Mobile system grounding [RE-wrenches]

Sat Jul 28 23:35:42 PDT 2001

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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!
>> >
>> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> >      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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>>
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>To send a message: RE-wrenches at topica.com
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>
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>
>

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