[AT] grounds

Mattias Kessén davidbrown950 at gmail.com
Mon Dec 17 02:22:02 PST 2007


400 A! My god. I knew everything is bigger in America! But... :-o That can't
be all for x-mas decoration.

Mattias


2007/12/17, Dudley Rupert <drupert at premier1.net>:
>
> 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
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