Installing a 100 amp sub panel in a detached garage

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John Wayne

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Gaithersburg, Maryland
Hello any help would be appreciated- I am wanting to install a 100 amp sub panel in a detached garage. I would be running about 60' inside the house and then trenching about 80' outside to the garage. I thought I would use 1/0 SER aluminum but wonder if that is the best to use both inside and outside in pipe?Thanks
 
Dennis Alwon said:
To be clear even if the SER is on conduit it cannot be in the ground
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Agreed. I apologize for not being more clear. One thought I had was to run 1/0 SER from main panel thru house to a pvc junction box on the outside of the house and then 2" conduit with three 1/0 's THWN and a #6 THWN ground. Do you think I'm ok with 1/0 140'? I was wondering if there was a a wire that I could run directly from the main panel to the sub panel without any junction boxes.
 
John Wayne said:
Agreed. I apologize for not being more clear. One thought I had was to run 1/0 SER from main panel thru house to a pvc junction box on the outside of the house and then 2" conduit with three 1/0 's THWN and a #6 THWN ground. Do you think I'm ok with 1/0 140'? I was wondering if there was a a wire that I could run directly from the main panel to the sub panel without any junction boxes.
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1/0 would be fine, IMO
 
John Wayne said:
Do you think I'm ok with 1/0 140'?
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Voltage drop is the only thing that would make you go with more then 1 AWG aluminum if the overcurrent protection is 100 amps. Voltage drop will depend on the actual load and not necessarily the fact you have 100 amps overcurrent protection device. You could have only 40 or 60 amps load but a motor that has starting current that for a short time goes well over 100 amps and still gives undesirable voltage drop for that short time.
 
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