factory or field openings in metal members, it shall be protected by ______ bushing or ______ grommets that cover metal edges. (a) approved (b) identified (c) listed (d) none of these
(C) LISTED
Metal raceways, cable armor, and other metal enclosures shall be _______ joined together into a continuous electric conductor so as to provide effective electrical continuity. (a) electrically (b) permanently (c) metallically (d) none of these
(C) METALLICALLY
What is the minimum cover requirement for direct burial Type UF cable installed outdoors that supplies a 120V, 30A circuit? (a) 6 in. (b) 12 in. (c) 18 in. (d) 24 in.
(D) 24 IN.
Conduits or raceways through which moisture may contact live parts shall be _______ at either or both ends. (a) sealed (b) plugged (c) bushed (d) a or b
(D) A OR B
Conductors in raceways shall be _______ between outlets, boxes, devices, and so forth. (a) continuous (b) installed (c) copper (d) in conduit
(A) CONTINUOUS
Type UF cable used with a 24V landscape lighting system can have a minimum cover of _______ in. (a) 6 (b) 12 (c) 18 (d) 24
(A) 6
Type MC Cable listed for _______ is permitted to be installed underground under a building without installation of a raceway. (a) direct burial (b) damp and wet locations (c) rough service (d) b and c
(A) DIRECT BURIAL
A box or conduit body shall not be required for conductors in hand-hole enclosures, except where connected to electrical equipment. (a) True (b) False
(A) TRUE
Where corrosion protection is necessary for ferrous metal equipment and the conduit is threaded in the field, the threads shall be coated with a (n) __________ electrically conductive, corrosion resistant compound. (a) marked (b) listed (c) labeled (d) approved
(D) APPROVED
A _______, with an integral bushed opening shall be used at the end of a conduit or other raceway that terminates underground where the conductors or cables emerge as a direct burial wiring method. (a) splice kit (b) terminal fitting (c) bushing (d) b or c
(D) B OR C
Raceways and cables installed into the _______ of open bottom equipment shall not be required to be mechanically secured to the equipment (a) bottom (b) sides (c) top (d) any of these
(A) BOTTOM
In multiwire branch circuits, the continuity of the ________ conductor shall not be dependent upon the device connections. (a) ungrounded (b) grounded (c) grounding electrode (d) a and b
(B) GROUNDED
A (n)_________ is not a plenum space. (a) office space (b) mechanical room (c) space over a hung ceiling used for environmental air-handling purposes (d) a and b
(D) A AND B
Backfilled used for underground wiring shall not damage ______ or prevent adequate compaction of fill or contribute to corrosion. (a) raceways (b) cables (c) conductors (d) all of these
(D) ALL OF THESE
A bushing shall be permitted in lieu of a box or terminal where the conductors emerge from a raceway and enter or terminate at equipment such as open switchboards, unenclosed control equipment, or similar equipment. (a) True (b) False
(A) TRUE
The interior of underground raceways shall be considered a _______ location. (a) wet (b) dry (c) damp (d) corrosive
(A) WET
Which of the following metal parts shall be protected from corrosion? (a) Ferrous metal raceways. (b) Ferrous metal elbows (c) Ferrous boxes (d) all of these
(D) ALL OF THESE
The independent support wires for supporting electrical wiring methods in a fire-rated ceiling assembly shall be distinguishable from fire-rated suspended-ceiling framing support wires by _______ (a) color (b) tagging (c) other effective means (d) any of these
(D) ANY OF THESE
Equipment and devices shall only be permitted within ducts or plenum chambers specifically fabricated to transport environmental air if necessary for their direct action upon, or sensing of, the _________ (a) contained air (b) air quality (c) air temperature (d) none of these
(A) CONTAINED AIR
Raceways shall be _______ between outlet, junction, or splicing points prior to the installation of conductors. (a) installed complete (b) tested for ground faults (c) a minimum of 80 percent complete (d) none of these
