electrical Electrical - Conductors and Cables!

Which size wire has the greatest cross-sectional area? a. 0 b. 00 c. 000 d. 0000

0000

The NEC specifies a minimum of for connections made to wiring devices or for splices. a. 4" b. 6" c. 8" d. lO"

6"

The difference between AC cable and MC cable is____. a. AC cable has a maximum of four conductors; MC has a maximum of six b. AC cable has a bonding strip; the MC ground is its metal cladding c. AC cable has fire-retardant wraps on individual conductors; MC cable does not d. AC cable is sized from 10 AWG to 4/O; MC issized from 18AWG to 2,000kcmil

AC cable has fire-retardant wraps on individual conductors; MC cable does not

The standard system of wire sizes in the United States is the ________. a. American Wire Gauge b. Birmingham Gauge c. Manufacturers' Foundation d. Manufacturers' Standard Gauge

American Wire Gauge

Type _______ cable is flat conductor cable. a. E b. MV c. FCC d. CC

FCC

In some cases, fixture wires may be used as a substitute for branch circuit conductors. a. True b. False

False

When feeding conductors into long runs of conduit, it is important to apply lubricant to the conductors only, and not to the conduit. a. True b. False

False

To determine the ampacity of copper conductors where conductors are used as a single conductor in free air at ambient temperatures of 3OC, use: a. NEC Table 310.16 b. NEC Table 310.17 c. NEC Table 310.18 d. NEC Table 310.19

NEC Table 310.16

The ampacity ratings of conductors can be found in,__. a. NEC Chapter l b. NEC Articles 348 through 352 c. NEC Tables 310.16 through 310.19 d. NEC Chapter 9

NEC Tables 310.16 through 310.19

What is the primary difference between NM and NMC cable? a. NM is for dry environments only; NMC is for both dry and damp locations. b. NM Is for exposed locations; NMC is for concealed locations. c. They are rated differently for the number of conductors allowed. d. NM cable is fire-retardant, while NMC is not.

NM is for dry environments only; NMC is for both dry and damp locations.

Type ____ cable is nonmetallic-sheathed cable. a. SE b. SIS c. NMS d. NMSC

NMS

The maximum size solid wire that should be terminated in pull boxes and disconnects is______. a. No.6 b. No. 8 c. No. 10 d. No.12

No. 8

What are the colors of insulation on the conductors for a three-conductor NM cable? a. One white or gray, one red, and one black b. Two white or gray and one red c. One white or gray, one red, one black, and a grounding conductor d. One green, one white or gray, one blue and a grounding conductor

One white or gray, one red, one black, and a grounding conductor

A type of thermoset insulation ¡s a. RHW b. THW c. THHW d. PVC

RHW

Type______ cable is power and control tray cable. a. THW b. THWN c. TW d. TC

TW

What service conductor may be bare, green, or green with a yellow stripe? a. The grounding conductor of a multi-conductor cable b. The neutral conductor of a multi-conductor cable c. The ungrounded conductor of a multi-conductor cable d. The high leg of a four-wire, delta-connected secondary

The grounding conductor of a multi-conductor cable

A conductor's size refers to the cross-sectional area of both the current-carrying wire and the insulation. a. True b. False

True

What letter must be included in the marking of a conductor if it is to be used in a wet, outdoor application? a. D b. O c. I d. W

W

Type SE cable may be used ________ . a. underground b. above ground and underground c. underground in non-hazrdous locations d. above ground only

above ground only

The grounding wire may be _______. a. red b. white ç. black d. bare

bare

A typical color used for the fourth conductor of a power cable is ______. a. pink b. yellow c. red d. blue

blue

Type NMC cable is suitable for all of the following except a. dry locations b. damp locations c. corrosive locations d. embedding in concrete

embedding in concrete

Type MC cable may be used _________. a. where subject to physical damage b. as direct burial cable c. in concrete d. for services, feeders, and branch circuits

for services, feeders, and branch circuits

Instrumentation wiring shielding is usually ________. a. grounded at every instrument b. grounded at one end only c. not grounded at all d. grounded by floating the ground at both ends of the wire

grounded at one end only

The purpose of stranding is to_____. a. reduce weight b. increase wìre flexibility c. add strength d. make the wire easier to insulate

increase wìre flexibility

NM and NMU cables may be ______. a. used in ducts and plenums b. installed exposed in the space above suspended ceilings c. used as service entrance cable d. installed in concealed locations

installed in concealed locations

Polyethylene (PE) is used primarily for a. the manufacture of TW and THW insulation b. insulation of control and communication wiring c. high-voltage cables d. high-temperature insulation

insulation of control and communication wiring

A factor not used in selecting conductors is tne conductor's _________. a. termination point b. site (diameter) c. length d. operating temperature

length

When conductors are led into long runs of conduit, it is important to_____. a. put back-tension on the conductors to prevent kinking b. fill the conduit with lubricant c. hold tension on the spools so that excess wire does not spill onto the floor d. make sure the wires are straight and do not cross over each other

make sure the wires are straight and do not cross over each other

All of the Following help to determine how good a material will be for the construction of wire except a. availability b. cost c. conductivity d. molecular weight

molecular weight

To prevent unwanted ground loops, instrument wiring is___ a. not grounded at both ends of the wire b. grounded at both ends of the wire c. floated on both ends d. always ungrounded

not grounded at both ends of the wire

A pulling line is usually made of: a. stranded wire b. wire rope c. steel tape d. nylon or other synthetic material

nylon or other synthetic material

Copper is the most widely used conductor because it __________. a. offers the lowest resistance b. is lightweight and inexpensive c. is easy to use d. offers low resistance and is easy to use

offers low resistance and is easy to use

The selection of fixture wire depends primarily on the _________. a. type of circuit control b. type of termination c. circuit color coding d. operating temperature of the circuit

operating temperature of the circuit

In the standard system of wire sizes in the United States, from No. 50 through No. 1, the larger the number, the __________. a. heavier the wire b. longer the wire c. smaller the wire d. larger the wire

smaller the wire

A conductor's operating temperature is not determined by a. ambient temperature b. current flow c. current flow in bundled conductors d. the number of conductor strands

the number of conductor strands

Type UF cable may be used _________. a. as a service entrance cable b. in commercial garages c. underground and in direct burial situations d. in hazardous locations

underground and in direct burial situations

Type USF cable can be used for a. aboveground installation only b. underground installation within a special PVC pipeline c. underground installation including direct burial d. indoor applications only

underground installation including direct burial

Cable markings show ________. a. suitable locations b. voltage rating c. definitions of color codes d. ampacity

voltage rating

Compact stranding is used _____. a. when installing larger conduit sizes b. when decreasing the ampacity of an existing service c. with aluminum conductors d. in corrosive environments

with aluminum conductors