Article 300
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.
(B) 12 IN.
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
???
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) 1/16 B) 1/8 C) 1/4 D) 1/2
A) 1/16
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) 1/16 B) 1/8 C) 1/4 D) 1/2
A) 1/16
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
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
Conductors in raceways shall be _____ between outlets, boxes, devices, and so forth. A) Continuous B) Installed C) Copper D) In conduit
A) Continuous
A box or conduit body shall not be required for conductors in handhole enclosures, except where connected to electrical equipment. A) True B) False
A) True
A box or conduit body shall not be required for splices and taps in direct-buried conductors and cables as long as the splice 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 where 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
Conductors shall be installed within a raceway, cable or enclosure 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
Electrical wiring within the cavity 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 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
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
Raceways, cable assemblies, boxes, cabinets, and fittings shall be securely fastened in place. A) True B) False
A) True
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
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
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) Nipples D) Separately derived systems
A) installed complete
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° away from
A) not less than 1¼ in. from
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 1/16 in. from D) 90° away from
A) not less than 1¼ in. from
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
The interior of underground raceways shall be considered a _______ location. A) wet B) dry C) damp D) corrosive
A) wet
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
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
When 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 ________ outside the opening of the enclosure A) 0 in B) 3 in C) 6 in D) 12 in
B) 3 in
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
"_______" 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
Ceiling supported wires for the support of electrical raceways and cables within nonfired-rated assemblies shall be distinguished from the suspended-ceiling framing support wires. A) True B) False
B) False
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
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
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
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 of environmental air (plenum), 300.22(C)
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
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
Metal or nonmetallic raceways, cable armors, and cable sheaths ________ between cabinets, boxes, fittings or other enclosures or outlets. A) Can be attached with electrical tape B) are allowed gaps for expansion C) Shall be continuous D) none of these
C) Shall be continuous
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
________ 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
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
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
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
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 to be installed
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.
Metal raceways shall not be_______by welding to the raceway. A) Supported B) Terminated C) Connected D) All of these
D) All of these
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) Connected D) All of these
D) All of these
The number and size of conductors permitted in a raceway is limited to _____. A) permit heat to dissipate B) prevent damage to insulation during installation C) removal of conductors D) All the above
D) All the above
Backfilled used for underground wiring shall not A) Damage the wiring method B) Prevent compaction of the fill C) Contribute to the corrosion of the raceway D) All these
D) All these
When installing direct buried cables, a ___________ shall be used at the end of a conduit that terminates underground. A) Splice kit B) Terminal Fitting C) Bushing D) B or C
D) B or C
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
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
Nonmetallic raceways, cable trays boxes, cables with a non metallic outer jacket, 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
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 for the chemical B) identified as sunlight resistant 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
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
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
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
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 600V 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
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
Cables or raceways installed using directional boring equipment shall be ______ for this purpose. A) marked B) listed C) labeled D) approved
D) approved
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