IEC First Year Exam Study & Practice Questions With Verified Correct Answers | Updated

IEC First Year Exam Study & Practice Questions With Verified Correct Answers | Updated What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads? - ANSWER 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 ___. - ANSWER 240.15(B)(1) 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. - ANSWER 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? - ANSWER 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) ___. - ANSWER is 1.2 kW - ANSWER 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 ___. - ANSWER 24 in. An extension ladder should extend ___ feet above the top of the building and be secured. - ANSWER 3ft.