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Re: [Amps] Amps Digest, Vol 110, Issue 30

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Subject: Re: [Amps] Amps Digest, Vol 110, Issue 30
From: "Wayne Rogers" <>
Date: Thu, 16 Feb 2012 13:57:13 -0500
List-post: <">>
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: []
> On Behalf Of Al Kozakiewicz
> Sent: Tuesday, February 14, 2012 11:08 AM
> To:;;;
> Cc:
> 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.
> Al

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