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Re: [Amps] Safety grounding - was Mains Isolation Transformer

To: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] Safety grounding - was Mains Isolation Transformer
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Mon, 03 Jul 2006 14:43:04 -0700
List-post: <mailto:amps@contesting.com>
>4-wire 240v circuits.

A 4-wire 240V circuit requires a 4-contact appliance connector of 
some sort, not a conventional 3-contact 240V outlet, because the 
conventional 240V outlet bonds the third pin (the round pin) to the 
backbox, which grounds it (if the backbox is grounded, which it is 
required to be). 

In the 4-conductor connector, two contacts are the "hots" (that is, 
each is 120 either side of neutral), one is neutral, and the fourth 
must be a green equipment ground wire that bonds the equipment 
enclosure and backbox. That is the only way to legally (and safely) 
use a 4-wire 240/120 volt circuit.

73, 

Jim K9YC 





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