IEC First Year Exam Study with 100% correct answers 2024 latest update.

What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads? The load of higher resistance would overheat and probably be damaged. The Code reference that specifies the type of disconnecting means (circuit breaker for example) that can be used on a multiwire branch circuit that feeds devices mounted on the same yoke [a stack switch or a duplex receptacle for example] is ___. 240.15(B)(1) Brainpower Read More Previous Play Next Rewind 10 seconds Move forward 10 seconds Unmute 0:00 / 0:15 Full screen Refer to the panel schedule shown in Figure 128.231. If the neutral is removed from the neutral bar, ___ volts will be applied to the TV. 150 A 12/3 cable is installed from a 120/240-V, 1Ø panel and feeds a split-wired duplex receptacle. One "hot" is connected to a 20A breaker in panel space 1. The second "hot" is connected to a 20A breaker in space 3. A 16-amp load is connected to the upper receptacle and a 14-amp load is connected to the lower receptacle. Which of the following will happen if the neutral is removed from the receptacle? Because a higher voltage will be applied, 120-volt equipment could be destroyed. Refer to Figure 129.106. With the equipment energized and the power used by the element connected at T3 & T4 is 0.3kW, the power used by the equipment (all 4 elements) ___. is 1.2 kW A short length of EMT is run between two panels. The ampacity values for the conductors in this EMT need not be derated, as long as the length of the EMT does not exceed ___. 24 in. An extension ladder should extend ___ feet above the top of the building and be secured. 3ft. What is the monthly energy cost to operate a 250-watt high-pressure sodium lamp? Electricity costs $0.15 per kW-hr and the lamp will be ON for 8 hours per day. There are 30 days in a billing month. $9.00 ___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins. Service Point If a 60-watt lamp operates for 21 hours, the utility will bill for ___ kWh. 1.260 To minimize conductor insulation damage and arcing damage to electrical equipment during a ground fault or a short circuit, ___ should be minimized. a. time duration of the fault Article ___ in the NEC ® covers grounding and bonding of electrical systems. 250 Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the equipment grounding conductor to a metal box. are not For a 100-Amp, 120/240-V, 3W commercial service, ___ AWG copper THHN/THWN conductors are the smallest permitted for the ungrounded conductors. 3 Loads, such as heating and air conditioning, that do not operate at the same time are said to be noncoincident loads. While separate circuits must be designed to serve each load, when calculating service load only the ___ of two noncoincident loads needs to be included. larger Which of the following is a 3/0 AWG conductor? 000 When calculating the size of the required service, you should consult household electric clothes dryer demand factors given in Table ___. 220.54 The Standard for Electrical Safety in the Workplace requires that all electrical equipment operating at over ___ volts to ground be de-energized and locked out before anyone is permitted to work on or near the equipment. 50 Without exceptions, all metal parts of an indoor spa or hot tub must be bonded. true Article ___ of the NEC ® is the article that gives requirements for swimming pool installations. 680 What is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC ® requires to be installed near a permanently installed pool? The pool is located in your neighbor's backyard. one While installing Cat 5 cable, pulling too hard can damage the ___. jacket, conductor, insulation When a portable generator provides power for frame-mounted receptacles only, the NEC ® ___ require the frame to be connected to a grounding electrode. does not Transfer switches use a ___ to prevent the feedback of electricity between the generator power and the normal utility power. mechanical interlock It is permitted to run normal power conductors and optional standby power conductors in the same raceway or enclosure. true when installing and audio/video/data cables, the cables run should ___ not be kinked, be secured with rounded or depth stop staples, be bounded loosely with other cables terminations of RG-6 cable are made using __ connectors (jacks) F (connector) only Home automation controllers that utilize radio frequency (RF) ___ can send signals through walls A disconnecting means (or means of disconnect) for a swimming pool circulation pump must be installed ___ at least 5' from the inside of the pool, readily accessible, so that it is visible from the pump When receptacles that provide power for water pump motors or other loads directly related to the circulation and sanitation system are located 6' and 10' from inside walls of the pool, these receptacles are required to meet which of the following conditions? They are of the grounding type, they have GFCI protection what is the minimum number of 125-volt, 15- or 20-ampere convenience receptacles that the NEC requires to be installed near a permanently installed pool locates in you neighbors backyard one a 20-amp, 120-volt duplex convenience receptacle near a pool shall be located so that it is ___ feet or more from the inside edge of the swimming pool 6' Generally, safety switches and wall switches must be located at least ___ from the inside edge of the swimming pool 5' When calculating residential service load, ___ is allowed for each branch circuit serving laundry receptacles 1,500 volt-amperes the minimum size service disconnect for a single-family dwelling with a computed load of kVA is ___ amperes 60 For a 125-amp, 120/240-V, 3W residential service, ____ AWG copper THHN/THWN conductors are the smallest permitted for the underground conductors 2 for purposes of calculating a residential service, the general-purpose lighting load is calculated at ___ per sq. ft. of area 3 volt-amperes plug fuses can be used on which of the following voltage systems? 120/208-volt, 1-ph, 3-wire 120/208-volt, 3ø, 4-wire (anything under 150- volts) the NEC has limitations on where OCPDs, such as panelboard installations, can be installed due to the presence of combustible materials. these are specified at ___ none A breaker panel is permitted to be located ___ in an electrical room in a school in a bathroom in a restaurant the disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in space 8-10 in the 277/480-volt, 3ø, 4-wire panel. Is a code violation Yes Usually, load centers are not available with "bolt-on" circuit breakers true