As soon as I get a weather break I am going to run the electrical. (metal shop building). I am trying to save as much as I can so here is the plan. A board mount for the utility that will have a 100 amp meter . Triplex 2-2-2 (direct burial) to the shop (125'), then into the shop panel. Does this sound ok? Do I need a disconnect at the shop or just penetrate the wall into the panel. Is 100 amp enough or should I do bigger?
New service for shop - Code question
- Thread starter tycham
- Start date
mike93lx
ALLIANCE MEMBER
You need a 4 wire feeder and URD can't go inside a building at all. #2 is also only good for 90a, which is plenty for nearly all one man shops.
Mobile Home Feeder is a great option for this since it can go inside (in conduit) and is direct burial.
What is your location?
Mobile Home Feeder is a great option for this since it can go inside (in conduit) and is direct burial.
What is your location?
pattenp
Well-known member
If this is a service feed from meter to a main service panel then 3 wire is okay and #2Al is good for 100A. 4 wire is required for subpanel feeder. Now if there is a breaker disconnect at the meter then the feeder to the shop panel becomes a subpanel feed and a 4 wire feeder is needed. Also the #2Al feed becomes 90A rated. Don't ask why.
I just noticed the link to the metermain you are using, that will need a 4 wire feeder to the shop.
I just noticed the link to the metermain you are using, that will need a 4 wire feeder to the shop.
Last edited:
inphx
Well-known member
BTW https://nassaunationalcable.com/ for me has been a great online mail order vendor for cut to length delivered lower than i can buy locally. I to did the Mobile Home Feeder (MHF) aluminum 2-2-2-4 AL MHF
mike93lx
ALLIANCE MEMBER
Yes, absolutely, I made the assumption that there would be a disconnect at the meter
OK. So do the panel with the breaker, 2-2-2-4 AL MHF to the shop and through the wall (conduit) , into the panel? I am familiar with Nassua and will be getting it there. I just wish they didn't immediately call and email when you visit their site
mike93lx
ALLIANCE MEMBER
Disconnect/panel at the meter with two ground rods, then run to a main breaker panel, another two rods there (or ufer). In the shop panel, the neutral bar has to be isolated from the case and all ground wires
That's what I would do.
pattenp
Well-known member
Are you having this inspected? Technically by the NEC the #2Al is listed as 90A when used as a branch feeder, so the feeding breaker needs to be 90A. The metermain comes with a 100A breaker. Your local inspector may allow 100A breaker on the #2Al.
I have foundation ground tied to the rebar in the shop, so I am all set there. A main panel in the shop. Remove the neutral bonding screw. So the meter panel with disconnect breaker, 2 ground rods, cable to panel in shop. Thanks for all the.
help. Can't wait to get off the generator and extension cord
help. Can't wait to get off the generator and extension cord
It will be inspected (California). If they want I can always change the breaker
wyliesdiesels
Well-known member
Only when feeding a dwelling...
pattenp
Well-known member
Oh.. the technicalities of it all! 