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Posted by John Grabowski on September 7, 2008, 7:53 pm
> >I will be installing a standby generator located about 50 ft. from the
> > grounding rod for my house. If I ground the generator only in main
> > panel,
> > then there is a possibility that the generator frame will be at a
> > slightly
> > different potential than the adjacent earth on which someone touching
> > the
> > generator may be standing. If I install a ground rod at the generator
> > location, then I will be introducing a ground loop with its associated
> > problems.
> > How, according to the NEC, should the generator be grounded? Please
> > provide a code reference (or quote) if you can.
> > Many thanks for any help.
> There should be grounding requirements in the installation instructions.
> Generally there is an external ground lug on the frame or housing of the
> generator. This would get connected to your grounding electrode conductor
> for lightning protection. There should also be an equipment grounding
> conductor that is run with generator conductors to the transfer switch or
> panel that you will be supplying the generator power to.
The gen only needs small wire attached to even a long nail driven into
the ground, a lightning rod is overkill
LOL. You guys are making me laugh tonight. Thanks. This reminds of the
person a few years back who posted about sticking a wire from her computer
out the window to a coat hanger in the ground because her house was not a
grounded system.
Maybe on the next job I'll connect a ground wire good for 7000 amps to a
long nail and show the inspector this thread. LOL
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Posted by Blattus Slafaly on September 7, 2008, 5:30 pm
NoSpam@aol.com wrote:
> I will be installing a standby generator located about 50 ft. from the
> grounding rod for my house. If I ground the generator only in main panel,
> then there is a possibility that the generator frame will be at a slightly
> different potential than the adjacent earth on which someone touching the
> generator may be standing. If I install a ground rod at the generator
> location, then I will be introducing a ground loop with its associated
> problems.
>
> How, according to the NEC, should the generator be grounded? Please
> provide a code reference (or quote) if you can.
>
> Many thanks for any help.
The only grounding requirement on my generator is the plug from the
power panel. Two hots, a neutral and a ground.
--
Blattus Slafaly ? 3 :) 7/8
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Posted by on September 7, 2008, 8:52 pm
I really do appreciate all you folks who took the time to reply. However,
the subject began "code question" amd so far none of the replies have tried
to answer the question based on code. Also the question asked was "How,
according to the NEC, should the generator be grounded?" Does anyone have
an answer based upon their knowledge of the NEC?
As to the long nail suggestion you may be very certain that the nail will
not be connected well to the ground when it is new and much less so after
it begins to rust. That is why long ground rods are used and why two are
sometimes required. That is also why they are made of copper. Yes the
outside of the copper will corrode but the copper oxide, unlike rust, is
conductive.
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Posted by on September 7, 2008, 9:59 pm
On Sun, 07 Sep 2008 20:52:48 -0400, NoSpam@aol.com wrote:
>I really do appreciate all you folks who took the time to reply. However,
>the subject began "code question" amd so far none of the replies have tried
>to answer the question based on code. Also the question asked was "How,
>according to the NEC, should the generator be grounded?" Does anyone have
>an answer based upon their knowledge of the NEC?
>As to the long nail suggestion you may be very certain that the nail will
>not be connected well to the ground when it is new and much less so after
>it begins to rust. That is why long ground rods are used and why two are
>sometimes required. That is also why they are made of copper. Yes the
>outside of the copper will corrode but the copper oxide, unlike rust, is
>conductive.
OK short code answer.
You connect the frame of the generator to the grounding system of the
house always
If the transfer switch also switched the white (neutral) you bond the
neutral in the generator to the frame.
(that is a separately derived system)
If the transfer switch only switches the hots do not bond the neutral,
it gets bonded via the bonding jumper in your service disconnect for
the utility feed.
That is not a separately derived system..
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Posted by on September 7, 2008, 9:34 pm
On Sep 7, 11:35=A0am, NoS...@aol.com wrote:
> I will be installing a standby generator located about 50 ft. from the
> grounding rod for my house. =A0If I ground the generator only in main pan=
el,
> then there is a possibility that the generator frame will be at a slightl=
y
> different potential than the adjacent earth on which someone touching the
> generator may be standing. =A0If I install a ground rod at the generator
> location, then I will be introducing a ground loop with its associated
> problems.
> How, according to the NEC, should the generator be grounded? =A0Please
> provide a code reference (or quote) if you can.
> Many thanks for any help
Grounding and bonding depend on whether or not is a seperatley derived
system or not. I assume you are permanantly mounting the generator
and it is not a portable unit. I also assume you are installing a
transfer switch. Is this correct? NEC 2005 Article 250 is where to
look.
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> > grounding rod for my house. If I ground the generator only in main
> > panel,
> > then there is a possibility that the generator frame will be at a
> > slightly
> > different potential than the adjacent earth on which someone touching
> > the
> > generator may be standing. If I install a ground rod at the generator
> > location, then I will be introducing a ground loop with its associated
> > problems.
> > How, according to the NEC, should the generator be grounded? Please
> > provide a code reference (or quote) if you can.
> > Many thanks for any help.