We were looking at a job the other day that had a compressor wired in an odd way. This may not be an NEC issue since it is part of a manufacturers system, but can anyone tell me what the advantage is? See below:
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480VAC/250 amp compressor. Instead of one size 5 starter, it has two (2) size 4 contactors in parallel connected to one overload block. The compressor is then connected to the load side of the overload block.
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Using list prices, a size 5 starter is approx twice the cost of a size 4, but then you have to figure additional panel space and labor to wire this configuration. Any other ideas on what the advantage may be?
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480VAC/250 amp compressor. Instead of one size 5 starter, it has two (2) size 4 contactors in parallel connected to one overload block. The compressor is then connected to the load side of the overload block.
******************
Using list prices, a size 5 starter is approx twice the cost of a size 4, but then you have to figure additional panel space and labor to wire this configuration. Any other ideas on what the advantage may be?