(A) INSTALLED COMPLETE
_________ shall be permitted to support the wiring methods and equipment permitted to be used in other spaces used for environmental air (plenum) (a) metal cable tray systems (b) nonmetallic wireways (c) PVC conduit (d) surface nonmetallic raceways
(A) METAL CABLE TRAY SYSTEMS
Where cables or nonmetallic raceways are installed through bored holes in joists, rafters, or wood members, holes shall be bored so that the edge of the hole is ________ the nearest age of the wood member. (a) not less than 1¼ in. from (b) immediately adjacent to (c) not less than 1 sixteenth in. from (d) 90° away from
(A) NOT LESS THAN 1¼ IN. FROM
Cables laid in wood notches require protection against nails or screws by using a steel plate at least _______ in. thick, installed before the building finish is applied. (a) one sixteenth (b) ⅛ (c) ¼ (d) ½
(A) ONE SIXTEENTHS
Where nails or screws are likely to penetrate nonmetallic sheathed cable or ENT installed through metal framing members, a steel sleeve, steel plate, or steel clip not less than ________ in. in thickness shall be used to protect the cable or tubing. (a) one sixteenths (b) ⅛ (c) ½ (d) ¾
(A) ONE SIXTEENTHS
Electrical installations in hollow space, vertical shafts, and ventilation or air-handling ducts shall be made so that the possible spread of fire or products of combustion is not _____ (a) substantially increased (b) allowed (c) inherent (d) possible
(A) SUBSTANTIALLY INCREASED
Wiring methods installed behind panels that allow access shall be _____ according to their applicable articles. (a) supported (b) painted (c) in a metal raceway (d) all of these
(A) SUPPORTED
A box or conduit body shall not be required for splices and taps in direct-burial conductors and cables as long as the splices is made with a splicing device that is identified for the purpose. (a) True (b) False
(A) TRUE
A box or conduit body shall not be required when cables enter or exit from conduit or tubing that is used to provide cable support or protection against physical damage (a) True (b) False
(A) TRUE
Direct-buried conductors or cables can be spliced or tapped without the use of splice boxes when the splice or tap is made in accordance with 110.14 (B) (a) True (b) False
(A) TRUE
Raceways, cable assemblies, boxes, cabinets, and fittings shall be securely fastened in place. (a) True (b) False
(A) TRUE
"S" loops in equipment direct burial ______ to raceway transitions, expansion fittings in raceway risers to fixed equipment, and generally, the provision of flexible connections to equipment subject to settle meant or frost heaves are recognized by the NEC. (a) feeders and circuits (b) cables and conductors (c) sideways and cable trays (d) none of these
(B) CABLES AND CONDUCTORS
"_______" is defined as the area between the top of direct-burial cable and the top surface of the finished grade. (a) Notch (b) Cover (c) Gap (d) None of these
(B) COVER
Raceways or cable trays containing electric conductors shall not contain any pipe of tube for steam, water, air, gas, drainage, or any service other than ________. (a) as permitted by the authority having jurisdiction (b) electrical (c) pneumatic (d) as designed by the engineer
(B) ELECTRICAL
Spare or unused raceways shall be sealed with sealants ______ for use with the cable insulation, conductor, insulation, bare conductor, shield, or other components. (a) listed (b) identified (c) approved (d) any of these
(B) IDENTIFIED
Short sections of raceways used for ______ shall not be required to be installed complete between outlet, junction, or splicing points. (a) meter to service enclosure connection (b) protection of cables from physical damage (c) nipples (d) separately derived systems
(B) PROTECTION OF CABLES FROM PHYSICAL DAMAGE
All conductors of the same circuit, including the grounded (neutral) and equipment grounding conductors and bonding conductors shall be contained within the same ________, unless otherwise permitted elsewhere in the Code. (a) raceway (b) cable (c) trench (d) all of these
(D) ALL OF THESE
