What John was asking about was a dedicated 220 line with 4 wires run and
terminating in a 3 hole outlet. Two hot and a GROUND that would feed a 3
wire plug for his amp. The extra wire in this case would be the neutral wire
which the amp does not use. Now as I explained, if these are indeed fed from
a standard entrance panel where the neutral and ground are bonded together
in that panel, then the neutral and ground wires go to the same place in the
panel. At the outlet, since only ground is going to be used (3 wire outlet,
not 4) then if that neutral wire was connected to the ground wire at the
outlet or not, it would make absolutely no difference as both would serve as
ground wires in this case. Again, there is no neutral used here...
But for wiring clarity for future use, as I said it would probably be best
to just put a wire nut on the unused neutral wire at the outlet and leave it
hang. One day someone may want a 4 wire outlet there and there would be less
confusion as to what that 4th wire was for.
73
Gary K4FMX
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On Behalf Of James R Carr
> Sent: Monday, April 04, 2011 5:55 PM
> To: jim@audiosystemsgroup.com; amps@contesting.com
> Subject: Re: [Amps] Fw: Re: 4 wire 240VAC service? What to do now?
>
> the green equipment/safety ground wire must never ever carry current
> excepto
> clear a fault, (blow the fuse) when a hot wire has touched or otherwise
> found a current path to the grounded enclosure. If the neutral alone was
> sufficient, the green/bare wire wouldn't have been added sixty years
> agoin
> the 1950's
> Jim
> N7FCF
> ----- Original Message -----
> From: "Jim Brown" <jim@audiosystemsgroup.com>
> To: <amps@contesting.com>
> Sent: Monday, April 04, 2011 2:44 PM
> Subject: Re: [Amps] Fw: Re: 4 wire 240VAC service? What to do now?
>
>
> > On 4/4/2011 2:23 PM, Gary Schafer wrote:
> >> It makes no difference if they are both tied together at the outlet
> in
> >> your
> >> case provided,, that is a straight run to the panel with no other
> outlets
> >> along the way and the panel serving it is the main service entrance
> panel
> >> and not a sub panel.
> >
> > Oh -- but it DOES matter if you twist neutral and green together and
> > connect them to the power amp chassis, and you MUST connect the green
> to
> > the power amp chassis!
> >
> >> Note that sometimes a main panel is wired as a sub panel with the
> main
> >> breaker located outside the house and the distribution panel located
> >> inside.
> >> In this case the main breaker panel outside is your main service
> entrance
> >> panel and the ground and neutral would be bonded there and not in the
> >> distribution panel located inside.
> >
> > Yes.
> >
> >> The best thing to do with the neutral wire at the outlet if you are
> going
> >> to
> >> use only the ground is to put a wire nut on the neutral wire and
> leave
> >> it.
> >
> > Yes.
> >
> > 73, Jim K9YC
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> > Amps@contesting.com
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>
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