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Bud 01-08-2007 03:12 PM

Need to wire my tablesaw
Hello All
I need a little help please.
I have a woodworking shop detached from my house.
I wired my shop from my main service panel for the house, which is 100 amp service. I have a 50 amp 220 breaker in the main panel that goes to my shop. I have a sub panel in the shop with curcuits for lighting, hand power tools etc.
I recently bought a new unisaw (tablesaw) which is 220 volt, 3 horse single phase. I have a 20 amp dbbl. breaker for 220, but not sure about how to wire the breaker. Heres what I think and tell me if I'm wrong!
I'm using 12-2 with ground to feed the 220 outlet for the saw. To wire the breaker, do I attach the Black to one leg of the Dbbl. breaker and the white to the other leg, and the ground wire to the ground bar?

Thanks for the help in advance, I hate anything I can't see, Electricity should have a form and color:laughing:

Thanks, Bud

Christopher 01-08-2007 04:04 PM



To wire the breaker, do I attach the Black to one leg of the Dbbl. breaker and the white to the other leg, and the ground wire to the ground bar?
Yes. And to be thorough, a ring of red electrical tape should be wrapped on the white wires at point of connection.


terrynistler 01-10-2007 02:57 PM

I would sure love a lot more info on the size house, appliances gas or electric and shop use you have. Sounds to me like you could be getting way undersized in many areas. Have a demand factor calculation done... Your saw alone could draw 17+ amps depending on np of course. Lights/heaters/etc just in shop could ramp it up fast. I had to add separate service to my shop because of demand and my House has 200 amp service. Just by single motor and nameplate you are using almost 25% of your total capacity to the house... Whats the distance between buildings? What is the service entrance and panel feed size?

Just curious

scout 01-16-2007 10:54 PM

response and another question
I was just looking at new table saws and was looking at a 5hp or 3hp 230V saw- in talking with them about wiring - the 3hp requires a 30 amp breaker and thus needs 10guage wire- not the 12 like I have - also the 5hp requires a 40amp breaker and thus I assume needs no.8 wire - so are you sure the one you looked at only needs a 20amp circuit? my question is- I have some no.8 wire- and I was going to pull it for this application but is it ok- if I end up with the 30AMP saw and not the 40? - i.e is it ok if the wire guage is 1 size too big? thanks

Brik 01-17-2007 03:47 PM

Too big of wire is fine. Putting the #8 wire you have on a 30A breaker to support your saw will be just dandy. It will also let you upgrade that Uni to the 5HP with only a breaker change! Now, you NEVER want to do the reverse. (Putting small wire on larger breaker)

Brik 01-17-2007 03:48 PM

Also, check out woodnet. Great woodworking resource and lots of unisaw guys there.

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