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A series of multiple-choice questions and answers related to the national electrical code (nec) for journeyman electricians. It covers various topics, including grounding, conductor sizing, overcurrent protection, and installation practices. The questions are designed to test knowledge of electrical safety, code requirements, and practical applications in the field.
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Where the outer sheath of Type MI cable is made of steel _____________. A. it shall provide an adequate path to serve as an equipment grounding conductor B. a separate equipment grounding conductor shall be provided C. the grounding and grounded conductors shall be connected together D. it shall not be longer than 6 feet correct answersB. a separate equipment grounding conductor shall be provided The interior of enclosures or raceways installed underground shall be considered to be a _________ location. A. wet B. damp C. moist D. dry correct answersA. wet The continuity of the equipment grounding conductor system used to reduce electrical shock hazards for portable electrical carnival equipment shall be verified ______________. A. and recorded on an annual basis
B. and recorded on a quarterly basis C. and recorded on a monthly basis D. each time the equipment is connected correct answersD. each time the equipment is connected A plate-type grounding electrode shall be installed below the surface of the earth NOT less than ________. A. 24 inches B. 30 inches C. 36 inches D. 48 inches correct answersB. 30 inches Determines the MAXIMUM allowable ampacity of a size 1/0 AWG THW copper current-carrying conductors of the same size. Ambient temperature is 86*F. A. 150 amperes B. 105 amperes C. 112 amperes D. 120 amperes correct answersD. 120 amperes
C. 80 amperes D. 85 amperes correct answersC. 80 amperes A 208-volt, 3-phase, 50 hp, squirrel-cage, continuous-duty, Design C, AC motor has a full-load running current of _________. A. 130 amperes B. 143 amperes C. 162 amperes D. 195 amperes correct answersB. 143 amperes Luminaires installed under metal-corrugated sheet roofing decking shall be installed and supported so there is NOT less than ________ clearance from the roof decking to the top of the luminaires. A. 1 in. B. 1 1/4 in. C. 1 1/2 in. D. 1 3/4 in. correct answersC. 1 1/2 in. Determine the MINIMUM trade size electrical metallic tubing (EMT) required to enclose eight (8) size 6 AWG copper conductors with THHW insulation, where installed in a 60-foot conduit run.
A. 1 inch B. 1 1/4 inches C. 1 1/2 inches D. 2 inches correct answersB. 1 1/4 inches In general, when feeder conductors of not over 600 volts supply a continuous- load of 240 amperes, the overcorrect protection device protecting this circuit shall have a MINIMUM rating of ____________. A. 240 amperes B. 300 amperes C. 250 amperes D. 275 amperes correct answersB. 300 amperes Where exceptions are not to be applied, liquid tight flexible metal conduit (LFMC) shall be securely fastened within at LEAST ________ of each box or other conduit termination. A. 4 1/2 feet B. 3 feet C. 12 inches D. 18 inches correct answersC. 12 inches
B. three C. four D. five correct answersC. four For the purpose of calculating the general lighting load for a dwelling unit, the floor area should include all the following EXCEPT________. A. kitchens B. bathrooms C. an unfinished basement intended for future living space D. an open porch not adaptable for future use correct answersD. an open porch not adaptable for future use Electrical equipment such as distribution panel boards, motor controllers, and motor control centers that are located in other than dwelling units, and are likely to require examination, adjustment, servicing, or maintenance while energized, shall be field or factory marked to warn qualified persons of __________. A. potential arc flash hazards B. arcing parts C. shock hazard warning D. conductor ampacity corrections correct answersA. potential arc flash hazards
Which of the following listed types of batteries is NOT permitted for use as a source of power for emergency systems? A. automotive B. lead acid type C. alkali type D. all of these correct answersA. automotive The MINIMUM rating for a service disconnecting means for a building, other than a one-family dwelling, consisting of three, two-wire circuits shall be _____. A. 15 amperes B. 30 amperes C. 60 amperes D. 100 amperes correct answersC. 60 amperes In guest rooms or guest suites of hotels and motels, and sleeping rooms in dormitories, at LEAST _____________ general purpose receptacle(s) installed in the room is/are required to be readily accessible. A. one B. two
D. IV correct answersC. III Receptacles supplying power to freestanding-type office furnishings shall be located NOT more than _______ from the furnishing that is connected to it. A. 6 feet B. 3 feet C. 1 foot D. 8 feet correct answersC. 1 foot