VERY SIMPLE and cheap......480 Volt. Use 6 240 volt light bulbs. 2 each in
series off each leg. Simple as that. That is what we have on our 480 volt
MCC"s. When you have a ground, 1 pair of lights will go dark and the other 4
will brighten up. It is then important to go looking for the ground fault
cause if you get another on a different leg you will have a phase to phase
I wouldnt do this if I were you. The problem is that when one lamp
burns out, then the socket of the other can have higher voltages to
ground for the fumbling lamp changer to experience. This Im not sure
you can buy a lamp socket smaller than mogul rated for 480V can you?
You need to use the transformered pilot lights wired in wye so that
the lamp voltage is 120V.
Square D make such a unit for about $100 to $150 if I remember
correctly. Cheap and fast.
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