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Tool Talk Discussion Forum

Drawing an Arc

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FarmerDave

10-21-2004 16:37:05




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I'm reworking the lectric service to my shop. How many amps draw should I plan on for a small farm?




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FarmerDave

10-22-2004 07:00:08




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 Re: Drawing an Arc in reply to FarmerDave, 10-21-2004 16:37:05  
You think I'm gonna use it for a long time, LOL. It was built in the 20's. But it's not a very well built building. The long term plan calls for another new building. Without question the new building will get 200 A +.

My old building already has #2 AL in the service drop and 100 A main disconnect. This old farm needs money just about everywhere you look. My brother, shareholder, claims it's a workhorse money pit.

So allocating money for maintenance or capital improvements is always a struggle. When fertilizer might pay off next year, it beats electrical that might never be needed.

So it's looking like I just need a main lugs panel to replace my old 4 fuse box. I suspect I could get a 100, 125 or 200A main lugs panel. A twenty slot 200 A probably won't cost much more than a 100 A model. But then again, they might not stock it at the nearby big box. The electrical supply house never takes pity on a farmer.

One only has two hands too. So I can't weld and run some other high power tool at the same time.

Would a 100 A carry most welders, an attic fan and lights for a 24' by 30' garage?

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jhill

10-22-2004 12:52:56




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 Re: Drawing an Arc in reply to FarmerDave, 10-22-2004 07:00:08  
I have 100 amp service in my shop and run the 7 hp 220v compressor, 300 amp welder and all the lights at same time without problem. I think 100 amp would work for you too then put 200 amp in new building.



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Short Round

10-22-2004 05:22:14




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 Re: Drawing an Arc in reply to FarmerDave, 10-21-2004 16:37:05  
Dave go with the 200 amp and dont look back, I have been in the electrial trade for over 25 years and have a lot of people say "wish I would have went bigger when I built it" The few extra dollars it will cost now will be long forgotten in a year, and them you will have a service you can do something with. Good luck.



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NC Wayne

10-21-2004 21:04:00




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 Re: Drawing an Arc in reply to FarmerDave, 10-21-2004 16:37:05  
Hey Dave, if your having to have a service pulled in it's always better to have too much than to find out later you don't have enough. Dad and I both have 200 Amp service pulled in at our shops. I don't have alot of high draw tools in mine yet but we have the works at Dads where we sometimes do jobs related to our equipment repair business. The shop equipment include a 20hp capacity phase converter that is used to run a 3phase 7.5hp compressor motor, a 3ph 5hp lathe motor, and assorted other smaller 3ph motors. We also have a Miller Maxtron 450 welder that is set up on single phase and is capable of doing 350 amps at 100% duty cycle. We often have the compressor, the lathe, and the welder (MIG welding at 300 amps for 30 minutes at a time plus on a buildup machine) all going at the same time, along with assorted other small loads such as a ceiling fan, lights, etc. So far we've never exceeded the potential in the 200 amp service. Like I said better too much than not enough. Around here there isn't all that much difference in price for a 100amp vs a 200amp, so if the same holds true in your area, then go for the largest service you can get for a reasonable price.

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Ray,IN

10-21-2004 20:57:24




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 Re: Drawing an Arc in reply to FarmerDave, 10-21-2004 16:37:05  
That's easy. Just list all the equipment you have, and plan to have, plus the listed starting amperage. Add a fudge factor of 15% of the total and you should be safe. There are several electrical calculaters on the net that will assist you.



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Big Jim

10-22-2004 03:27:34




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 Re: Drawing an Arc in reply to Ray,IN, 10-21-2004 20:57:24  
and, if you expect to be in the shop for a long time, double the number so you can handle all the other stuff you will eventually get.
Unless you have a number of high current machines, the easiest choice is 200 amps. That is the standard in the housing industry so 200 amp panels are usually cheaper than anything else.
I recently put a 100 amp service in a 16x20 wood shop and used a 200 panel kit because it was a lot less expensive than the 100 amp one.

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