Deck 5: Raceways and Conductors

Question 1

Liquidtight flexible metal conduit (LFMC) is a raceway of circular cross section having a(n) ____ over an inner flexible metal core.

A) outer liquidtight, nonmetallic, sunlight-resistant jacket
B) inflexible PVC coating
C) immersible (water tight) surface
D) sunlight-resistant, rigid, metallic outer jacket

Answer 1

A

Question 2

Raceways installed within drop ceilings must ____.

A) be grounded internally to support wires
B) have adequate ventilation on all sides
C) have secure support provided by the support wires and associated fittings
D) be connected directly to a junction box

Answer 2

C

Question 3

Electric metal tubing (EMT) provides protection from ____.

A) all but severe physical damage
B) inadvertent grounding
C) water damage
D) lightening

Answer 3

A

Question 4

____ in the ends of larger conduits (2 to 6 in.) can prevent conduit collapses or other deformities.

A) Mounting supports
B) Mounting threaded ends
C) Installing elbows
D) Installing PVC plugs

Question 5

Electrical metallic tubing must not be ____.

A) colored
B) threaded
C) bent
D) placed in drywall

Question 6

A group of conductors that fit into one conduit may not fit into another type because the ____ of different types of conduit vary.

A) interfaces
B) spacing requirements
C) internal diameters
D) carrying capacity

Question 7

Article 100 defines raceway as a(n) ____designed expressly for holding wires, cables, or busbars.

A) bracketed suspension system
B) enclosed channel of metallic (or nonmetallic) materials
C) polymer-based vertical conduit
D) metallic duct

Question 8

NEC identifies ____ types of rigid PVC conduit.

A) two
B) three
C) five
D) ten

Question 9

Flexible metal conduit (FMC) is a raceway of circular cross section made of ____.

A) PVC laminated steel
B) helically wound, formed, and interlocked metal strips
C) concentrically wound aluminum alloy
D) interlocking metal and PVC conglomerate

Question 10

Contact of dissimilar metals (except for the combination of aluminum and steel) should be avoided wherever possible to lessen the potential for ____.

A) galvanic action
B) inadvertent shorting
C) structural weakening
D) static charging

Question 11

The minimum approved electrical trade size for EMT is ____ inches.

A) .15
B) .25
C) .5
D) .75

Question 12

The equivalent of ____ is the maximum allowed between pull points.

A) one quarter bends (90° total)
B) two half bends (180° total)
C) three quarter bends (270° total)
D) four quarter bends (360° total)

Question 13

The definition for intermediate metal conduit (IMC) and rigid metal conduit (RMC) is ____.

A) listed by the UL
B) determined locally
C) essentially the same
D) explained in terms of differing diameters

Question 14

PVC bends must be made so that the conduit remains undamaged and the internal diameter of the conduit is ____.

A) not reduced
B) reduced by no more than one third
C) reduced by no more than one half
D) reduced by no more than two thirds

Question 15

Grounding conductors are required for circuits over ____ amperes.

A) 10
B) 20
C) 30
D) 40

Question 16

Surface nonmetallic raceways and their fittings must be designed so that sections can be mechanically coupled together and installed without subjecting the wires to ____.

A) bending
B) abrasion
C) compression
D) tension

Question 17

Rigid metal conduit (RMC) is a threadable raceway of ____ designed for the physical protection and routing of conductors and cables.

A) an incompressible material
B) circular cross section
C) galvanized steel
D) various bending radii

Question 18

Raceway fill calculations are a prerequisite in ____ needed for particular circuits.

A) circuit loads
B) material requirements
C) schematic requirements
D) determining the size of raceway

Question 19

All cut ends of IMC and RMC must be ____.

A) anchored in a junction box
B) welded
C) color coded
D) reamed

Question 20

Bends must be made so that the conduit or tubing remains undamaged with its internal diameter ____.

A) diminished by no more than a tenth
B) diminished by no more than half
C) diminished by no more than a third
D) basically undiminished

Question 21

Half-round and flat-top raceways not over 4 inches in width must be covered by ____ or more of concrete (or wood).

A) .25 inches
B) .5 inches
C) .75 inches
D) one inch

Question 22

Underfloor raceway dead ends must be ____.

A) open
B) accessible
C) closed
D) non-accessible

Question 23

Splices and taps are permitted within surface metal raceway having a removable cover that ____.

A) is accessible at another junction
B) contains a trap facility
C) contains a branch to a junction box
D) remains accessible after installation

Question 24

A header is a transverse raceway ____.

A) that forms a continuous, unbroken conductor connecting individual outlets
B) in a cellular metal floor, that may be approved as enclosures for electric conductors
C) within rigid tubing enclosed in tubular space whose axis is parallel to the axis of a metal floor member
D) for electric conductors, providing access to predetermined cells of a cellular metal floor

Question 25

Wireways are ____ housing and protecting electric wires (and cables).

A) conductors for signaling circuits between a motor
B) troughs with hinged or removable covers for
C) ceiling fixtures connecting to luminaires or
D) current carrying junction boxes

Question 26

A multiconductor cable, optical fiber cable, or flexible cords of two or more conductors is treated as ____ for percentage conduit fill area calculations.

A) two conductors
B) three conductors
C) a single conductor
D) a neutral node