Master Electrician Exam Questions and Answers 100% Accurate!

According to the National Electrical Code, the minimum size TW copper conductor for a 5 HP, 3 phase, 230 volt, squirrel cage motor started at full voltage shall not be less than # ___ AWG. - ANSWER-14 How many AWG #12 THHN conductors are allowed in a 1" RMC nipple? - ANSWER-35 wires How many AWG #12 THHN conductors are allowed in a 1" RMC? - ANSWER-26 #12 THHN conductors The circular mil area of a #18 AWG would be ___ CMILS for solid or stranded. - ANSWER-1620 According to Table 8 of the NEC and assuming solid uncoated copper conductor; cross-sectional area of 10,380 CM; resistance of 12.6 Ω/circular mill-foot (KF), calculate the conductors resistance at 75 degrees C. ("R" is resistance in Ohms, "L" is the length of the conductor. Use the formula: R=KL/CM.) - ANSWER-1.2 Ohm/1000 ft. Using the information in the National Electrical Code, table 8, calculate the total resistance of 495' of uncoated, 18 AWG, stranded, copper. - ANSWER-3.85 to 3.93 ohms A compressor motor is rated 1HP, 115V, 16 amps. It is connected to a receptacle providing 120 volts with a 100' extension cord. Due to the load conditions, the maximum voltage drop allowed during starting lockedrotor condition is 30% of motor voltage rating. Using 96 amps for locked-rotor current. Resistance equals impendence. Use resistance values in Table 8 & 9. What is the minimum size of uncoated copper? - ANSWER-10 AWG The cross-sectional area of a conductor is decreased by a factor of 4. What is the new conductor's resistance? - ANSWER-4 times resistance The circular mil area of a number 12 conductor is ____. - ANSWER-6530 The cross sectional area of a conductor is compared to a conductor that is four times its area. What is the approximate resistance of the larger conductor compared to the smaller? - ANSWER-1/4 resistance Eighteen, 250 KCMIL, THWN copper conductors are in a rigid metal conduit nipple. What is the minimum diameter in inches permitted by for the conduit? Assume that the conductors are not lead covered and the nipple is 1' in length. - ANSWER-5" What size RMC nipple (18" long) is required for 24, AWG #8 THHN? - ANSWER-1.25" Using Table 4 and Table 5 of the NEC, compute the maximum number of # 10 AWG, Type THHN, copper conductors allowed in 32' run of 1/2" "IMC". - ANSWER-6 What size EMT raceway is required for 24, AWG #6