Cable wiring methods shall not be used as a means of support for ________ (a) other cables (b) raceways (c) nonelectrical equipment (d) all of these
(D) ALL OF THESE
Conductors in ferrous metal raceways or enclosures shall be arranged so as to avoid heating the surrounding ferrous metal by alternating-current induction. To accomplish this, the ______ conductor(s) shall be grouped together (a) phase (b) grounded (c) equipment grounding (d) all of these
(D) ALL OF THESE
Cables or raceways installed using directional boring equipment shall be ______ for this purpose. (a) marked (b) listed (c) labeled (d) approved
(D) APPROVED
Where direct-buried conductors and cables emerge from grade, they shall be protected by enclosures or raceways to a point at least _______ ft above finished grade. (a) 3 (b) 6 (c) 8 (d) 10
(C) 8
Where portions of a cable raceway or sleeve are subjected to different temperatures and condensation is known to be a problem, the _______ shall be filled with an approved material to prevent the circulation of warm air to a colder section of the raceway or sleeve. (a) raceway (b) sleeve (c) a or b (d) none of these
(C) A OR B
Openings around electrical penetrations into or through fire-resistant-rated walls, partitions, floors or ceilings shall _____ to maintain the fire-resistance rating. (a) be documented (b) not be permitted (c) be firestopped using approved methods (d) be enlarged
(C) BE FIRESTOPPED USING APPROVED METHODS
At least ________ support method(s) shall be provided for each conductor at the top of the vertical raceway or as close to the top as practical if the vertical rise exceeds the values in Table 300.19 (A)
(A)
For locations not specifically identified in Table 300.5, a cover depth of _______ in. shall be permitted for pool, spa, and fountain lighting, installed in a nonmetallic raceway, limited to not more than 30v where part of a listed low-voltage lighting system. (a) 6 (b) 12 (c) 18 (d) 24
(A) 6
Electrical wiring within the city of a fire-rated floor-ceiling or roof-ceiling assembly shall not be supported by the ceiling assembly or ceiling support wires. (a) True (b) False
(A) TRUE
Fittings and connectors shall be used only with the specific wiring methods for which they are designed and listed. (a) True (b) False
(A) TRUE
In general, areas where acids and alkali chemicals are handled and stored may present corrosive conditions, particularly when wet or damp. (a) True (b) False
(A) TRUE
Raceways, cable trays, cablebus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, fittings, supports, and support hardware shall be of materials suitable for ______ (a) corrosive locations (b) wet locations (c) the environment in which they are to be installed (d) none of these
(C) THE ENVIRONMENT IN WHICH THEY ARE INSTALLED
Independent support wires used for the support of electrical raceways and cables within bonfire-rated assemblies shall be distinguishable from the suspended-ceiling framing support wires. (a) True (b) False
(A) TRUE
Prewired raceway assemblies shall be used only where specifically permitted in the NEC for the applicable wiring method. (a) True (b) False
(A) TRUE
Raceways shall be provided with expansion, expansion-deflection, or deflection fittings where necessary to compensate for thermal expansion, deflection and contraction. (a) True (b) False
(A) TRUE
Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered a ______ location. (a) wet (b) dry (c) damp (d) corrosive
(A) WET
When the opening to an outlet, junction, or switch point is less than 8 in. in any dimension, each conductor shall be long enough to extend at least ______ in. outside the opening of the enclosure. (a) 1 (b) 3 (c) 6 (d) 12
(B) 3
When installed under metal-corrugated sheet roof decking, cables, raceways, and enclosures are permitted in concealed locations of metal-corrugated sheet decking type roofing if they are at least 2 in. away from a structural support member. (a) True (b) False
(B) FALSE
When installed under metal-corrugated sheet roof decking, the rules for spacing from decking apply equally to rigid metal conduit and intermediate metal conduit (a) True (b) False.
