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Rotary phase converter: local ground or all the way to the panel?

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Rotary phase converter: local ground or all the way to the panel? rpseguin 02-27-2008
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Posted by hallerb@aol.com on February 27, 2008, 1:51 pm
> On Wed, 27 Feb 2008 09:04:23 -0800 (PST), rpseguin
>
>
>
>
>
> >Ok.
> >Thanks for everybody's help in the earlier thread.
> >The 20HP rotary phase converter is working, but I now need to place it
> >in the garage, about 70+ feet wiring run distance from the main
> >breaker panel.
>
> >Given the cost of copper wire these days, my inclination is to run
> >just the two hots to the panel and to put a grounding rod close up to
> >the garage and run a local ground to it.
> >I see no reason to run a neutral line from the panel (the machines are
> >all 3 phase).
>
> >I know that I could run a ground line to the panel AND run a local
> >grounding rod, but is it a bad idea to just do a local ground?
>
> >What gage wire for a 20HP RPC, but the main/biggest load/machine will
> >be a 10HP spindle and a couple of 2HP machines, never all at the same
> >time? =EF=BF=BD($ signs get much bigger with the wire gage/diameter :-)
>
> >Anybody near San Jose, CA have a spool of #4 or larger gage for
> >cheap? :-)
>
> >Thanks in advance!
>
> You can get by with #10 Green..but...
>
> Go all the way to the panel.
>
> While life is cheap, replacing you can be expensive
>
> Gunner- Hide quoted text -
>
> - Show quoted text -

copper is costly but why install something you know wouldnt pass code,
or a future home inspection.

do it right do it once then relax and forget about it

PexSupply Save 50 468x60
Posted by rpseguin on February 27, 2008, 2:27 pm
>
>
>
> > On Wed, 27 Feb 2008 09:04:23 -0800 (PST), rpseguin
>
> > >Ok.
> > >Thanks for everybody's help in the earlier thread.
> > >The 20HP rotary phase converter is working, but I now need to place it
> > >in the garage, about 70+ feet wiring run distance from the main
> > >breaker panel.
>
> > >Given the cost of copper wire these days, my inclination is to run
> > >just the two hots to the panel and to put a grounding rod close up to
> > >the garage and run a local ground to it.
> > >I see no reason to run a neutral line from the panel (the machines are
> > >all 3 phase).
>
> > >I know that I could run a ground line to the panel AND run a local
> > >grounding rod, but is it a bad idea to just do a local ground?
>
> > >What gage wire for a 20HP RPC, but the main/biggest load/machine will
> > >be a 10HP spindle and a couple of 2HP machines, never all at the same
> > >time? =EF=BF=BD($ signs get much bigger with the wire gage/diameter :-)=

>
> > >Anybody near San Jose, CA have a spool of #4 or larger gage for
> > >cheap? :-)
>
> > >Thanks in advance!
>
> > You can get by with #10 Green..but...
>
> > Go all the way to the panel.
>
> > While life is cheap, replacing you can be expensive
>
> > Gunner- Hide quoted text -
>
> > - Show quoted text -
>
> copper is costly but why install something you know wouldnt pass code,
> or a future home inspection.
>
> do it right do it once then relax and forget about it

I'll do it the right way and run it to the panel.

I'm just renting the house, which, by the way, doesn't have any
grounded outlets other than a couple of GFIs in the bathrooms.
The landlord did put 3 prong grounded receptacles in, even though
there's no ground wires in any of them.


Posted by on February 27, 2008, 4:01 pm

| I'm just renting the house, which, by the way, doesn't have any
| grounded outlets other than a couple of GFIs in the bathrooms.
| The landlord did put 3 prong grounded receptacles in, even though
| there's no ground wires in any of them.

They don't make very many 2-prong ungrounded GFCI receptacles, even
though such things would work and can even do a self-test without a
ground wire.

--
|---------------------------------------/----------------------------------|
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
| first name lower case at ipal.net / spamtrap-2008-02-27-1459@ipal.net |
|------------------------------------/-------------------------------------|

Posted by Chris Lewis on February 27, 2008, 4:09 pm
>
> | I'm just renting the house, which, by the way, doesn't have any
> | grounded outlets other than a couple of GFIs in the bathrooms.
> | The landlord did put 3 prong grounded receptacles in, even though
> | there's no ground wires in any of them.
>
> They don't make very many 2-prong ungrounded GFCI receptacles, even
> though such things would work and can even do a self-test without a
> ground wire.

True. But to clarify: three prong GFCI receptacles that aren't grounded
are legal. Ungrounded three prong outlets _downstream_ of a GFCI are
also legal (as a retrofit), as long as you use the stickers saying
"ungrounded outlet" on them.
--
Chris Lewis,

Age and Treachery will Triumph over Youth and Skill
It's not just anyone who gets a Starship Cruiser class named after them.

Posted by on February 27, 2008, 8:07 pm
|>
|> | I'm just renting the house, which, by the way, doesn't have any
|> | grounded outlets other than a couple of GFIs in the bathrooms.
|> | The landlord did put 3 prong grounded receptacles in, even though
|> | there's no ground wires in any of them.
|>
|> They don't make very many 2-prong ungrounded GFCI receptacles, even
|> though such things would work and can even do a self-test without a
|> ground wire.
|
| True. But to clarify: three prong GFCI receptacles that aren't grounded
| are legal. Ungrounded three prong outlets _downstream_ of a GFCI are
| also legal (as a retrofit), as long as you use the stickers saying
| "ungrounded outlet" on them.

How about one of those grounded plug adapters ... the kind where you have
3 holes on one end to plug in a grounded plug, and only 2 prongs on the
other end to plug into a legacy 2-hole no-ground outlet ... that integrates
GFCI protection as part of the adapter? I've seen GFCI cord sets, but only
with a grounded plug. How about with an ungrounded plug?

--
|---------------------------------------/----------------------------------|
| Phil Howard KA9WGN (ka9wgn.ham.org) / Do not send to the address below |
| first name lower case at ipal.net / spamtrap-2008-02-27-1904@ipal.net |
|------------------------------------/-------------------------------------|

Page 2 of 5       < 1 2 3 > last >>
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