Question 308Electricity & Electronics - Assistant Engineer
70% to passWhen using the test set-up shown in figure "A" of the illustration, besides the motor windings and the motor feeder cable, what circuit components are actually being meggered? Illustration EL-0027
Athe power circuit of the starter up to the load side of the overload relay heaters
Bthe power circuit of the starter up to the load side of the main contacts
Cthe power circuit of the starter up to the load side of the disconnect switch
Dthe entire starter, including the power and control circuits, up to the load side of the disconnect switch
AI Explanation
The correct answer is B) the power circuit of the starter up to the load side of the main contacts. When using the test setup shown in figure "A" of the illustration EL-0027, the megger is connected to the motor windings and the motor feeder cable. This means the circuit being meggered includes the power circuit of the starter up to the load side of the main contacts, but not the control circuits or components beyond the main contacts. The other options are incorrect because they either include too much of the circuit (D), or exclude components that should be included (A and C).
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