Deck 6: Wiring Methods

Question 1

When may liquidtight flexible nonmetallic conduit be used?

Answer 1

LFNC may be used:
∙ in exposed or concealed locations.
∙ if flexibility or protection from liquids is required.
in hazardous (classified) locations where specifically approved or permitted such as by
∙ NEC 501.10(B), 502.10, 503.10, and 504.20.
∙ for direct burial, if so listed and marked.
∙ if not subject to physical damage.
∙ if the combination of ambient and conductor temperature does not exceed that for which the
LFMC is approved.
∙ with fittings identified for use with the LFMC.
∙ in trade sizes 1/2 to 4.For enclosing motor leads, trade size 3/8 is suitable.
for "fixture whips" not less than 18 in.(450 mm) or over 6 ft (1.8 m) in length permitted or
• required by NEC 410.117(C), or for flexible connection to equipment such as a motor.
∙ under raised floors in information technology rooms, as provided in NEC 645.5(D)(2).

Question 2

Conduit bodies are often referred to in the trade as "Condulets" and " ."

A)Applets
B)Hindslets
C)Unilets
D)Monolets

Answer 2

C

Question 3

Where PVC conduit is connected to a box or enclosure, a is recommended.

A)snap switch
B)faceplate
C)male connector
D)box adapter

Answer 3

D

Question 4

Liquidtight flexible nonmetallic conduit marked as has a smooth seamless inner core and cover bonded together and one or more reinforcement layers between the core and covers for layered conduit.

A)LFNC-A
B)LFNC-B
C)LFNC-C
D)LFNC-D

Question 5

Voltage drop in a circuit is calculated by multiplying the current flow times the .

A)impedance
B)capacitance
C)resistance
D)inductive reactance

Question 6

Compression fittings for EMT are classified as raintight and -tight types.

A)snow
B)concrete
C)hail
D)air

Question 7

boxes are used primarily to install ceiling outlets.

A)Trade size 4×4 square
B)Octagonal
C)Trade size 3×3 square
D)Masonry

Question 8

Proof of the flux cancellation principle can be demonstrated using a clamp-on .

A)ohmmeter
B)megohmmeter
C)ammeter
D)voltmeter

Question 9

Of what must you be especially careful regarding the depth of the box you are using?

Question 10

What factors cause losses in ferrous raceways in an ac circuit?

Question 11

What is a running thread, and how can it be used?

Question 12

The two most popular types of PVC are Schedule 40 and Schedule .

A)42
B)60
C)75
D)80

Question 13

is a thin-wall metal raceway that is not permitted to be threaded.

A)Rigid metal conduit (RMC)
B)Intermediate metal conduit (IMC)
C)Electrical metallic tubing (EMT)
D)Unthreaded metal conduit (UMC)

Question 14

When a box contains fittings such as luminaire studs, clamps, or hickeys, the number of conductors permitted in the box is one less for ____ device.

A)every other
B)each type of
C)each individual
D)every two types of

Question 15

Flexible metal and nonmetallic conduit are commonly used to connect recessed or lay-in .When used in this manner, electricians refer to it as a "fixture whip."

A)raceways
B)outlets
C)faceplates
D)luminaires

Question 16

A(n) box is used for surface or concealed installations.

A)trade size 4×4 square
B)octagonal
C)trade size 3×3 square
D)masonry

Question 17

On what factors do the conduit and tubing size required for an installation depend?

Question 18

Type MC cable is a factory assembly of one or more insulated circuit conductors with or without optical fiber members enclosed in an armor of metal tape, or a smooth or corrugated metallic sheath.

A)interlocking
B)twisted
C)thin
D)flame-retardant

Question 19

The term is defined by the NEC as a channel that is designed and used expressly for the purpose of holding wires, cables, or busbars.

A)raceway
B)conduit
C)thread
D)rigid tubing

Question 20

When pulling three conductors or cables into a raceway, if the ratio of the raceway diameter to the conductor diameter is between 2.8 and 3.2, jamming can occur.With or more conductors or cables, jamming is highly unlikely.

A)four
B)five
C)six
D)seven