Planning for a 160KVA, 144KW, 208V, 3 phase UPS.
From the UPS cut sheets, the maximum input current is 480 amps.
The UPS manual lists the maximum input breaker size as 700 amps, and it calls for (2) sets of 400KCM wire.
Question: Can I feed this UPS with a 600 amp breaker and (2) sets of 300 KCM? Two sets of 300's would have an ampacity of more than 500 amps even if I include derating for 4 current carrying conductors. That seems to satisfy the NEC.
Or do I have to follow the manufacturer's reccomendations even though I'm not using a 700 amp breaker?
Steve
From the UPS cut sheets, the maximum input current is 480 amps.
The UPS manual lists the maximum input breaker size as 700 amps, and it calls for (2) sets of 400KCM wire.
Question: Can I feed this UPS with a 600 amp breaker and (2) sets of 300 KCM? Two sets of 300's would have an ampacity of more than 500 amps even if I include derating for 4 current carrying conductors. That seems to satisfy the NEC.
Or do I have to follow the manufacturer's reccomendations even though I'm not using a 700 amp breaker?
Steve