Master Electrician Exam Review Questions and Answers Latest Updated 2025 Graded A+

That portion of a wiring system extending beyond the final overcurrent device is called the: - branch circuit The final sum of the computed loads, based on the minimum code requirements, is the - Calculated load As compared to #10, a #8 wire of the same Iength has less: - Resistance One circular mil is the area of a circle whose diameter is: - 0.001 inch A round bus-bar one inch in diameter, has a circular mil area of: - 1,000,000 cm A copper wire with twice the diameter of another wire has a current carrying capacity: - four times as great The specific resistance of copper wire @ 20° C in ohms per circular mil ft. is - 10.4 Conductance of an electric circuit is that property that will: - permit current to flow The equivalent value of 0.1 mho is - 1O ohms The resistance of copper wire is: - directly proportional to its length The portion of a wiring system between a point of distribution and the branch circuit overcurrent device is - Feeder GFCI protection at a carnival is not required for equipment at circuit if the receptacle is of the ____________type - locking Where cables or nonmetallic raceways are installed through in joists, rafters, or wood members;holes shall be bored so that the edge of the hole is the nearest edge -of the wood member. - not less than 1 1/4 in. from To guard live parts over 50V but less than 600V, equipment is permitted to be - located on a balcony accessible only to qualified persons located in a room only accessible to qualified persons elevated 8 ft or more above floor or other working surface Overhead feeder conductors shall have a minimum __________ vertical clearance over residential property and driveways, as well as those commercial areas not subject to truck traffic, where the voltage is limited to 300 volts-to-ground. - 12Ft Where rear access is required to work on de-energized parts on the back of enclosed equipment, a minimum working space of horizontally shall be provided. - 36 inches What is the maximum run length of a 18AWG fixture wire that is tapped on to a 20 amp branch circuit? - 50' When the service disconnecting means is a power-operated switch or circuit breaker, it shall be able to be opened by hand in the event of a - power supply failure Conductors are considered outside a buildings when they are buried under not less than - 2 in of concrete In straight pull, the length of the box shall not be less than. ____times the trade size of the largest raceway. - 8 At least one receptacle outlet shall be installed within of the top of a show window for each 12 linear feet measured horizontally across its length - 18" Ground-fault protection of equipment shall be provided fro solidly grounded wye electrical services of more than 150 volts-to-ground, but not exceeding 600V phase-to..phase for each service disconnecting means rated - 1000A Receptacle outlets in floors shall not be counted as part of the required number of receptacle outlets unless located within ______ of the wall - 18" Exposed live parts of motors and controllers operating at or more between terminals shall be guarded against accidental contact by enclosure or by location - 50V Lighting track shall not be installed less than______ above the finished floor except' where protected from physical damage or where the track operates at less than 30 V rms, open-circuit voltage - 5' Each general care area patient bed location shall be provided with a minimum of_______receptacles, which can be single, duplex, or a combination with each duplex counting as two receptacles - 4 In a Dwelling Unit which appliance is allowed to have a 24" cord with attachment ground plug? - Combination Range hood/ Microwave oven At least_____ 125 V, single phase, 15 A or 20 A, duplex with groundfault circuit interrupter receptacle shall be provided in each elevator machine room and elevator machinery space. - 1 Lighting systems covered by Article 411 shall have a power supply rated not more than______and not more than 30V - 25A Temporary electrical power and lighting installations shall be permitted for a period not exceeding ____days for Christmas decorative lighting and similar purposes - 90 Lighting systems operating at 30V or less shall not be·installed within_______of pools, spas, fountains, or similar locatipns - 10' Where communications wires and cables and electric light or power conductors are supported by the same pole and are run paralled to each other in span , the·supply service drops of 0-750 volts running above and parallel to communications service drops shall have a minimum separation of _______inches at any point in the span, including the point of and at their attachment to the building, provided the nongrounded conductors are insulated and that a clearance of not less than_______ inches is maintained between the two services at the pole - 12 /40 Communications Wires and cables shall have a vertical clearance of not less the ______feet from all points of roofs above which they pass. - 8 MV cable rated 35 KV cannot be installed in - Cable Tray The grounding of communications wires should be run to the grounding electrode: - in a straight line Service Lateral conductors that supply power to limited loads of a single branch circuit-such as a small polyphase power, controlled water heaters, and similar loads-shall not be smaller than - 10 AWG Copper Dry type transformers installed indoors rated over._______ shall be installed in a vault. - 35KV Flat:top underfloor raceways over 4 inches, but less 8 inches wide, with a minimum 1 inch spacing between raceways, shall be covered with concrete to a depth of not iess than 1 inch. Raceways spaced less that 1 inch apart shall be covered with a concrete to a depth of - 1 1/2" For straight pulls, the length of a pull box shall not be less than _____ time the outside diameter, over the sheath, of the largest shielded ·or lead covered conductor or cable entering the box on systems over 600 volts - 48 times For switchboards that are not totally enclosed, a space of ____ or more shall be provided between toe top of the switchboard and any combustible ceiling - 36" A disconnecting means that serves a hermetic refrigerant motor compressor shall have an ampere rating of at least percent of the nameplate rated load current or branch circuit selection current, whichever is greater. - 115% Class 2 and class 3 cables listed as suitable for general purpose use with the exception of risers, ducts, plenums, and other spaces used for environmental air, shall be Type ______ - CL2 and CL3 Branch circuit conductors within _____of a ballast shall have an insulation temperature rating not lower than 90 degree Cor 194 degree F - 3 inches Communications circuits shall have a minimum grounding conductor of _____AWG - 12 AWG A separation of at least ______shall be maintained between communications wires and cables on buildings and lightning conductors, where practicable - 6 feet When mounting a light fixture supported be EMT over a hot tub protected by GFCI must have a height of - Not Allowed in NYC How many # 10 conductors can be legally installed in a 4 inch square box, 2 1/8 deep? - 12