Sorry Rich, you are not correct. The voltage is irrelevant. Neutral
carries current, ground never carries current unless there is a fault. The
diagram of the SB220/221 plug that I have clearly shows the green wire to
ground in the plug for both 120V and 240V setups.
Bill N2BC
----- Original Message -----
From: "R. Measures" <r@somis.org>
To: "Bill Coleman" <n2bc@stny.rr.com>; <Ku4uk@aol.com>; "AMPS"
<amps@contesting.com>
Sent: Saturday, December 06, 2003 5:01 PM
Subject: Re: [Amps] RE 220 V
>
>
> >NOT TRUE.
>
> ** It's true on my SB-220. When wired for 240V, the third wire (green)
> goes to the neutral on the 240v 3-conductor plug and the other end of
> this wire goes to chassis. On a 3-conductor 240v circuit, the ground is
> the neutral. 0v = 0v.
> >
> >There may be older vintages of the SB-220. But I looked at an undated
> >SB-220 schematic and an SB-221 schematic dated 1976. Both of these
clearly
> >show GROUND to the chassis - the wire is labelled GREEN and the
picto-gram
> >of the plug clearly shows it connected to the ground lug. When wired for
> >240V, there is no need for a neutral on an SB-220/221.
> >
> >If in fact early SB-220s wired neutral to the chassis, they should be
> >changed. Just because they did it at one time doesn't make it correct
> >today. The Collins KWS-1 shipped with neutral to the chassis and they
> >should all be changed. Lots of Johnson and Heath gear shipped with those
> >deadly fuse plugs - they should be changed!
> >
> >We need to move on.
> >
> >
> >----- Original Message -----
> >From: "R.Measures" <r@somis.org>
> >To: <Ku4uk@aol.com>; "AMPS" <amps@contesting.com>
> >Sent: Friday, December 05, 2003 9:25 PM
> >Subject: Re: [Amps] RE 220 V
> >
> >
> >>
> >>
> >> >No one has said anything about the heathkit SB 22O wiring. It has two
hot
> >> >wires to transformer and neutral to chassis
> >>
> >> Neutral does not go to the chassis when a 220 is wired for 120V, but
> >> wired for 240v it does
> >>
> >> >....
> >> _______________________________________________
> >> Amps mailing list
> >> Amps@contesting.com
> >> http://lists.contesting.com/mailman/listinfo/amps
> >>
> >
> >
> >
>
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