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Kwright · Jul 27, 2007, 09:45 AM

I'm getting ready to wire up a wood shop and have one quick question about the 220V circuits. I will have four separate (dedicated) circuits - 1 for the table saw, 1 for any additional 220V equipment (planer, jointer, etc), 1 for a dust collector and 1 for an HVAC. My question is, which (if any) circuits can be wired with 10/2 or do I need to wire them all with 10/3?

And as an after thought, do these circuits require GFIs?

TIA
Kerry

tkrussell · Jul 27, 2007, 12:30 PM

Really need to know amps or horsepower for each motor to be sure of the right answer.

Kwright · Jul 27, 2007, 02:18 PM

Originally Posted by Kwright

I'm getting ready to wire up a wood shop and have one quick question about the 220V circuits. I will have four separate (dedicated) circuits - 1 for the table saw, 1 for any additional 220V equipment (planer, jointer, etc), 1 for a dust collector and 1 for an HVAC. My question is, which (if any) circuits can be wired with 10/2 or do I need to wire them all with 10/3?

And as an after thought, do these circuits require GFIs?

TIA
Kerry

All will be 30A circuits. I only have the dust collector in my possession and it is a 5HP motor. Since I haven't bought the other tools yet I can't say for sure what their HP rating will be. The table saw will most likely be 3hp but may be as big as 5hp. The HVAC units I'm looking at pull about 8A but I don't know what the HP rating is.

tkrussell · Jul 28, 2007, 03:47 AM

Sorry I asked a stupid question you already know what size wire, you asked a different question.

10-2 with ground is needed for any 120 volt outlets, or any straight 240 volt outlets. A 10-3 with ground will only be needed for something that uses both 240 volts and 120 volts.

I do not believe any power tool will need both 120 & 240 volts. So should be able to use 10-2 with ground for all the outlets, no matter if 120 or 240 volts is needed.

Did I understand correctly this time?

Kwright · Jul 28, 2007, 05:39 PM

Yes you did, and no problem, clarification is always good. I appreciate your time (and answer), this should save me a few duckets, I can't believe the price of copper now days!

Last question, Will I any of these circuits require a GFI?

Kerry

tkrussell · Jul 28, 2007, 06:21 PM

If this is a shop that hired help will work with,OSHA will require GFI protection. If private, then no GFI required. But if your going to work alone, it may be a good idea to GFI protect what you can. 2 pole GFI breakers cost approx $130.00 each.

Kwright · Jul 29, 2007, 12:43 PM

2 pole GFI breakers cost approx $130.00 each.

OUCH! :eek:

It is a personnel shop, and I do agree with "safety first", but OUCH! I guess I'll do the two circuits meant for tools. The dust collection will be electrically isolated from the tools (ducting will be S&D pipe) and the HVAC will only be worked on if the power is off anyway.

Thank you very much for your help!!

Kerry