Course Home Page ## 2008 NEC Refresher Part 1 Practice Test 1

Course Name:2008 NEC ReviewQuiz Number:No. 11Teacher: Gerald Newton Teacher's Home Page: http://www.electrician2.com Teacher's Email: electrician@electrician2.com

No. of Questions=20

1.For dwelling unit with a 240/120 single-phase service the frame of a 4,500 watt 240/120 volt clothes dryer shall be grounded by using the grounding conductor. The minimum size copper conductor is:a)No. 10 b)No. 8 c)No. 12 2.The minimum size copper equipment grounding conductor for a 200-ampere circuit is:a)No. 8 b)No. 6 c)No. 3 3.When not under concrete, rigid metal conduit must be buried under public highways and streets at least:a)24 inches b)18 inches c)6 inches d)4 inches 4.120-volt, 20-ampere GFCI protected residential branch circuit may be buriedat a minimum depth of :a)12 inches b)18 inches c)24 inches 5.The listed ampacities of 75 Degrees C. conductors in a raceway must be reduced when the ambient air temperature exceeds:a)60 degrees C. b)75 degrees C. c)90 degrees C. d)30 degrees C. 6.Horizontal nonmetallic wireways shall be supported where run horizontally at intervals not to exceed _________, and at each end or joint, unless listed for other support intervals. In no case shall the distance between supports exceed 3 m (10 ft).a)3 ft. b)5 ft. c)6 ft. 7.When NOT using a one-shot bender, the minimum radius of a field bend to the centerline of the conduit for 2-inch rigid metal conduit containing XHHW conductors is:a)9 1/2 inches b)12 inches c)15 inches 8.In a straight run, 2-inch rigid metal conduit with threaded couplings may be supported at intervals not exceeding:a)10 feet b)12 feet c)16 feet 9.The maximum size of electrical metallic tubing is:a)6-inch b)4-inch c)2-inch 10.For metallic and nonmetallic, auxiliary gutters must not be filled to greater than:a)20 % b)30 % c)40 % d)60 % 11.The multiplier for bending offsets is called the ________ of the angle used for the offset bends.a)sine b)cosine c)secant d)cosecant 12.The largest conductor allowed in a standard box without other restrictions is:a)No. 4 b)No. 8 c)No. 6 13.An Alternating-Current or Direct-Current General-Use Snap Switch may control what inductive load as a percentage of its ampere rating?a)80 % b)50 % c)75 % 14.The ampacity of No. 14 fixture wire is:a)8 amperes b)15 amperes c)17 amperes 15.When there are exposed live parts on both sides of the working space for a system operating at 480 volts the required distance between the equipment is:a)3 feet b)3 1/2 feet c)4 feet 16.Guarding by elevation for a 600-volt circuit requires an elevation of:a)8 feet b)6 1/4 feet c)8 1/2 feet 17.Conduit or fittings must not rise into the bottom of a switchboard enclosure more than:a)8 inches b)3 inches c)10 inches 18.Plug-in-type overcurrent protection devices that are backfed and used to terminate field-installed ungrounded supply conductors ________________ .a)are permitted if locked in place b)shall be secured in place by an additional fastener that requires other than a pull to release the device from the mounting means on the panel. c)do not require any additional hardware 19.For a center line radius of 20 inches and a 45 degree bend the developed length of the conduit is found by using the following formula:a)dl = 20 x 90 x 0.0175. b)dl = 20 x 45 x 0.0175. c)dl = 20 x 90 x tangent of 45 degrees 20.For a center line radius of 20 inches and a 90 degree bend the gain is:a)8.5 inches b)6 inches c)4.125 inches

Go to top of quiz © 2008 Gerald Newton