[Amps] TL922 Power Plugs

[Carl]

Several commercial amps of the 60's, 70's and maybe later, including Alpha, 
Henry and Johnson connect the 120V devices between a 240V leg and ground. 
Apparently is was considered safe and legal back then when lawyers and 
nervous nellies werent running the country.

Im not saying it is recommended, just that it was once acceptable.

Carl
KM1H


----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <amps at contesting.com>
Sent: Tuesday, November 03, 2009 10:49 AM
Subject: Re: [Amps] TL922 Power Plugs


> On Thu, 29 Oct 2009 18:17:21 -0400, Ian Hill - K8MM wrote:
>
>>Houses are typically feed off of a center tapped secondary.  240V
>>measured between  phase conductors and 120V between either phase
>>conductor and the center tap.  There isn't any sort of dangerous  short
>>by having the neutral ( i.e. center tap) and the ground bonded together
>>in the primary distribution panel in a house....its supposed to be
>>connected that way.
>
> Exactly right. One other VERY important point -- it is both ILLEGAL and
> UNSAFE to connect neutral to ground at any other point. The proper
> connection of a 240V load is to the two ends of the transformer only,
> and with the ground wire connected for safety.
>
> There is some equipment that needs both 240V and 120V to operate. That
> equipment gets its 240V from the two ends of the transformer, and MUST
> get 120V between one side of the transformer and NEUTRAL, NOT GROUND.
>
> 73,
>
> Jim Brown K9YC
>
>
>
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