NCCER Electrical Lv 1 Module 9 Conductors and Cables Questions and Answers

The slandered system of wire sizes in the United Stated is known as the _______. American Wire Gauge (AWG) system Wire sizes of No._ or larger are shown only as stranded. No.6 The purpose of stranding is to increase ________. The Flexibility of the wire A circular mil is a circle that has a diameter of ______. 1 mil A mil is ____. 0.001 inch Aluminum conductors have a _______. Higher resistance The conductivity of aluminum is approximately ______ that of copper. 2/3 The grounding conductor may be _____. bare, green, or green with a yellow stripe Type NM and Type NMC is widely used for ______ branch circuits and feeders in residential and commercial systems. What is Romex Cable? Nonmetallic sheathed cable consists of two or more plastic-insulated conductors and ground wire surrounded by a moisture resistant plastic jacket. Can be used in wood stud residential buildings and buildings not exceeding three stories (as long as it is used and protected with wood studs). If a conductor has a low resistance, it _______. has a high conductivity Telephone wiring in a plenum space is likely to use _______. Teflon insulation Using NEC Table 402.5, the allowable ampacity of No.14 AWG fixture wire is ___. 17 amps The temperature rating of services rating of service-entrance cable when the cable is not marked otherwise is_____. 75 degrees Cel(167 degrees Fharen) Which of the following is the most common type of jacket? Polyethylene Which of the following is true when pulling conductors? If a pull is expected to be difficult, a pull line should be used rather than a fish tape. Large conductors are likely to require the use of _____. Electrically driven power pullers. The maximum size sold wire that should be terminated in pull boxes and disconnects is ____. No.8 Compact stranding is used _______. With aluminum conductors The ampacity ratings of conductors can be found in _______. NEC Tables 310.16 through 310.21 To determine the ampacity of copper conductors where conductors are used as a single conductor in free air at ambient temperatures of 30 degrees Cel (86 degrees Fharn), use_______. NEC Table 310.17 Polyethylene (PE) is used primarily for insulation of control and communication wiring A type of thermoset insulation is _______. RHW(Weather-Rated, Heat-Rated, Rubber 75 degrees C/167 degrees F) 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 What service conductor may be bare, green, or green with a yellow strip? The grounding conductor of a multi-conductor cable What are the colors of insulation on the conductors for a three-conductors NM cable? One white or gray, one red, one black, and a grounding conductor. In some cases, fixture wires may be used for _____. Signaling wiring The difference between AC cable and MC cable is _______. AC cable has fire-retardant paper wraps on individual conductors; MC cable does not Type USE cable can be used for ? Underground installation including direct burial When used as a service-entrance cable, Type SE cable must be installed as specified in _______. NEC Article 230 To prevent unwanted ground loops, instrumentation cable shielding is _______. Not grounded at both ends of the wire Ideally, a pull should be made in ________. One continuous operation A conductor's _______ is the current the conductor can carry continuously without exceeding its temperature rating. Ampacity On a cable puller, the ______ is the part on which the pulling rope is wrapped and pulled. Capstan During a pull, cable may be attached to the pulling rope using a(n) _______________. Wire grip A(n) ______ is a manually operated device that is used to pull a wire through conduit. Fish tape Composed of foam rubber, a(n) ________ fits inside a piece of conduit and is propelled by compressed air or vacuumed through the conduit run, pulling a line or tape. Mouse The designation for one thousand circular mils is _____. Kcmil _______ is the maximum current in amperes a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Ampacity Which of the following represents the largest wire size? A. 50 B. 10 C. 5 D. 4/0 D.4/0 Polyethylene is used primarily for insulation of ________. Control and communications wiring