Over Current Protection Theory quiz-1
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Question 1 of 9
1. Question
1 pointsThe ampacity of the feeder tap conductors not less than 10 ft shall not be less than the rating of its terminating device.
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Refer : NEC 249.21[B][1][1]
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Question 2 of 9
2. Question
1 pointsThe ampacity of the feeder tap conductors which leaves the enclosure or vault shall not be less …………………… of the over current protection device rating protecting the feeder tap conductors.
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Refer : NEC 240.21 [B][1][4]
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Question 3 of 9
3. Question
1 pointsThe branch circuit rated circuit breaker is marked for use with No 18 AWG and supplies a continuous load of 5.6 ampere, which of the following over current protection amperage that can be used?
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Refer NEC 240.4 D(1)
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Question 4 of 9
4. Question
1 pointsThe over current device should be connected in parallel with each ungrounded conductor.
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It should be connected in series with each ungrounded conductor so that when the current flow in conductor increases the trip level it trips.
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Question 5 of 9
5. Question
1 pointsNormally over current devices are located in ungrounded conductors at a point where the conductors deliver the energy to the load.
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Refer : NEC 240.21
It is located near supply end. -
Question 6 of 9
6. Question
1 pointsWhich of the following is the maximum voltage that a plug fuses are used as over-current protection devices in electric circuit?
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Question 7 of 9
7. Question
1 pointsWhich of the following is not a standard rating of a fuse or circuit breaker?
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Question 8 of 9
8. Question
1 pointsWhen two different sizes of wire are connected in series, the maximum fuse rating that shall be used is one that protects …………………
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Question 9 of 9
9. Question
1 pointsOver current protection is not required at the point where the wire size is not over 25 feet.
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Refer : NEC 240.21