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A series of questions and answers related to the national electrical code (nec) and electrical wiring practices. It covers topics such as utilization equipment, concealed wiring, damp locations, ohm's law, electrical power, continuity testing, emt bending, motor current calculations, ground fault circuit interrupters, box enclosures, conductor lengths, service conductor height, voltage drop, circuit breaker ratings, conductor ampacity, fuse types, electrical range ratings, conductor temperature ratings, and lighting circuit calculations. A valuable resource for individuals studying electrical wiring and nec regulations.
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What should the following list does the NEC define as utilization equipment? - answer Water Heater The nec defines concealed as being what? - answer Made inaccessible by the structure of the building Electrical wiring installed under canopies or roofed open porches is considered to be installed in what kind of location - answer Damp Ohm's law is the relationship between - answer Voltage, current, and resistance. What is the unit of electrical power - answer Watt When checking for continuity between a circuit breaker and the neautral bar of a panel board when using a continuity tester, positive continuity is indicated. The reason why may be what? - answer A conductor grounded or a luminaria or an appliance may be turned on When installing EMT there shall be no more tha how many 90 degree bends between boxes/or pull points? - answer Four The full load running current of a 1/2 hp, 120v, single phase, ac motor used a garage door opener is how many amps? - answer 9.8 Amperes The NEC Mandate specific branch circuits, receptacle outlets and utilization equipment should be provided with a ground fault circuit
interruptor; this device is intended for what? - answer For the protection of personnel Unusual openings in metal boxes, cabinets, and other such enclosures shall be what? - answer Effectively closed What is the minimum length of free conductor required to be left at each device box or lighting outlet box for the purpose of splicing conductors, or making connections to luminaries or devices? - answer 6 inches The point of attachment of the overhead service conductors to a dwelling unit shall be no less than how many feet above finished grade? - answer 10 feet If the voltage-drop of a branch-circuit is too great, which of the following, if any, may be the result? I) unsatisfactory illumination of lighting fixtures II) overheating of a motor or unsatisfactory motor speed - answer Both I and II Which of the following listed circuit breakers is NOT a standard ampere rating - answer 75 Table 240.6(A) NEC A 4 in. X 1 1/2 in. metal octagon box may contain maximum of how many 14 awg conductors - answer 7 For a one-family dwelling, the service disconnecting means shall have a rating for not less than how many amps? - answer 100 As a general NEC rule, when a 20A branch circuit serves a single receptacle outlet, the rating of the receptacle must not be less than - answer 20 amps