Deck 11: Cable Installation

Question 1

In attics not accessible by permanent stairs or ladders, Type NM cable installed across the top of floor joists within __________ of the scuttle hole must be protected by means such as guard strips.

A) 3 feet
B) 5 feet
C) 6 feet
D) 7 feet

Answer 1

C

Question 2

Type NM cable is considered to be supported when it passes horizontally through bored or punched holes in framing members that are no more than 4-1/2 feet apart.

Answer 2

True

Question 3

The NEC requires insulated staples to be used when securing and supporting Type NM cable.

Answer 3

False
Some AHJs require the use of insulated staples but the NEC does not.

Question 4

Even though the NEC permits Type NM cable to be used in one- and two-family homes, it may not be approved for use in your area by the AHJ.

Question 5

If a hole is bored through a stud and there is less than 1-1/4 inch between the edge of the hole and the edge of the stud, a steel plate at least 1/16-inch thick or a listed and marked steel plate that is less than 1/16 inch if it still provides equal or greater protection against nail or screw penetration, must be used.

Question 6

Suspended ceiling grids are permitted by the NEC to support nonmetallic sheathed cables.

Question 7

Most engineered I-beams come from the manufacturer with perforated knockouts that allow an electrician to remove the knockout and install cables through the holes.

Question 8

Type AC cable installed in thermal insulation must have conductors rated at 90°C (194°F).

Question 9

Type NM cable installed in either a metal or plastic two-gang device box with interior cable clamps, must be secured no more than __________ from the device box.

A) 6 inches
B) 8 inches
C) 10 inches
D) 12 inches

Question 10

A "homerun" may enter a loadcenter through knockouts in the back, sides, top, or bottom of the loadcenter.

Question 11

When service entrance cable is used as a wiring method for branch circuits, the only conductor permitted to be bare is the equipment grounding conductor.

Question 12

Type NM cable must be secured at no more than __________ inches from all electrical boxes except a nonmetallic single-gang box.

A) 6
B) 8
C) 10
D) 12

Question 13

The electrician can incorporate waste from the rough-in and trim-out wiring phases into the jobsite-recycling system.

Question 14

Which of the following is not a type of nonmetallic sheathed cable?

A) Type NM
B) Type NM-B
C) Type NMC
D) Type NM-U

Question 15

The inner edge of any bend in Type NM cable cannot be less than __________ times the cable diameter.

A) 6
B) 5
C) 4
D) 3

Question 16

Cables run along the sides of framing members must be installed at least __________ from the nearest edge of studs, joists, or rafters.

A) 3 inches
B) 6 inches
C) 1-1/4 inches
D) None of the above

Question 17

During the rough-in wiring phase, an electrician always installs cable through floors or ceilings, which provides shorter routes than do perimeter walls.

Question 18

Service entrance cable with an uninsulated conductor (Type SEU) is permitted to be used as the branch circuit wiring method for an electric range.

Question 19

Type NM and Type UF cables must have their cable sheath extend into nonmetallic boxes and beyond any cable clamp at least 1/2 inch (6 mm).

Question 20

The insulated anti-short fitting that is required to be installed in the ends of Type AC cable to protect the wires from abrasion is typically called a(n) __________.

A) orange head
B) red head
C) blue devil
D) blue head

Question 21

When installing Type NM cable into a single-gang nonmetallic device box, the cable must be secured no more than __________ from the box.

A) 8 inches
B) 10 inches
C) 12 inches
D) None of the above

Question 22

When installing Type MC cable in a house, an anti-short bushing (red head) is required at each end to provide protection for the conductors from the sharp edges of the cable armor.

Question 23

Type MC cable containing four or fewer conductors sized 14, 12, and 10 AWG must be secured within 12 inches from every box and then must be supported at intervals not exceeding __________.

A) 4.5 feet
B) 5 feet
C) 6 feet
D) 7 feet

Question 24

The part of a branch circuit that originates in the loadcenter and provides electrical power to the first electrical box in a circuit is called a __________.

