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Discussion Starter #1
Hello all,
I'm installing a 200A ATS and will need to replace the 4/0 AL SE-U running from the meter pan to load center. I was thinking of using 3/0 CU SE-U because the run is in a tight place with about 4 90 degree turns (roughly 7 - 8 feet in length end to end).

I was thinking that slightly smaller and a bit more flexible copper (albeit ridiculously expensive) would make installing this a bit more of a pleasure.

Running individual conductors would also be tough because of the tight area.

Problem is, no electrical supplier in my area has it or can even order it in.. I could understand why it is not stocked, but is it really that rare to use copper for a short service run?

I'm even having a hard time finding a place to buy it online. If anyone has any sources I can order it from, it would be appreciated. I could wrestle the aluminum in there and will do that if the copper is really that unattainable...

Thanks!
 

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Master Electrician
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1,165 Posts
What the heck project are you doing that there's a 200a ats?
 

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Discussion Starter #3
It's a service entrance rated switch, and I have a 200A service. I believe the generator puts out ~85amps (20KW) and the genset has a 100A breaker.

The setup powers the entire load center, but will load shed if/when needed. The ATS is packaged with the Generator, which is a Cummins Onan.

So with that explained, I need to remove the 4/0 AL SE-U feeding the load center and move it to the ATS, which means I need to replace it.. Utility power will be obviously shut down for this. I then need to run a feed back to the load center, and was planning to use 2" conduit with 3/0 CU individual conductors.

It would make my life easier to run 3/0 CU SE-U instead of 4/0 AL SE-U from the meter pan to the ATS because of the bends and twists once it enters the house to get it to the ATS.

I was simply wondering if there is a good online resource to buy about 8 feet of copper or if I shouldn't even bother if the hassle to find it is greater than wrestling with the 4/0 AL. I am also curious if anyone else sees the benefit to copper for a short and twisty service run such as this..
 

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Master Electrician
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1,165 Posts
I hardly ever see aluminum anymore. We always use copper so its easy to find here, but unless your close to the border that's useless lol.
 

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Licensed Electrical Cont.
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Why 3/0???
2/0cu SEU is good for a residential 200A service. Even that might be hard to find in short lengths in some areas.
 
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