[AMRadio] 220 volt AC Power Question


Mike Dorworth, K4XM k4xm at arczip.com
Mon Oct 30 20:23:32 EST 2006


Jim I do not know the laws but all new dryers have four wire cords. Only the
old ones are three. The ground wire would need to be twice as big as either
hot wire. By the codes I don't think you can use a neutral for fault
current. At the box, the neutral and ground are tied together. Most stoves
and dryers are 220 and the third wire is for the fuse blowing function only
but there must be exceptions. Hope the electricians let you know exactly. 73
Mike

----- Original Message ----- 
From: "Jim candela" <jcandela at prodigy.net>
To: "Discussion of AM Radio in the Amateur Service"
<amradio at mailman.qth.net>
Sent: Monday, October 30, 2006 8:09 PM
Subject: [AMRadio] 220 volt AC Power Question


>
>
> Hi all,
>
>    I am building an amplifier that has a combination of 220 volt and 120
> volt transformers. The HV plate supply is 220V, and the rest is 120V. I
will
> be keying the plate supply. My 220V outlet has phase, phase, and ground.
> There is NO neutral. The outlet is not a GFCI outlet so ground current
will
> work, BUT.
>
>   The BUT here is whether this is legal with the National Electric Code?
> Before you say NO, consider the electric clothes dryer. These all run off
> 220V, and have 3 prong power cords. I have heard that in some dryers there
> are 120 volt loads (lights, and timer) as well as 220V (heater and motor).
> If this is true, then my approach must be OK so long as my power switch
uses
> a DPST switch and (double fuses)to insure everything is off when it is in
> the OFF position.
>
> Comments please...
>
> BTW, I do have a 240/120 autotransformer of suitable size (VA rating), but
> space does not permit it's use.
>
> Jim
> JKO
> --
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