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A 4 hp 230 V single phase motor has a service factor of 1.15 and name plate current rating of 25 A. What size dual element fuse can be used to protect the motor from overloads, short circuit and ground faults?
How many types of 5 wire feeders shall be permitted to utilize a common neutral?
An electrical circuit feeding two single phase motors with a full load current rating of 50 amperes, 30 amperes respectively. Which of the following is the required dual element time-delay fuse size?
The rating of feeder tap over current terminating device is 40 Amperes. Which of the following ampacity feeder tap can be used if the conductor length is less than 10 feet.?
The cross sectional area of the conductors permitted in a seal shall not exceed _______ percent of the cross sectional area of a rigid metal conduit of the same trade size.
Which of the following circuits shall not be connected to system containing trolley wires?
Circuits for lightening
Rotating electrical machinery placed in Class II, Division 1 location shall be _______
Totally enclosed pipe ventilated
The disconnect switch Rating for motor loads is kept higher than motor conductor to permit the motor to start.
Where a fuse used as single phase motor overload protection, it shall be inserted in each _______ conductor.
There shall be at least _______ mm airspace between wall and the door of any cabinet containing current carrying conductors whose operating voltage is less then 250 volts.
How many types of 4 wire feeders shall be permitted to utilize a common neutral?