Jim,
I've been engineering electrical systems since 1962. You are wrong. He
must ground the tap where he gets the "neutral" and provide some type of
fuse or circuit breaker protection on the "hot". Otherwise, if he
accidentally gets the hot grounded to something, there will be an arc until
someone runs to shut off the power to the transformer...it won't trip til
someone is fried.
Wouldn't want that on my conscience!
Ron, KE5QDA
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Jim Brown
Sent: Tuesday, June 01, 2010 1:36 PM
To: AMPS List
Subject: Re: [Amps] Bridging 120v loads across HV primary windings
On Sun, 30 May 2010 14:34:35 -0400, Martin Flynn wrote:
>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"
Your licensed master electrican was WRONG. It is entirely legal, and
entirely proper from an engineering point of view to place a 120V load
across half of a center tapped transformer as long as that load is center
tap is not grounded.
73,
Jim Brown K9YC
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