420
c. 12
A 2400-volt lead-covered conductor can be bent up to ___ times its diameter.
c. 2001
Medium voltage cable insulation is rated for voltages ___ volts and higher. Select one: a. 600 b. 150 c. 2001 d. 1000
b. electrical metallic tubing
Wiring methods permitted in ducts or plenums specifically fabricated to transport environmental air include ___. Select one: a. flexible conduit methods of any length b. electrical metallic tubing c. armored cable (BX) d. nonmetallic-sheathed cable
b. 4 1/ 2'
Nonmetallic sheathed cable (NMC) must be supported at intervals not exceeding ___. Select one: a. 4' b. 4 1/ 2' c. 6' d. none of these
b. 12
Nonmetallic-sheathed cable must be secured within ___ inches from a two-gang plastic device box mounted in a wall. Select one: a. 6 b. 12 c. 18 d. 8 e. 36
a. 30 inches
Service cables mounted on the side of a building shall be supported at intervals not exceeding ___. Select one: a. 30 inches b. 3 feet c. 24 inches d. 4 1/ 2 feet
a. 35
The minimum bending radius for three-inch diameter integrated gas spacer cable is ___ inches. Select one: a. 35 b. 21 c. 45 d. 24 e. 18
c. 8
When a flat cable assembly is installed less than ___ feet from the floor, it shall be protected by a cover identified for the use. Select one: a. 12 b. 15 c. 8 d. 10
c. I & II only
All conductors of a circuit are required to ___. I. be in the same raceway II. be installed in close proximity in the same trench III. be the same size Select one: a. I only b. III only c. I & II only d. I, II & III
c. I or II only
An insulated conductor that is intended for use as a grounded conductor, where contained within a flexible cord, shall be identified by ___ or by other means permitted. I. a white or gray outer finish II. one or more white stripes on other than green insulation III. a green outer finish IV. a green outer finish with one or more yellow stripes Select one: a. III only b. III or IV only c. I or II only d. I only
a. I, II & III
Electric vehicle cable type EV ___. I. is available in sizes 18 AWG to 500 kcmil II. is rated for extra hard usage III. has thermoset insulation Select one: a. I, II & III b. III only c. I only d. II only
a. substantially increased
Electrical installations in hollow spaces, vertical shafts, and ventilation or air-handling ducts shall be so made that the possible spread of fire or products of combustion will not be ___. Select one: a. substantially increased b. exposed c. underrated d. allowed
b. damp locations
FCC systems may be used in ___. Select one: a. hospitals b. damp locations c. schools d. none of these
d. all of these
MI cable has ___. Select one: a. an outer sheath to provide mechanical protection b. solid copper conductors c. an adequate path for grounding purposes d. all of these
c. both I and II
Messenger supported wiring shall not be used ___. I. where subject to severe physical damage II. in hoistways Select one: a. I only b. II only c. both I and II d. neither I nor II
a. appliances
SE cable used to supply ___ shall not be subject to conductor temperatures in excess of the temperature specified for the type of insulation involved. Select one: a. appliances b. lighting c. generators d. motors
b. 20
The nominal gas pressure for IGS cable insulation shall be ___ pounds per square inch gauge. Select one: a. 10 b. 20 c. 15 d. 5
b. II only
Type MC cable shall not be used where exposed to ___ conditions. I. wet II. destructive corrosive Select one: a. I only b. II only c. either I or II d. neither I nor II
a. 6
Type MI cable shall be supported at intervals not exceeding ___ feet. Select one: a. 6 b. 10 c. 4 d. 2
d. 35,000
Type MV cables shall be permitted for use on power systems rated up to ___ volts. Select one: a. 2,300 b. 600 c. 4,160 d. 35,000
b. direct burial
Type UF cable shall be permitted for ___. Select one: a. embedding in concrete b. direct burial c. service entrance cable d. hoistways
b. I, II, or III
Type UF cable shall be permitted for interior wiring in ___ locations. I. dry II. wet III. corrosive Select one: a. I or III b. I, II, or III c. I or II d. I only
b. MC
Type ___ cable is a factory assembly of one or more conductors, each individually insulated and enclosed in a metallic sheath of interlocking tape, or a smooth or corrugated tube. Select one: a. MI b. MC c. MV d. AC
c. raceway
Underground cable installed under a building shall be in a ___ that is extended beyond the outside walls of the building. Select one: a. duct bank b. sleeve c. raceway d. gutter
a. 8
Underground service conductors carried up a pole must be protected from mechanical injury to a height of at least ___ feet. Select one: a. 8 b. 12 c. 9 d. 15
c. 7 in.
