Hey everyone,I'm working on a home where i'm going to install A 800 amp service. It's a 120/240 single phase set up.Underground lateral.I have 2-150 amp main lug panels that are remote and I have 2-200 amp panels that are outside at service location.I've done a few 400amp services (2-200amp 8/16 main breaker feedthru's, meter ect.)And some larger sevices requiring the use of some mdp's. I've never done a 800 amp though,so my question was reguarding the service disconnect(s).Rather than using a mdp, what other ways could I set this up,like 800 amp disconnect-Fused or not?.Or can I set up like a 400amp with 4 -200 amp main breaker panels-parralled to the ct? I have plenty of room to work with.Any info appreciated.Thanks
800 amp service
- Thread starter blue302
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hardworkingstiff
Senior Member
- Location
- Wilmington, NC
There is nothing wrong with installing four MB panels in the same location each with their own feeder to the CT cabinet. This is how I would do it unless you had a load too large to be fed from one 200-amp panel.
I am curious though, what is the calculated load of this house. 800-amps for a home is pretty large.
I am curious though, what is the calculated load of this house. 800-amps for a home is pretty large.
I am in the process of upgrading a home's service from 320A to 800A single phase 120/240V as well. The existing home is 7800 sq.ft. and there is a 13,500 sq.ft. addition underway. The PoCo is installing CTs at the pad mount tranny and I am installing a 800A ML panelboard in the basement of the new addition with 4 200A CBs in it. (2) will feed the existing (2) 200A disconnects located on the outside of the existing part of the home and the other (2) will feed (2) 200A panels in the addition. The calculated load on the original house was 310A and the new calc load including the addition is 628A. I'm pretty sure I've got it covered as there is no more room on the lot to ever add on to this house again!
800 amp
800 amp
some of the guys who run the $$$ numbers might have better insight than I do, but in practice, unless you have one significant load, I see more of the
"4-200's run to a ct cabinet" than I do MDPs.
don't forget to "group" your disconnects and remember, before installing "off the shelf" loadcenters, with the 800 amp service, available fault current may be an issue. Those are the two items I see overlooked most often in these installations.
800 amp
some of the guys who run the $$$ numbers might have better insight than I do, but in practice, unless you have one significant load, I see more of the
"4-200's run to a ct cabinet" than I do MDPs.
don't forget to "group" your disconnects and remember, before installing "off the shelf" loadcenters, with the 800 amp service, available fault current may be an issue. Those are the two items I see overlooked most often in these installations.
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
Just for grins and giggles, what KVA transformer is the PoCo installing? Is it dedicated (I would assume it was) to just this house? My bet is you will get a 50 KVA, I will be surprised if it is a 100 KVA.
Thanks for the advice guys,The load is at about 550amps,got some additional work to do on an addition ,adding some appl's, landscape lights,that will add to 550, we went with 800 for room to grow as well.I'm not sure what the poco speced out as far as tranformer goes .I will be sure to let you know.I'm going to go with the four 200 amp panel setup.But Im not sure about the nuetrals do they all run from the panels to the ct or nuetral tap bar in gutter?how do you guys set it up?Once again Thanks B.T.W augie47 what do you mean by "available Fault current may be a issue"
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