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3 Phase Circuit Sizing

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Forum topic by Hyperhutch posted 07-05-2009 03:46 PM 721 views 0 times favorited 1 reply Add to Favorites Watch
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Hyperhutch

63 posts in 2711 days


07-05-2009 03:46 PM

So, I am in the process of setting up shop. I have the tools, 3 of which are 3 phase, and now I have to power them. I have the wiring figured out like this: 1 phase sub-box powering 10hp RPC, to 3 phase breaker box, to Turn-Lock plugs to motor starters to on/off switches.

Now, the question is what equation should I use to know how to size the 3 phase circuits. Right now I am planning on one circuit per machine. The machines are:

5 HP 14” Rockwell RAS
3 HP Rockwell Unisaw
1/2 HP Rockwell 8” Jointer (will upgrade to 1 or 1.5 HP in the future)
3 HP 1100 RPM motor for the Big Lathe (This is a future improvement that will hopefully happen in the next couple years.)

Right now I can get good deals on 20A and 30A 3 phase breakers. Which should go where and why?

Thanks!

Hutch

-- I hope the volume of shavings one creates is directly related to the probablility of one's success, cuz if so I've got it made!!


1 reply so far

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Hyperhutch

63 posts in 2711 days


#1 posted 07-06-2009 12:10 AM

Actually, never mind. I have gotten some good information on the subject and I think I got everything worked out.

-- I hope the volume of shavings one creates is directly related to the probablility of one's success, cuz if so I've got it made!!

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