What is the MINIMUM bend radius for 1 in. diameter corrugated sheath MC cable? Select one: a. 12 in. b. 15 in. c. 7 in. d. 10 in.
c. 90ºC - 60ºC
When armored cable installed is installed in thermal insulation, the rating of the contained conductors shall be ___, and the ampacity of these applications shall be that of ___ conductors. Select one: a. 60ºC - 75ºC b. 75ºC - 90ºC c. 90ºC - 60ºC d. 90ºC - 75ºC e. 60ºC - 60ºC
c. end seal fitting
Where MI cable terminates, a(n) ___ shall be provided immediately after stripping to prevent the entrance of moisture into the insulation. Select one: a. boot b. connector c. end seal fitting d. bushing
a. I only
Which of the following statements about the protection of NM cable from physical damage is correct? I. When run across the top of floor joists in an accessible attic, the cable shall be protected by guard strips. II. When passing through a floor, the cable should be enclosed in Sch. 40 PVC extending at least 6 inches above the floor. Select one: a. I only b. II only c. either I and II d. neither I nor II
c. both I and II
Which of the following statements about the protection of nonmetallic sheathed cable from physical damage is correct? I. When passing through a floor the cable shall be enclosed in a pipe or conduit extending at least 6 inches above the floor. II. When run across the top of the floor joists in an accessible attic, the cable shall be protected by guard strips. Select one: a. I only b. II only c. both I and II d. neither I nor II
c. Rigid nonmetallic conduit
Which of the following wiring methods may be installed in notches cut into wood framing members without being protected by steel plate 1/ 16" thick? Select one: a. Metal clad cable b. Nonmetallic sheathed cable c. Rigid nonmetallic conduit d. Armored cable
d. 6
An office building has a 24-volt branch circuit installed for landscape lighting around the front of the building. The circuit was installed in UF cable which requires a minimum burial depth of ___ inches for this circuit. Select one: a. 12 b. 8 c. 24 d. 6
c. 1 1/ 4"
Bored holes in wood members for cable or raceway-type wiring shall be bored so that the edge of the hole is not less than ___ from the nearest edge. Select one: a. 1 1/ 16" b. 1" c. 1 1/ 4" d. 1 1/ 2"
c. either I or II
Cables of the AC type, except ACL, shall have an internal bonding strip of ___ in intimate contact with the armor for its entire length. I. aluminum II. copper Select one: a. I only b. II only c. either I or II d. neither I nor II
d. extensions of existing installations
Concealed knob and tube wiring shall be permitted to be used only for ___. Select one: a. accessible installations b. houses c. temporary wiring d. extensions of existing installations
d. I, II, or III
FCC cable shall consist of ___ flat copper conductors, one of which shall be an equipment grounding conductor. I. three II. four III. five Select one: a. I only b. II only c. III only d. I, II, or III
c. run through holes in walls
Flexible cords and cables shall NOT be ___. Select one: a. used to prevent transmission of vibration b. used as elevator cables c. run through holes in walls d. used as data processing cables
d. any of these
Flexible cords shall be connected to devices and to fittings so that tension will not be transmitted to joints or terminal screws. This shall be accomplished by ___. Select one: a. tying a knot in the cord b. using a special fitting designed for this c. winding the cord with tape d. any of these
c. transition assembly
Power feed, grounding connection, and shield system connection between the FCC system and other wiring systems shall be accomplished in a ___ identified for this use. Select one: a. top shield b. surface metal raceway c. transition assembly d. junction box e. protective layer
d. soldered
Splices in knob-and-tube wiring shall be ___ unless approved splicing devices are used. Select one: a. insulated b. protected c. crimped d. soldered e. enclosed
a. 60
The ampacity of UF cable shall be that of ___ degree C conductors. Select one: a. 60 b. 90 c. 85 d. 75
c. 60
The ampacity of types NM and NMC cable shall be that of ___ degree C conductors. Select one: a. 75 b. 90 c. 60 d. 140
c. distinctive
The grounded conductor of a mineral-insulated, metal-sheathed cable shall be identified at the time of installation by ___ marking at its terminations. Select one: a. neutral b. solid c. distinctive d. identified
b. 5
The radius of the inner edge of any bend in MI cable shall not be less than ___ times the diameter of the metallic sheath for cable not more than 3/ 4" in external diameter. Select one: a. 8 b. 5 c. 3 d. 10
a. insulating materials used in the end seal
The temperature limitations on which the ampacities of mineral-insulated, metal-sheathed, cable are based shall be determined by the ___. Select one: a. insulating materials used in the end seal b. highest ambient temperature surrounding the cable c. insulation of the cable d. composition of the outer sheath
