[RE-wrenches] Question

[penobscotsolar at midmaine.com]

Sorry, 200 amp main breaker in a 400 amp rated panel.


> Hi Daryl,
>
> From your description, yes, if you are attaching to lugs connected to
> busses and then to the 400A main breaker, with no other overcurrent device
> between, you would have to size the wire for the 400A rating.
>
> Brian Teitelbaum
> AEE Solar
>
> -----Original Message-----
> From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
> Behalf Of penobscotsolar at midmaine.com
> Sent: Thursday, June 15, 2017 4:10 PM
> To: RE-wrenches
> Subject: Re: [RE-wrenches] Question
>
> I re-read and see that I need to clarify my earlier question. The 400 amp,
> 120/208 panel has a main breaker that will be used for the utility input,
> coming in on 3/0 copper.  The four 60 amp breakers will be used because
> the four 10 kW inverters maximum ac output is 48 amps each (x 1.25 =60
> amps ocpd). On the opposite end of the 400 amp panel there are main lugs
> which will be used to feed the generator transfer switch, essentially,
> because the inspector says we cannot put more than "two in, one out" on
> the gentran. These wires to the gentran are what I am wondering how best
> to size. Common sense tells me they should be rated the same as the main
> panel breaker from the utility. Is this a correct assumption?
>
>
>> Esteemed wrenches,
>>    We're working often in the Bahamas and now that net metering is
>> approved there, the inspectors are far behind in their comprehension.
>> That said, we are currently required to combine the utility with the
>> PV in a main load center before going to the generator transfer
>> switch. I have a 400 amp rated load center with a 200 amp, 120/208
>> main breaker on it, as well as four 60 a, 3 pole breakers that will be
>> fed from four
>> 10 kw inverters. My question is, will it be necessary to use wire
>> rated at 400 amps or can I use wire rated for the main breaker? Thank
>> you for your input. It might be a stupid question, but I am stymied
>> here....it might just be the Lyme, not sure.....oh, and it's CEC 2015
>> down there, but I suspect it will align with NEC 2014.
>>
>> Thanks again,
>> Daryl DeJoy
>> NABCEP Certified PV
>> Penobscot Solar Design
>>
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