A) ground out
B) home run
C) fly ball
D) strike out

Question 25

Manufacturers of Type NM cable are typically color code their cables.The color typically used for 12 AWG Type NM cable is __________.

A) red
B) blue
C) yellow
D) orange

Question 26

Type MC cable with an interlocked armor or corrugated sheath cannot be bent to a radius of less than __________ times the external diameter of the metallic sheath.

A) 3
B) 5
C) 7
D) 9

Question 27

Electricians commonly refer to Type AC cable as ____________________ cable.

Question 28

Unrolling cable from a coil is very easily done with a device commonly called a __________.

A) spinner
B) roller
C) reel jack
D) fish tape

Question 29

Which of the following cables are not permitted to be secured directly to the bottom edge of joists in an unfinished basement?

A) 6/2 Type NM cable
B) 6/3 Type NM cable
C) 8/2 Type NM cable
D) 8/3 Type NM cable

Question 30

Where passing through a floor and located on the outside of a wall, Type NM cable must be enclosed in rigid metal conduit, intermediate metal conduit, electrical metallic tubing, Type RTRC marked with the suffix-XW, or Schedule 80 rigid PVC conduit extending at least ____________________ inches above the floor.

Question 31

In single-gang nonmetallic electrical device boxes, at least __________ of the Type NM cable sheathing must extend into the box.

A) 1/8 inches
B) 1/4 inches
C) 1/2 inches
D) 3/4 inches

Question 32

Type AC cable must be supported at intervals not exceeding ____________________ feet along the run.

Question 33

The radius of the curve of the inner bend in Type AC cable must not be less than __________ times the diameter of the cable.

A) 3
B) 4
C) 5
D) 6

Question 34

The NEC requires at least __________ of free conductor in electrical device boxes for connection to switches and receptacles.

A) 6 inches
B) 8 inches
C) 10 inches
D) 12 inches

Question 35

Type NM cable is often purchased in __________-foot rolls that are packaged in plastic wrapping or in cardboard boxes.

A) 100
B) 150
C) 250
D) 1000

Question 36

When unrolling cable from a coil, the best way is to pull the cable out of the coil from the __________.

A) outside of the coil
B) inside of the coil
C) underside of the coil
D) None of the above

Question 37

If a cable is placed in a notch in wood studs or other wood framing members, a steel plate at least ____________________-inch thick must be used to protect the cable.

Question 38

The maximum distance between supports for a Type NM cable is __________.

A) 3 feet
B) 4-1/2 feet
C) 6 feet
D) 10 feet

Question 39

All of the following cable types are typically used in residential wiring except __________.

A) Type NM
B) Type AC
C) Type MI
D) Type MC

Question 40

If Type AC is run through a hole in a framing member that has an edge closer than ____________________ inch(es) to the edge of the framing member, it must be protected by a metal plate at least 1/16-inch thick.

Question 41

Explain why the sheathing of nonmetallic sheathed cable should extend into the device box or beyond the cable clamp approximately 1/4 inch.

Question 42

Explain why you do not overtighten the clamp of a metal cable connector when securing a cable to an electrical enclosure.

Question 43

Explain the use of running boards in unfinished basements.

Question 44

List the type of protection that must be used when installing Type NM cable through bored or punched holes in metal studs.

Question 45

Explain why two-wire Type NM cable cannot be stapled on edge.

Question 46

Explain what a "jug handle" is.

Question 47

Section 334.80 covers the ampacity of Type NM cable.It states that even though the cable's insulation is rated at 90°C (194°F) the allowable ampacity of the cable is taken from the _____°C column in Table 310.15(B)(16).

Question 48

Where three or more Type NM cables containing two or more current carrying conductors are installed in contact with thermal insulation without maintaining spacing between the cables, the allowable ampacity must be adjusted for more than three current carrying conductors using Table __________.

Question 49

Where three or more Type NM cables containing two or more current carrying conductors are installed without maintaining spacing between the cables, through the same hole in wood framing members that is to be sealed with thermal insulation, caulk, or sealing foam, the allowable ampacity must be adjusted for more than three current carrying conductors using Table __________.