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 <toddc...@finestplanet.com> wrote:
From: Todd Cory <toddc...@finestplanet.com>
Subject: Re: [RE-wrenches] Fwd: Grounding on a glacier??
To: "RE-wrenches" <re-wrenches@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-----
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
_______________________________________________
List sponsored by Home Power magazine
List Address: RE-wrenches@lists.re-wrenches.org
Options & settings:
http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
List rules & etiquette:
www.re-wrenches.org/etiquette.htm
Check out participant bios:
www.members.re-wrenches.org
