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

[Darryl Thayer]

No, Lightening protection is generally for the building structure. grounding may endanger the equipemt during a electrical storm.  Lightening is always trying to find a ground, system protection, normal grounding is for when the electrical system is a source of problems.

DT   

--- On Fri, 7/24/09, boB Gudgel <boB at midnitesolar.com> wrote:

> From: boB Gudgel <boB at midnitesolar.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, 2:33 PM
> 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
> >>
> >>
> >>
> >>
> >>  
> >>
> >>
> >>  
> >>
> >>
> >> -----Inline Attachment Follows-----
> >>
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