Mobile system grounding [RE-wrenches]

[Drake Chamberlin - Electrical Energy]

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The NEC allows vehicle mounted generators to be grounded to the frame.   Is 
an inverter mounted on a vehicle substantially different from an engine 
generator electrically?  Below is the Code section.

(b) Vehicle-Mounted Generators. The frame of a vehicle shall be permitted 
to serve as the grounding electrode for a system supplied by a generator 
located on the vehicle under the following conditions:
1. The frame of the generator is bonded to the vehicle frame, and
2. The generator supplies only equipment located on the vehicle or cord- 
and plug-connected equipment through receptacles mounted on the vehicle, or 
both equipment located on the vehicle and cord- and plug-connected 
equipment through receptacles mounted on the vehicle or on the generator, and
3. The noncurrent-carrying metal parts of equipment and the equipment 
grounding conductor terminals of the receptacles are bonded to the 
generator frame, and
4. The system complies with all other provisions of this article.
(c) Grounded Conductor Bonding. A system conductor that is required to be 
grounded by Section 250-26 shall be bonded to the generator frame where the 
generator is a component of a separately derived system.


At 10:30 AM 07/27/2001 -0400, you wrote:
>Hi All,
>
>We have our mobile trailer. Yes, we drive a ground rod EVERY time we use
>it. We've developed an unsatisfactory system for pulling the ground rod,
>but haven't lost one yet.
>
>I think what Gary is talking about is GFI outlets, not PVGFP. The GFI
>outlets are a good idea. If you're at any fairs, and many other events, the
>trailer electrical will be site inspected. They'll be looking for some form
>of GFI protection on any extension cord, etc., and this is the easiest way
>to do it. We mounted some duplex (non-GFI) receptacles inside the trailer,
>and put two duplexes in a WP box outside, each GFI on a different circuit.
>
>We also put a pipe nipple through the side of the trailer to run the ground
>out. This way, we can hook it up, and close the doors and lock it up while
>it's operation. Means we don't need to stand around and protect it from
>fiddling fingers while we power Ben & Jerry's!
>
>Jeff
>
>
>----------
>From:   Travis Creswell, Ozark Solar[SMTP:ozsolar at ipa.net]
>Reply To:       RE-wrenches at topica.com
>Sent:   Thursday, July 26, 2001 9:44 PM
>To:     RE-wrenches at topica.com
>Subject:        Re: Mobile system grounding [RE-wrenches]
>
>Do you realize you'll have to drive a ground rod every time you park it?
>Why the PVGFP?  If no one is sleeping in the unit then PVGFP is not
>required
>(the way I interpret code).
>
>Travis
>----- Original Message -----
>From: "Gary Higbee, Solutions from the Land" <ghigbee at efn.org>
>To: <RE-wrenches at topica.com>
>Sent: Thursday, July 26, 2001 1:42 PM
>Subject: Mobile system grounding [RE-wrenches]
>
>
> > Hi Wrenches,
> >
> > I'd appreciate any tips on how you do the grounding (and any other
>notable
> > items) on mobile systems. I'm working on an 800-watt trailer-mounted
>system
> > with preconfigured Trace Power Module containing a C-40, PVGFP, SW
>inverter,
> > and associated disconnects. I plan to supply ground-fault protected
>outlets
> > via a standard AC breaker panel in the equipment bay.
> >
> > Thank you!
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >      Gary Higbee  (ghigbee at efn.org)
> >           (541)607-1818 (Eugene)
> >          (541)902-8544 (Florence)
> >    Solar, wind, and hydro site analysis,
> >     design, and installation assistance
> >          ~Solutions from the Land~
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
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