[RE-wrenches] Fwd: Grounding on a glacier??

[Matt Tritt]

As long as we're already on the subject, BESIDE the NEC requiring it, 
why is it that we have to bond the ungrounded conductor on the battery 
side of a DC system??? I believe that we are the only country in the 
world that has this requirement. As long as all the system cabinets, 
mounting plates, housings and etc are grounded, what is gained by 
including a battery conductor? I'm not talking about HV inputs from an 
array, just the battery busses.

I have been asking this question since forever, and the only explanation 
seems to be the recital of the Code. Obvious problems can occur when 
there is a + grounded piece of equipment in the mix, since - well, it's 
obvious.

Matt T

boB Gudgel wrote:

> Larry Crutcher, Starlight Solar wrote:
>
>> Hi Jay,
>>
>> An interesting quandary indeed.
>
>
> This is another good example of an application that I was trying to 
> grill Sunpower about --- as far as grounding their modules that need 
> to be positive grounded
> in order to take advantage of their higher efficiencies.   They 
> couldn't answer this simple question.  How would you use one in an 
> airplanefor instance ?
> There are solar powered airplanes (sort  of)   Is a large faraday 
> shield enough ?   Sort of like the ground radials that Larry has 
> mentioned.  I would
> imagine that if you get large enough radials that it ~might~ approach 
> being a virtual ground. Works for antennas though.
>
> I like questions like this one.  Sure makes one think a bit.
>
> boB
>
>
>
>
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