[Amps] Bridging 120v loads across HV primary windings

[James Colville]

The reason I had to use a 240 to 120 step down transformer was that my plate
transformer had no 120 volt winding. Just a 240 volt primary.

73
Jim W7RY



On Tue, Jun 1, 2010 at 5:16 PM, Paul Decker <kg7hf at comcast.net> wrote:

>
>
> I'm not sure that is exactly right.  I think what is being said is hanging
> the 120 VAC loads across half the primary.  In essence, the primary winding
> consists of two individual windings which can be placed in series to provide
> a 240 VAC primary, or in parallel to provide a 120 VAC primary at twice the
> current.  When configured in series as 240 VAC, the voltage at the center
> tap of the primary would be 120 VAC.  I don't see any safety issue with this
> configuration as the 120 load is not using the "ground" wire as a return
> path.
>
>
>
> What is the rub?
>
>
>
> Paul Decker (KG7HF)
>
>
> Message: 5
> Date: Sun, 30 May 2010 14:34:35 -0400
> From: Martin Flynn < maflynn @ theflynn .org >
> Subject: Re: [Amps] Bridging 120v loads across HV primary windings
> To: Vic K2VCO < vic @ rakefet .com >, AMPS List < amps at contesting.com >
> Message-ID: < 4C02AFBB.6050502@ theflynn .org >
> Content-Type: text/plain; charset =ISO-8859-1; format=flowed
>
> Vic,
> Run the 4 wire circuit and call it a day.    I ran this very issue by a
> licensed master electrician on Friday.
>
> Direct quote: "If any portion of the load is 120 volt, you need a
> neutral.  If you are hell-bent on a 2 wire + ground supply, get a 208
> volt fan and appropriately tapped transformer"
>
> Martin
> w2rwj
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