[AT] grounds

charlie hill chill8 at suddenlink.net
Mon Dec 17 06:08:01 PST 2007


It seems to me that using two or more ground rods that are connected 
together to form a ground grid might solve the problem and add some 
insurance for bad grounds.

Charlie
----- Original Message ----- 
From: "Michael Miller" <sweetcorn70 at hotmail.com>
To: <at at lists.antique-tractor.com>
Sent: Monday, December 17, 2007 8:09 AM
Subject: Re: [AT] grounds


> Dudley,
>
> Google "Stray Current".
>
> I may be wrong, but what I understand about this phenominon(sp?)
> specifically deals with stray current lowering production on dairy farms.
> IIRC, one way to prevent it is to have everything grounded in one place 
> with
> one rod.  If you have two ground rods in your farm stead it can allow 
> stray
> voltage.   In most cases it isn't enough to hurt you but one reason it is 
> a
> bad thing on dairy farms is because the cows can pick up a lot lower 
> voltage
> than us, so they get shocked and we don't know what is going on.
>
> Sorry I can't explain more but I am in no way an electrical engineer :-D
>
> Mike
>
>
>>From: "Dudley Rupert" <drupert at premier1.net>
>>Reply-To: Antique tractor email discussion group
>><at at lists.antique-tractor.com>
>>To: "Antique tractor email discussion group" 
>><at at lists.antique-tractor.com>
>>Subject: Re: [AT] grounds
>>Date: Mon, 17 Dec 2007 01:20:04 -0800
>>
>>Warren,
>>
>>I am not suggesting at all that you doubt your' friend but I am curious as
>>to what his reasoning would be for advising you not to connect the sub
>>panel
>>in your' shop to its' own ground rod ... or at least this is what I think 
>>I
>>hear you saying.
>>
>>
>>I wired the house I am living in with 400 amp service (this is more like
>>commercial than the typical residential service) and then ran 3-wire 240
>>from the house down to the barn and put a 100 amp sub panel there with the
>>ground lug connected to a ground rod (and, of course, to the neutral wire
>>from the house panel).  This was permitted/inspected but it was thirty
>>years
>>ago so maybe something has changed since then.
>>
>>
>>I did redo the main entry service to my daughter and SIL's place this past
>>summer.  The main house has the 325 amp service coming in from the road. 
>>I
>>don't know if the 325 amp service is available all across the country or
>>not
>>but for little more $$ than it costs for a 200 amp service (particularly 
>>if
>>you've got dad providing the labor for coffee/sandwich/cookies) you've got
>>closer to a 400 amp service than 200.  Their guesthouse, shop and barn 
>>each
>>has its' own sub panel and grounding rod and is serviced by 3-wire 240 
>>from
>>the main house.  This was permitted/inspected as well but as I wasn't 
>>there
>>when the inspector came I can't say for sure that he would have even 
>>looked
>>at the service to/at the "out buildings" as I applied only to change the
>>main entry service.
>>
>>
>>I can think of three or four other inspected services I've done where I've
>>installed a sub panel/grounding rod (in addition to the main service) but
>>none within the past ten years so that bit of history/memory is of no 
>>help.
>>My copy/edition of the NEC is thirty or more years old so it's of no help
>>either.  In conclusion I guess I've just been trying to give a bit of my
>>thinking as to why I am wondering at what your' friend told you regarding
>>not installing the ground rod at your' shop but I am most likely the one
>>that's got some new learning to do.
>>
>>Dudley
>>Snohomish, Washington
>>
>>-----Original Message-----
>>From: at-bounces at lists.antique-tractor.com
>>[mailto:at-bounces at lists.antique-tractor.com]On Behalf Of Mogrits
>>Sent: Sunday, December 16, 2007 10:24 PM
>>To: Antique tractor email discussion group
>>Subject: [AT] grounds
>>
>>This is all anecdotal but nevertheless:
>>
>>I have a 10kw briggs powered generator with a grounding lug on the
>>generator
>>housing. When I use the genset to power the house I connect the 
>>houseground
>>to the generator by a copper wire I leave connected and coiled up just
>>below
>>the house service.
>>
>>When I built my shop a few hundred feet from the house and wanted to power
>>it from the house service instead of a separate meter I asked my 
>>electrical
>>engineer friend about installing a ground rod and he advised me to NOT
>>separately ground the building. He says the ground should come from the
>>same
>>source as the power, so I ran four-wire mobilehome service cable up to the
>>shop.
>>
>>Warren
>>No virus found in this outgoing message.
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>>12/14/2007
>>11:29 AM
>>
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