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@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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