1 A 208 volt single phase motor can operate on a 120208 volt

1. A 208 volt, single phase motor can operate on a 120/208 volt, 3 phase, 4 wire system. (True or False)

2. A #4/0 copper conductor in 43⁰ C ambient atmosphere has an ampacity of 189 amperes. (True or False)

3. A load of 300 amperes lasting at least 3 hours will probably not melt the insulation of a #3 copper conductor. (True or False)

4. What conductor is connected between the neutral bar and the grounding electrode?

5. Under what conditions is the neutral conductor in a 120/208 volt or 277/480 volt system considered a current carrying conductor?

* For true or false questions, it is better to write one or two simple sentences to tell me why are they true or false. Thank you so much for answering.

Solution

1.Ans) True

Reason: The line voltage of 3 phase system is 208 V as given ,you can connect your 208 V single phase motor to line-line of 3 phase supply .The motor works fine in this condition as line to line volatage acts as single phase supply to motor

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