Suppose an ungrounded 3-phase distribution system is fitted with a lamp-type ground detecting circuit with 3 lamps. If an accidental ground is displayed continuously, what is the indication on the switchboard of a single grounded conductor?

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Accepted Answer

One lamp would be extremely dim or go out and the others would be extremely bright

Answer

One lamp would be extremely bright and the others would be extremely dim or go out

Answer

All three lamps would be extremely dim or go out

Answer

All three lamps would be extremely bright

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