Electrical service to garage

[cwbroyle]

Hello, I have a electrical question if someone can help. I have a new construction 40 x 80 building I want to run service from my home to it. I do not want it to have a separate meter because of monthly charge. It is about 150 feet from home. My home has a 400amp service with 2 separate 200 amp boxes. One box is full which runs the home. The other 200amp box has a 100amp breaker and a four 15 amp breakers running some basement lights.The 100amp breaker goes to outside sub panel that runs a hot tub and swimming pool pump. I want to run my 200amp breaker box in building off of this if possible. If a 200amp service is not possible what is the largest service I could run off of it. I have a tig welder and 5 hp dual stage compressor as well as radiant floor system heat out there. I know I don't need 200 amps but you never know what you will add in the future and I only want to do it once. Thanks

 

[Bert_]

Hello, I have a electrical question if someone can help. I have a new construction 40 x 80 building I want to run service from my home to it. I do not want it to have a separate meter because of monthly charge. It is about 150 feet from home. My home has a 400amp service with 2 separate 200 amp boxes. One box is full which runs the home. The other 200amp box has a 100amp breaker and a four 15 amp breakers running some basement lights.The 100amp breaker goes to outside sub panel that runs a hot tub and swimming pool pump. I want to run my 200amp breaker box in building off of this if possible. If a 200amp service is not possible what is the largest service I could run off of it. I have a tig welder and 5 hp dual stage compressor as well as radiant floor system heat out there. I know I don't need 200 amps but you never know what you will add in the future and I only want to do it once. Thanks

125A is usually the largest stab in breaker for most panels. Could be other options but I have no idea what kind of panel you have. Why don't you post a couple of pictures so we can see what you're working with.

 

[Kaizen]

I’m doing 125 and have been told it’s overkill. I have a 7.5 hp compressor and with other items being used I was coming close to 100 amps at startup so I just bumped it up to 125


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[ard]

In addition to the questions above, make a quick list of the loads in the new shop. (like is that radiant floor electirc? gas? Boiler??)

125A should be plenty AND can be fed off the 200A that currently serves a pool, hottub and a few garage circuits.

 

[wyliesdiesels]

doub you will even need 100a.

list your loads as said above.

also, one man shop, two man shop, or full scale production?

 

[dcg9381]

I have a similar setup. 320A service that goes to 2 x 200A main panels. House is not built yet, but it will likely be served by 2 x 125A breakers on a single panel. Shop is the other panel.

Shop has a 90A feed.

In my case, I don't have a pool pump (2hp?) but I do have a lot tub. 90A gets it done (for the shop) with 2 2-ton AC systems, refrigerator, washer/dryer, 50A RV connection, and all the normal shop things.

My concern would be the start up of your compressor (look at that) - and how your radiant heating system heats? Look at the amp draw on that (if it's electric) - surely it's gas or geo-thermal?

There were some things that I moved to propane for - like hot water heat and converted a dryer to use propane so I wouldn't draw current on those things.

Cost wise, different wire moving from 90A to 125A for sure... That may or may not be a factor.