Home Improvement Asked by grantr on December 23, 2020
I am having a new shop built on Friday.The shop is located 250 feet from my power meter.
For a 240 volt 100 amp service in the shop, the online calculator says I need 2/0 AWG Aluminum or 1AWG copper.
I have underground service to my home and the wires leading form the meter run under the slab to the 200 amp panel in the bedroom closet. Running a wire from the panel in the house to the shop will not work as I cannot get the wires into the house.
The meter also has separate wires running to a 100 amp service panel in the add on washroom. There is a separate conduit running to the meter box that feeds this portion of the house. The wires feeding the 100 amp service are too small for what I need at the shop. Plus I have the same issue getting the wires into this panel box as well.
What do I need to do to get the power run to my shop? Is there a way to tie 2/0 AWG into the meter? I am guessing the meter is already crowded since it has wiring for the 200 and 100 amp service running to it. I am guessing there will be no room to run additional wiring to it as is.
My service line to the shop will be under ground. What wire type should I use?
Unfortunately this has quite a number of defects in it already, including a panel in a clothes closet, a panel in a bathroom, and 2 feeders (service laterals, really) to the same structure.
As far as splitting the laterals below the meter, that is just a matter of splicing space, and you will be able to resolve that with an additional box or gutter below or on the opposite side of the pole from the meter.
Normally this type of splitting calls for a main breaker at the meter, and then supply breakers to each lateral feeder that is not rated for the ampacity of the main breaker. (But still, dual feeders to the house would be problematic.) I am concerned Anyway, that is a good argument to up this outbuilding feeder from 2/0 to 4/0, because then you
Anyway, the upshot of all that is that you are already at 2/0. If you spend a bit more to take it to 4/0, then that wire would be legal at 200A.
Answered by Harper - Reinstate Monica on December 23, 2020
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