[AMRadio] 220 volt AC Power Question


Darrell, WA5VGO hbrnut at earthlink.net
Mon Oct 30 20:40:05 EST 2006


This does not meet the code. A ground wire can never be used to carry load. 
Also, your ground wire is probably bare. A neutral conductor must be insulated.

Darrell, WA5VGO




At 07:09 PM 10/30/2006 -0600, you wrote:


>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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