d. I, II & III
The use of nonmetallic surface extensions is permitted in buildings ___. I. that do not exceed three floors II. occupied for office purposes III. occupied for residential purposes Select one: a. I only b. II only c. II & III only d. I, II & III
d. I & II only
Type AC cable shall be permitted for branch circuits and feeders in ___. I. concealed work II. exposed work III. hazardous locations Select one: a. II & III only b. I, II & III c. I & III only d. I & II only
b. 4 1/ 2
Type AC cable shall be secured by staples, cable ties, straps, hangers, or similar fittings at intervals not exceeding ___ feet. Select one: a. 2 b. 4 1/ 2 c. 10 d. 6 e. 3
e. I & III only
Type FCC cable shall be clearly and durable marked on both sides at intervals of not more than 24 inches with the information required by 310.120(A) and with what additional information? I. material of conductors and maximum ampacity II. rated frequency and number of phases III. maximum temperature rating Select one: a. II & III only b. I & II only c. I, II & III d. I only e. I & III only
c. carpet squares
Type FCC cable wiring system is designed for installations under ___. Select one: a. concrete b. carpet c. carpet squares d. title
a. 6 ft
Type MC cable shall be supported and secured at intervals not exceeding ___. Select one: a. 6 ft b. 1.8 ft c. 3 ft d. 4 1/ 2 ft
c. I & II only
Type SE service-entrance cables shall be permitted in interior wiring systems where all the circuit conductors of the cable are of the ___ type. I. thermoset II. thermoplastic III. metal Select one: a. I, II & III b. II & III only c. I & II only d. II only
a. 24
Unsupported runs of armored cable shall be permitted to be unsupported where the cable is not more than ___ inches at terminals where flexibility is necessary. Select one: a. 24 b. 30 c. 36 d. 48
d. 300
Voltage between the hot (ungrounded) conductors on FCC cable shall not exceed ___ volts. Select one: a. 600 b. 50 c. 150 d. 300
a. 5 or more times the diameter of the cable
When bending type NM cable, the tightest bend permitted by the NEC® has a radius of ___. Select one: a. 5 or more times the diameter of the cable b. 5 or less times the radius of the cable c. 5 or more times the radius of the cable d. 5 or less times the diameter of the cable
a. 12"
When using BX (armored cable), it shall be secured within ___ of every junction box, cabinet or outlet box. Select one: a. 12" b. 8" c. 6" d. 3"
d. bushing
Where installing direct-buried cables, a ___ shall be used at the end of the conduit where it terminates underground. Select one: a. connector b. coupling c. splice kit d. bushing
e. 7
Where run across the top of floor joists, or within ___ feet of the floor or floor joists across the face of rafters or studding, in an attic that has permanent stairs, nonmetallic sheathed cable must be protected by substantial guard strips that are at least as high as the cable. Select one: a. 3 b. 12 c. 6 d. 2 e. 7
b. one-half
Where screws are used to mount knobs, or where nails or screws are used to mount cleats, they shall be of a length sufficient to penetrate the wood to a depth equal to at least ___ the height of the knob and the full thickness of the cleat. Select one: a. 3 times b. one-half c. twice d. one-quarter
c. It may be fished in air voids in masonry block or tile walls.
Which of the following is true concerning type NM cable? Select one: a. It may be embedded in masonry, concrete, or plaster. b. It may be covered with plaster, adobe, or similar finish. c. It may be fished in air voids in masonry block or tile walls. d. It may be installed where exposed to corrosive fumes.
c. type AC armored cable
Which of the following may not be used in damp or wet locations? Select one: a. open wiring b. electrical metal tubing c. type AC armored cable d. rigid metal conduit
a. It may be used in any hazardous location.
Which of the following statements about MI cable is correct? Select one: a. It may be used in any hazardous location. b. It shall be supported every 10 feet. c. It may be mounted flush on a wall in a wet location. d. A single run of cable shall not contain more than four quarter bends.
d. electrical metallic tubing
Which of the following wiring methods is permitted through an air conditioning duct? Select one: a. Romex b. PVC c. no wiring method is permitted in an A/C duct d. electrical metallic tubing
c. NMC
___ cable shall be flame-retardant, moisture-resistant, fungus-resistant, and corrosion-resistant. Select one: a. MI b. NM c. NMC d. USE
c. MI
___ is a factory assembly of one or more conductors insulated with a highly compressed refractory mineral insulation and enclosed in a liquidtight and gastight continuous copper or alloy steel sheath.. Select one: a. MV b. MC c. MI d. TC e. IGS
a. AC armored cable
___ may not be used in damp or wet locations. Select one: a. AC armored cable b. Open wiring c. EMT d. Rigid steel conduit