A sound level meter is placed in front of a loudspeaker of a 60W audio system reads 70dB. All else being equal, when placed in front of a 120W system, the meter will read ________?
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A sound level meter is placed in front of a loudspeaker of a 60W audio system reads 70dB. All else being equal, when placed in front of a 120W system, the meter will read ________?
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- A residential air-conditioning unit is installed in the attic. a. Is a lighting outlet required? __________ b. What Code section applies? __________ c. If a lighting outlet is required, how shall it be controlled? __________ d. What Code section applies? __________ e. Is a receptacle outlet required? __________ f. What Code section applies? __________A Type NM cable carries a branch circuit to the outside of a building, where it terminates in a metal weatherproof junction box. From this box, a short length of EMT is installed upward to another metal weatherproof junction box on which is attached a cluster of outdoor floodlights. The first box is located approximately 24 in. (600 mm) above the ground. To Meet Code, do the metal boxes and metal raceway have to be grounded? Yes _______________ No _______________ NEC _______________.a. The Code requires a minimum of two small-appliance circuits in a kitchen. Is it permitted to connect a receptacle in a dining room to one of the kitchen small-appliance circuits? _______________ What Code section applies to this situation? _______________ b. Are outdoor weatherproof receptacles permitted to be connected to a 20-ampere small-appliance circuit? _______________ c. Receptacles located above the countertops in the kitchen must be supplied by at least _______________ 20-ampere small-appliance circuits.
- List the minimum service drop clearances required by the NEC in the following residential situations. A driveway _____feet? A lawn ____feet? A roof with a slope of 5/12 ____feet? A garage roof with a slope of 3/12 _____feet?When calculating a dwelling lighting load on the "volt-ampere per ft" basis, the receptacle load used for floor lamps, table lamps, and so forth areWhat color are the faceplates in the bathrooms? Refer to the specifications. ________________
- Determine the minimum number of cubic inches required for two 10 AWG conductors passing through a box, four 14 AWG conductors spliced in the box, two 12 AWG conductors terminating to a receptacle, and one 12 AWG equipment bonding jumper from the receptacle to the box.Calculate the voltage drop of a 120/240 volts, three wire underground residential service installed with 2 AWG aluminum URD cable if the load is 80 amps and the one way length of the underground service conductor is 100 feet.Where a building or structure is suplkied by more than one service, or a combination of branch circuits, feeders, and services, a permanent plaque or directory must be installed at each sertvice disconnect location denoting all other suplying that building or structure and the area served by each. A. Services B. Feeders C. Branch circuits D. All of the above
- A homeowner wants to add 12 general-purpose receptacle outlets to the electrical drawings before the house is built, what additional load, in volt-amperes will they add to the service load calculation?What's the general lighting and general-use receptacle demand load for a 24-room motel where each unit is 700 sq ft?The recessed fluorescent luminaires installed in the ceiling of the recreation room of this residence are connected with trade size flexible metal conduit. These flexible connections are commonly referred to as fixture whips. Does the flexible metal conduit provide adequate grounding for the luminaires, or must a separate equipment grounding conductor be installed? ________________