Adding disconnect for new Garage

[bruce_taylor]

I just completed a new 34x60x18 metal building, looking to add power, Have a 150 amp disconnect at the meter, would like to add 100 amp to shop, not really high consumption, one/two man shop, normal stuff, lights, saw, dust collector etc. Probably 100 amp is way more than needed, about 70 feet, thinking aluminum service wire, going to add grounding rods at the building, Open to any insight you may provide, my main questions are the best/easiest way to split out from the 150amp, can I add another 100amp disconnect right beside it and and lugs, not really sure, but this group seems to have a vast knowledge base, so I asking and appreciate any help

 

[theoldwizard1]

This picture sums it up !

View media item 33304
Read note about sub-panel !

Have a 150 amp disconnect at the meter

Not sure what that means. Picture required.

2-2-2-4 MHF (aluminum) wire is reasonably priced, but I think it is limited to 90A. It can be direct buried, but it does require conduit inside buildings.

 

[Bert_]

If it's just a single breaker or disconnect I would try to tap it. No additional breakers at the meter. Yes you can run 100 amp wire off a 150 breaker as long as you protect it with 100 when it enters the building.

Post up some pictures. You will get better advice.

 

[wyliesdiesels]

I doubt the meter is dual lug so an outside tap would be your only option. as to wire needed, i would go with #2 al MFF and protect at 90a in the shop subpanel.

 

[bruce_taylor]

Thank you, I have decided to run 2/0-2/0-2/0-1 al ser, If I need to up grade the service at a later date I should be covered, thanks for the help

 

[Bert_]

Thank you, I have decided to run 2/0-2/0-2/0-1 al ser, If I need to up grade the service at a later date I should be covered, thanks for the help

SER doesn't go underground or overhead, just so you know...

 

[wyliesdiesels]

Thank you, I have decided to run 2/0-2/0-2/0-1 al ser, If I need to up grade the service at a later date I should be covered, thanks for the help

hard stop!

That wire is not rated or permitted for underground use. hopefully you didnt buy it yet

 

[dcg9381]

That's a great diagram. But it's based on 2005 NEC. What's changed?

 

[bruce_taylor]

it's run in 2" conduit not underground

 

[Bert_]

Ser doesn't go underground. Conduit does not change that. If the conduit never goes underground then it's ok but just harder to work with.

 

[pattenp]

If you are thinking underground is direct bury only then that is wrong. As said SER is not allowed to be placed in conduit that is buried. Please clarify exactly how you plan to run the wire the 70' to the metal building.

 

[wyliesdiesels]

That's a great diagram. But it's based on 2005 NEC. What's changed?

nothing has changed. 4-wire feeder with isolated neutral bar is still required for subpanels no matter where the subpanel is located (attached or detached)

it's run in 2" conduit not underground

is the conduit underground?