[RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service

[Brian Mehalic]

True, as mentioned 160 is not a standard size, but you also cannot use a smaller size for a load side connection, unless you can use/find equipment rated for continuous duty...then you'd only need a 125A OCPD.

Typos courtesy of my iPhone. 

On Jun 17, 2013, at 1:33 PM, Pekka Laine <pekka at photonsolarpower.com> wrote:

> Dear Fellow Wrenches,
> 
> We have a small 50kW 120/208V commercial job with five 9kW 3PH inverters, each outputting max. 25A.  We are landing those into a dedicated load center with five 40A breakers. Doing the math, 5 x 25A x 1.25 = 156.25A, we would need a 160A breaker.  This also equals to the maximum we can backfeed into a 800A/800A Main Service on the load side according to the "120%" rule.
> 
> The problem now is that we cannot locate any kind of 160A breaker or even a 160A fuse for a AC disconnect.
> 
> Has anybody ever done this without doing a "line-side tap?" It is hard to believe that there wouldn't be an existing solution to landing maximum PV into a 800A service. Are we missing something?
> 
> Any good ideas or comments would be appreciated.
> 
> Sincerely,
> 
> Pekka Laine
> 
> President
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