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Tool Talk Discussion Forum

220V Wiring

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chvet73

12-16-2005 09:10:22

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I want to convert my table saw to 220V from 110V. So I have 2 questions. 1. What amp breaker is needed?
2. What gauge wire?
It appears that from what the manufaturer says 12ga would be OK. The outlets and plugs for this type of setup are not made to handle 10ga wire, unless you go up to 30 amp dryer wiring.
So what do you guys think.

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DJM75

12-19-2005 04:56:07

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

12ga would be plenty remember double the voltage cut the amperage in half. good luck

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Charles (in GA)

12-18-2005 07:08:44

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

You can only convert the motor to 120V from 240V if the motor is internally convertable. The data plate will show what the motor is rated for. If it says 120/240 then it will also give you the amp draw at 120V and at 240V. Do not exceed 80% of the breaker's capacity (ie. 20 amp breaker, don't exceed 16 amps max continous running).

Once you change the plug, you will have to open the motors end plate cover and change the jumpers as indicated by a drawing on the data plate. Do it wrong and you have lots of smoke. If the motor doesn't give you 120V info on the data plate then you cannot convert it.

As someone said, buy a copy of Uglys elect pocket guide. There is also a flip chart style guide called Code check that is good. They will give you distance/amps/volts/wire size/wire type/wire temp rating combinations that are OK and not OK. I have used these two and a couple of others to do all kinds of electrical work. I have a good basic knowledge but they provide the details of conduit and box fill, wire sizes for given distances, etc. and are very necessary to doing a good job of wiring.

Charles

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Slowpoke

12-18-2005 00:50:53

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

Remember that the cable or cord for 110v (now 120v) is rated at 250 volts. The cable or cord for 220v (now 240V) is rated at 600 volts. Be sure to use the correct rated cable or cord for the voltage you will use. It should be printed on the jacket.

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MarkB_MI

12-16-2005 15:23:06

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

1. Don't convert your saw from 220 to 110. You will be much happier if you spend the time and money to run a dedicated 240V circuit to wherever your saw is. If you're doing it for portability it might make sense to convert the saw, but you won't like the results.

2. OK, if you choose to ignore my advice, you will need a 20 amp 120V outlet. Note that the circuits on older houses are usually 15 amp, which means running a new circuit. (Which means you're back at step one.) I'm not sure what you mean about "outlets and plugs...not made to handle 10ga wire", because most 20 amp outlets that I've seen will handle 10 gauge wire. You can also add terminal lugs to the outlets to take heavier wire. At any rate, you shouldn't need more than 12 gauge for the cord to the saw, and 12 gauge should suffice for the house wiring unless the distance to the breaker panel is over 50 feet or so. If it's a long run, go up to 10 gauge wire for the outlet.

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Slowpoke

12-16-2005 15:49:18

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Re: 220V Wiring in reply to MarkB_MI, 12-16-2005 15:23:06

He said he wants to convert to 220v from 110.

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MarkB_MI

12-16-2005 18:00:13

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Re: 220V Wiring in reply to Slowpoke, 12-16-2005 15:49:18

Mea culpa.

Well going from 110 to 220 is easy. The current will be half as much, so if it works on 120 with 12 gauge wire, it will work even better with 12 gauge at 240.

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What Mark Say's

12-17-2005 07:20:41

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Re: 220V Wiring in reply to MarkB_MI, 12-16-2005 18:00:13

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jerrycpp

12-16-2005 12:33:20

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

Get of copy of UGLYS electrical pocket guide. It'll be the best $10 you ever spent. It will tell you what gauge wire for what amperage and distance, and hundreds of other things you never knew you needed to know.

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ed1

12-16-2005 10:35:25

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

It's impossible to give you exact advice on this with out knowing the amount of current your table saw is drawing and how long the run of cable is from the braker to the saw.

Generally though doubling the voltage will require half the current (amps).

volts * amps = watts (with watts being the constant)

My advice would be to ask a licensed electrion to help you with this. For someone who has done this before it's easy but could be a little confusing for a first timer.

Be Careful as you can also do some real dammage - burn up the motot or burn down your shop if not done right. My biggest concern is electrocution

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Red Dave

12-16-2005 09:22:38

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:10:22

1. Look at the nameplate on the motor. See what the ampere draw is when configured for 220 volts.
2. How long will the wiring run be?

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chvet73

12-16-2005 09:51:17

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Re: 220V Wiring in reply to Red Dave, 12-16-2005 09:22:38

I'll check the amperage tonight, when I get home.
The run is about 40' from the panel.

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chvet73

12-17-2005 10:57:25

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Re: 220V Wiring in reply to chvet73, 12-16-2005 09:51:17

Draws 9.5 amps on 220V

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Red Dave

12-18-2005 07:04:38

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Re: 220V Wiring in reply to chvet73, 12-17-2005 10:57:25

I think you will be OK with #12 wire and a 20 amp breaker. For your safety, be sure to wire it according to Code.

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