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- Dec 8, 2013
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Thanks for all your input. I'd still be scratching my head.
Since it's 220v in would it be a dual 40 breaker or a dual 20?
Two pole 40 amp.
Thanks for all your input. I'd still be scratching my head.
Since it's 220v in would it be a dual 40 breaker or a dual 20?
Two pole 40 amp.
You might want to consider connecting it for the full load it's capable of running. It will cost less to do it once then to re-do it later when you add machines.
I noticed that item D on the schematic wasn't grounded; I think this was an oversight because everything metal needs to be grounded including the machines. A few comments: although the schematic specifies a magnetic starter at location D I wired the RPC output directly to the 240V winding of the tranny & installed a [600V, 30A, fused] safety disconnect after the transformer on the wall next to it [plus the lathe came with an unfused safety disconnect already installed [important since it's about 12 ft from the fused disconnect on the wall by the RPC]. Also, although the RPC can handle about 72 amps in I need less than 10 amps out [240V, 3-ph] so I fed mine from a 2-pole, 40A breaker, #8 wire, a NEMA size 2 motor starter [item A] with overload heaters rated for about 30A to handle the starting inrush current. I also used #10 wire between the 3-ph RPC output & the transformer although 12 or even 14 gage wire would work. For the 480V, 3-ph wiring to the lathe I ran #12 wire through 1/2 inch thin wall conduit [also called EMT]. Finally, I put 3-5A fuses in the 480V safety disconnect by the tranny & RPC.