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

Matt Tritt solarone at charter.net
Sat Jul 25 18:38:39 PDT 2009


Yay, Ray,

That's what I like to hear!

Matt T

R. Walters wrote:

> I've worked on supposedly ungrounded high voltage systems on Electric 
> vehicles. Got zapped when I touched the frame and a battery terminal. 
> There definitely can be mA of leakage to ground, even if its not 
> supposed to be there. Otherwise I welcome the move to ungrounded DC. 
> Gee, red is positive, black for negative color coding is actually NEC 
> compliant on an ungrounded system.....
>
> R. Walters
> Solarray.com
> NABCEP # 04170442
>
>
>
> On Jul 25, 2009, at 10:03 AM, boB Gudgel wrote:
>
>> toddcory at finestplanet.com <mailto:toddcory at finestplanet.com> wrote:
>>
>>> "If neither pole is grounded then both must be treated as 
>>> potentially hot."
>>>
>>> _Only with regard to the other hot wire._ If you do not reference 
>>> one conductor to ground than the other one will not present any 
>>> danger unless you are referenced to its mate... as in touching both 
>>> wires at once.
>>>
>>> Todd
>>
>> Except of course, if there is more leakage (capacitive) from one 
>> ungrounded wire to ground than the other ungrounded wire to
>> ground.   You may still feel a tingle... The higher the voltage, 
>> given similar leakage, the higher the tingleage. (is that a real word?)
>> I am more apprehensive about touching ungrounded and live things 
>> (although sometimes I do). People have a larger area and
>> therefore a higher capacitance than birds do.
>>
>> This applies for AC (mainly) of course.
>>
>> boB
>>
>>
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