I'm looking at an application where a 1600A breaker is protecting (3) sets of 400 MCM copper cables which are feeding an enclosuere containing a wye-delta starter. I could not gain access to the starter but am told there is a wye-delta starter in the enclosure. The load the starter is starting is aproximately a 566 kW compressor.
At first glance it does not appear that the (3) sets of 400 MCM cables with a combined ampacity of 1005A are adequately protected by the 1600A breaker. Is there a provision for feeding a wye-delta starter that allows the cable to be rated less than the upstream breaker?
At first glance it does not appear that the (3) sets of 400 MCM cables with a combined ampacity of 1005A are adequately protected by the 1600A breaker. Is there a provision for feeding a wye-delta starter that allows the cable to be rated less than the upstream breaker?