Master Electrician Exam Questions and Answers 100% Correct(RATED A+)

In a farm building where livestock is housed and an equipotential plane system is required because wire mesh or other conductive elements are embedded or placed under concrete and bonded to metal structures that could become energized, the equipotential plane is necessary to minimize _____ differences within the plane. - ANSWER-voltage When exceptions are not to be considered, the MINIMUM voltage allowed at the line terminals of a 480-volt, three-phase, fire pump controller under motor starting conditions shall be ___. - ANSWER-408 volts For either overhead or underground primary distribution systems exceeding 1,000 volts on private property, the service disconnecting means shall be _____. - ANSWER-permitted to be located in a location that is not readily accessible All 125-volt, 15- and 20-ampere rated receptacles located within NOT more than _____ of the inside walls of a storable swimming pool or hot tub shall be protected by a ground-fault circuit interrupter. - ANSWER-20 feet Given: A single rigid metal conduit (RMC) contains only the following three (3) circuits on the load side of the service overcurrent protection devices: * two (2) 150-ampere, three-phase circuits* one (1) 300-ampere, single-phase circuitThe load side equipment bonding jumper for this conduit must be a MINIMUM size _____ copper. - ANSWER-4 AWG Determine the conductor ampacity given the following related information: • ambient temperature of 44ºC• 250 kcmil THWN copper conductors• four (4) current-carrying conductors in the raceway• length of raceway is 30 feet - ANSWER-167 amperes When exceptions are not applicable, the MINIMUM size common copper grounding electrode conductor for a separately derived alternating current electrical system with three (3) paralleled sets of size 300 kcmil copper secondary conductors shall be _____. - ANSWER-3/0 AWG The MINIMUM spacing required between the bottom of a 600 volt rated switchboard and noninsulated busbars mounted in the switchboard cabinet is _____ . - ANSWER-10 inches Cables or raceways installed using directional boring equipment shall _____. - ANSWER-be approved for the purpose Given: A 90-ampere, 240-volt, single-phase load is located 225 feet from a panelboard and is supplied with size 3 AWG THWN copper conductors. What is the approximate voltage-drop on this circuit? (K = 12.9) - ANSWER-10 volts Where a retail shopping mall has multiple tenant spaces, each occupant shall have access to the main disconnecting means, EXCEPT when _____. - ANSWER-the service and maintenance are provided by the building management At an outdoor motor fuel dispensing facility, the area up to eighteen (18) inches above grade and within twenty (20) feet horizontally from the edge of a LPG dispenser enclosure shall be classified as _____ hazardous location. - ANSWER-Class I, Division 1