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

[boB Gudgel]

Darryl Thayer wrote:
> The reason for grounding to limit the hazards associated with fault conditions.  If a utility source is unintensionally connected to high voltage the pair of wires can be at elevated voltage.  example would be if a 13,000 volt line falls onto a 120 volt line, the 120 volt line can be raised to 13,000 volts, and the victium would be fried.  So we ground such that the 120 line can not get higher than 120 volts above ground. 
>
> The reference to ground is because we are referenced to ground as we stand bare foot and 
>
> Darryl
>
>   

I always heard that grounding was primarily for lightning protection.
boB





> --- On Fri, 7/24/09, Todd Cory <toddcory at finestplanet.com> wrote:
>
>   
>> From: Todd Cory <toddcory at finestplanet.com>
>> Subject: Re: [RE-wrenches] Fwd: Grounding on a glacier??
>> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
>> Date: Friday, July 24, 2009, 10:50 AM
>>
>>
>>
>>   
>>   
>>
>>  
>> I have heard that
>> this
>> requirement (to bond negative to ground) as well as bonding
>> one of the
>> AC conductors to ground (neutral wire) was pushed through
>> by wire
>> manufactures and unions. The wire manus sell more of their
>> product and
>> the electricians get more labor in installing them. I also
>> agree that
>> grounding any live conductor actually makes the system less
>> safe.
>>
>>
>>
>> When I have traveled over seas, I always try to open the
>> main panel to
>> see how things are laid out. They never associate one of
>> their power
>> conductors (usually 240 v) to ground.
>>
>>
>>
>> Todd
>>
>>
>>
>>
>>
>> Matt Tritt wrote:
>>
>>   
>> 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
>>
>>
>>
>>
>>  
>>
>>
>>  
>>
>>
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>>
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