Power to new shop, what do I need?

[70pcuda]

I'm building a new shop and am trying to decide what kind of power I need. I know I will have:

30 amp RV outlet (the wife like to turn the A/C on when packing up to go camping)
Air compressor says I need a 40 amp breaker
Rotary two post lift says 25 amp
currently using a 120 volt mig, but will probably upgrade to a 220 in the future.
Plus, fridge, lights (enough for 3500 sq ft), heat, outlets, and normal garage stuff.

Will 100 Amp service in the shop be adequate?

I currentl have a 200 amp service at my house. My plan is to put a 100 amp service disconnect outside the house next to the meter and get the power straight from the meter. I laid a 3" conduit out to the shop (around 200 foot) from the house.
I was thinking about a 100 amp panel in the shop to distribute power from there.

Does this sound like the correct way to do this? What wire can I use to support 100 amps at 200 feet? Any suggestions for the model of service disconnect or panel in the shop?

Thanks for the help.

 

[mrb]

looks like you will need 2/0 aluminum, plus the appropriately sized ground. Show a pic of your meter and existing service on the house.

 

[Aceman]

You need to do a load calc on your home first. It doesn't make sense to pull power from your house panel if it can't support both a home and shop.

Then determine what kind of heating system your shop will use and how much it will draw. From that point you'll be able to determine how much power to run to your shop.

 

[70pcuda]

looks like you will need 2/0 aluminum, plus the appropriately sized ground. Show a pic of your meter and existing service on the house.

Here's the meter.

 

[Torque1st]

Can you double tap a meter in Ohio?

 

[MN BIANCHI]

I am currently building a new shop ajacent to our current shop. I plan on pulling 2 200 amp circuits directly from the existing meters. The reason for 2 circuits is we will have an electric boiler for the floor heat that is on an interruptable meter. The electrican said we may have to upgrade the meter sockets, but that would still be cheaper than running 2 new circuits with 2 new meters. The utility has a monthly meter charge that will quickly cover any additonal costs of upgrading the meter sockets.

 

[70pcuda]

I guess you can double tap the meter. The electrician I talked to is the one that suggested this method.

 

[jktruck150]

I know in TN you CANNOT double up on the meter (i.e. running the wires in parallell). I tried to get them to do this. I am having to run it out of the back of my house. If someone can correct me, I should would love it!!!

 

[70pcuda]

I guess I'll have to find out. I could always go through the wall and add a breaker in the house panel. I guess I better figure out how to do the load calculation first.

 

[70pcuda]

You need to do a load calc on your home first. It doesn't make sense to pull power from your house panel if it can't support both a home and shop.

Then determine what kind of heating system your shop will use and how much it will draw. From that point you'll be able to determine how much power to run to your shop.

I went around my house and wrote down the volts and amps (or watts) for all the stuff in my house. Can you tell me how to do the load calculation? Some appliances listed amps and others listed watts or Kilowatts. How do I convert one or the other to get them all on the same page?

The heat in my shop will most probably be a natural gas boiler.

Thanks

 

[Nostraquedeo]

It will be easiest if you figure wattage.

1. If an item has the wattage, then your good. Write it down and move on.

2. If an item only shows amps, then multiply it by the required voltage to get watts.

3. Add up total wattage and divide it my the available voltage. Most likely 220volts.

4. You're going to need to assume something for lighting. Typically 32 watts for a 4' T8 lamp.

5. Then you're going to have to make some assumptions for general outlets. I generally assume that I can onlly be using two maybe three tools at the same time. Figure 1500 watts per tool. There are a lot of variables here, such as NEC requiring that you calculate 180 watts per outlet, diveristy, etc.

I have a 200 amp service to my 3000 sqft home. I have a 100amp breaker from the house feeding my main garage(compressor, welder, table saw, gas furnace, etc), and then I have a 50 amp breaker from that feeding my second garage (Hand tools, heater, window AC, etc.) and never have a problem.