(B) FALSE
Ferrous metal raceways, boxes, fittings, supports, and support hardware can be installed in concrete or in direct contact with the earth or other areas subject to severe corrosive influences, where ______ approved for the condition. (a) the soil is (b) made of material (c) the qualified installer is (d) none of these
(B) MADE OF MATERIAL
A listed expansion/deflection fitting or other approved means shall be used where a raceway crosses a ______ intended for expansions, contraction or deflection used in buildings, bridges, parking garages, or other structures. (a) junction box (b) structural joint (c) cable tray (d) unistrut hanger
(B) STRUCTAL JOINT
Direct-buried service conductors that are bit encased in concrete and that are buried 18 in. or more below grade gal have their location identified by a warning ribbon placed in the trench at least _______ in. above the ungrounded installation. (a) 6 (b) 10 (c) 12 (d) 18
(C) 12
When installing PVC conduit underground without concrete cover, there shall be a minimum of ________ in. of cover. (a) 6 (b) 12 (c) 18 (d) 22
(C) 18
Where raceways contain insulated circuit conductors _____ AWG and larger, the conductors shall be protected from abrasion during and after installation by a fitting that provides a smooth, rounded insulating surface. (a) 8 (b) 6 (c) 4 (d) 2
(C) 4
Direct-buried conductors, cables, or raceways, which are subject to movement by settlement or frost, shall be arranged to prevent damage to the _______ or to equipment connected to the raceways. (a) siding of the building mounted on (b) landscaping around the cable or raceways (c) enclosed conductors (d) expansion fitting
(C) ENCLOSED CONDUCTORS
Each direct-buried single conductor cable shall be located _______ in the trench to the other single conductor cables in the same parallel set of conductors, including equipment grounding conductors. (a) perpendicular (b) bundled together (c) in close proximity (d) spaced apart
(C) IN CLOSE PROXIMITY
For locations not specifically identified in Table 300.5, a lesser cover depth than required in Column 5 shall be permitted where specified in the installation instructions of a (n) ______ low voltage lighting system. (a) approved (b) labeled (c) listed (d) none of these
(C) LISTED
All conductors of the same circuit shall be _______, unless otherwise specifically permitted in the Code. (a) in the same raceway or cable (b) in close proximity in the same trench (c) the same size (d) a or b
(D) A OR B
Aluminum raceways, cable trays, cablebus, auxiliary gutters, cable armor, boxes, cable sheathing, cabinets, elbows, couplings, nipples, fittings, support, and support hardware ______ shall be provided with supplementary corrosion protection (a) embedded or encased in concrete (b) in direct contact with the earth (c) likely to become energized (d) a or b
(D) A OR B
Where nonmetallic wiring methods are subject to exposure to chemicals solvents or vapors, they shall be inherently resistant to chemicals based upon their being ________ for the specific chemical reagent (a) listed (b) identified (c) a and b (d) a or b
(D) A OR B
Where type NM cables pass through cut or drilled slots or holes in metal meters, the cable shall be protected by ______ which are installed in the opening prior to the installation of the cable and which securely cover all metal edges. (a) listed bushing (b) listed grommets (c) plates (d) a or b
(D) A OR B
Conductors installed in nonmetallic, raceways run underground shall be permitted to be arranged as _______, installations. The raceways shall be installed in close proximity, and the conductors shall comply with the provisions of 300.20 (B). (a) neutral (b) grounded conductor (c) isolated phase (d) all of these
(D) ALL OF THESE
The number and size of conductors permitted in a raceway is limited to _________ (a) a permit heat to dissipate (b) prevent damage to insulation during installation (c) prevent damage to insulation during removal of conductors (d) all of these
(D) ALL OF THESE
Wiring methods permitted in the ceiling areas used for environmental air include ______ (a) electrical metallic tubing (b) FMC of any length (c) RMC without an overall nonmetallic covering (d) all of these
(D) ALL OF THESE
Conductors of ac and dc circuits, rated 1,000V or less, shall be permitted to occupy the same _______ provided that all conductors have an insulation rating equal to the maximum voltage applied to any conductor. (a) enclosure (b) cable (c) raceway (d) any of these
(D) ANY OF THESE