This was as problem in one of the early 1870's handbooks. In one of their
amplifier projects they showed a three wire 220 circuit, with no neutral.
and they had a blower connected across one leg to ground. What that does is
cause current to flow on the ground leg . Not good!
I wrote to the technical editor about it - next version of the handbook came
out with a 4 wire 220 circuit!
73, Wayne N1WR
P.S. Thsat 6 X 3-500z amp would be a real killer on Topband. Even with
> -----Original Message-----
> From: email@example.com [mailto:firstname.lastname@example.org]
> On Behalf Of Al Kozakiewicz
> Sent: Tuesday, February 14, 2012 11:08 AM
> To: TexasRF@aol.com; email@example.com; firstname.lastname@example.org;
> Cc: email@example.com
> Subject: Re: [Amps] Source for plate xfrmer
> First off, NEC codes end at the outlet. An amp is an "appliance" and
> would be covered by UL, which is entirely optional. There is nothing
> that forbids such a practice - an electric range is a good example as
> the overn elements are typically 240v, while the burners, controls and
> lamps are 120v.
> The issue is that a range uses a 4 prong outlet - 2 x hot, neutral and
> ground, while your typical amp/AC outlet is missing the neutral. You
> may NOT connect your fan between a hot and the chassis ground, even
> though it would be electrically rational. If the safety ground failed,
> the chassis would then be at 120v with respect to ground.
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