Okay guys, here's my setup. A 75 KVA transformer fed with 480volts is to be set 70 feet away in a separate room from it's provider, a 125amp circuit breaker. I then will leave with 120/208 on 3/0 to provide 200 amps of 3 phase power 60 feet away in a separate room. What am I doing with disconnects? I'm looking around for an answer as I'm a bit confused with secondary/primary needs. where do my disconnect (s) need to be? fused or non fused? If I install a main breaker on my panelboard on the secondary side do I need a disconnect located in the same room as the transformer? Or if I install a fused disconnect on my secondary then I can use a main lug only panelboard? Thanks for any clear concise answers. I have referred to 240.21 in the code but I guess my brain just dosnt function as well as it used to.
tranformer disconnecting setup
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