Mobile system grounding [RE-wrenches]

[Bob-O Schultze, Electron Connection]

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Right on the money, Drake. I would only add that if you plan on 
recharging the batteries through a line cord to a grid or generator 
connection, you might want to consider using the Trace SW XXXXMC (for 
Motor Coach) version of inverter. BTW, you can still get the good old 
SW2512 in a MC version.
Bob-O

>In the last message, the first part of the section dealing with 
>vehicle mounted generators didn't make it into the communication. 
>Below is the missing first part of the section.
>
>250-34. Portable and Vehicle-Mounted Generators
>(a) Portable Generators. The frame of a portable generator shall not 
>be required to be grounded and shall be permitted to serve as the 
>grounding electrode for a system supplied by the generator under the 
>following conditions:
>1. The generator supplies only equipment mounted on the generator or 
>cord- and plug-connected equipment through receptacles mounted on 
>the generator, or both, and
>2. The noncurrent-carrying metal parts of equipment and the 
>equipment grounding conductor terminals of the receptacles are 
>bonded to the generator frame.
>
>At 12:25 AM 07/29/2001 -0600, you wrote:
>>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!

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