Module 5 Nccer Level 3 Hvac Study Guide

To prevent the normal motor starting current from affecting the fuse operation, non-time delay fuses can be sized at ____ {Ans: 300%}Which of the following is true with regard to circuit breaker interrupting capacity ratings? {Ans: UL tests now include NEMA ratings}Short circuit protection is also commonly referred to as {Ans: motor branch circuit protection}What sit he maximum number of circuit breakers or sets of fuses that may be used as the service disconnecting means in a main service panel without a main switch {Ans: 6}A feeder circuit with no motor load has a continuous load of 5 amps. and a noncontinuous load of 5 amps. The feeder overcurrent protective device should be sized at ____ {Ans: (11.25) 15}For 480V circuits, the available arc current seldom exceeds ____ percentage {Ans: 60}True or False. Reliability is within the basic scope of Underwriters Laboratories work {Ans: False (Safety is the primary consideration of UL)}True of False. The voltage rating of a fuse can be lower than the circuit voltage but never higher {Ans: False (The voltage rating can be higher but never lower)}What is Amperes Interrupting Capacity (AIC) {Ans: The maximum short circuit