busbar overload with a GVFX-3648 is NOT a reality [RE-wrenches]

[Ray Walters]

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I agree with you whole heartedly Todd, unfortunately article 690.64b 
says "the sum of the ampere ratings of the _overcurrent devices_ 
supplying power TO the busbar...."   :  Its the # stamped on the 
breaker, not reality.
See I agree with the spirit of the code, in that we don't want to 
overload the bussbar, but the code wording or the way Outback, etc. wire 
their inverter outputs needs to change. Right now any inspector could 
boom us, no matter how reasonable your logic is.
It's funny how this business has been: people thumping the code book 
like the holy gospel of truth, and a few years later we get things 
changed to be reasonable, and they act like it never happened. Remember 
when we had to run 4/0 cable to the ground rod? The code is reactive not 
proactive. It is us, the wrenches in the field that determine the state 
of the art along with the manufacturers, and then the code clunks along 
5 to 10 years after.  Don't forget it, and don't let the bearucratic 
bible thumpers forget who is leading this industry either: us.

Damn hard work, the pay sucks, but I love it,

Ray Walters
SolarRay, Inc.

Todd Cory, Mt. Shasta Energy Services wrote:

>
> IMO reality needs to be considered. The sum of all sources can't 
> exceed 120% of the busbar rating (NEC 690.64b(2)) of the panel.120% of 
> 200A is 240A. With a 200A main breaker, you can also have up to a 40A 
> inverter feed. A GVFX3648 is only capable of a continuous supply of 30 
> amps.
>
> My math shows 30 amps as less than 40 amps... yes, it is fed with a 60 
> amp breaker with a bi-directional current flow. 60 amp is load not 
> supply. Supply  is 30.
>
> The REALITY is a GVFX-3648 is INCAPABLE of damaging a 200 amp busbar 
> in the highly unlikely event there were 230 amps flowing through it... 
> so what the heck is the stink all about here???
>
> Todd
>
>
> Jeff Oldham wrote:
>
>> Hey Wrenches, why do you have so much resistance to line taps placed 
>> between the meter and main breaker? This is so easy and cheap and 
>> takes very little time, although I don't care for them, there are 
>> even self-piercing taps that you don't even need to break any 
>> connections for or have a service disconnect to install.
>> Personally, I would never down size a main breaker (and thus my 
>> customers service size) to get around the simple fix above.
>>  
>>
>
>
>


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