The 120% rule applies to both commercial and residential from the 2008 code on.
Kirk Herander
VSE
On Jun 17, 2013, at 2:58 PM, Allan Sindelar
wrote:
> Pekka,
> I believe that the 120% rule is only for residential application. Unless it's
> changed (and I don't do commercial any more, so I may
Laine
Sent: Monday, June 17, 2013 10:34
To: re-wrenches@lists.re-wrenches.org
Subject: [RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service
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 dedi
Pekka,
I believe that the 120% rule is only for residential application.
Unless it's changed (and I don't do commercial any more, so I may
be all wet here) you're limited to 100% on commercial
applications. The assumption is that a commercial service may
alr
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 wrote:
> Dea
Pekka:
160A is not a "standard" OCPD value (NEC 2011; 240.6). I'd go with the
next smaller size, or 150A. I would size the ampacity of the feeder
conductors for 175A.
Regards,
Gary Willett
Icarus Engineering
On 6/17/13 12:33 PM, Pekka Laine wrote:
Dear Fellow Wrenches,
We have a small 50k
a Laine
To: re-wrenches@lists.re-wrenches.org
Sent: Monday, June 17, 2013 10:33 AM
Subject: [RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service
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 i
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 m
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