Check the archives... this question has been asked 783,984,231,439 times,
and all the answers to this and every other house wiring question are there.
Sincerely,
Dr. William J. Schmidt, II K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC
Email: bill@wjschmidt.com
WebPage: www.wjschmidt.com
"It's not what you take with you... but what you leave behind that counts.
Live each day as if it were your last."
----- Original Message -----
From: "Keith Dutson" <kdutson@sbcglobal.net>
To: "'Bill Turner'" <dezrat1242@ispwest.com>; <amps@contesting.com>
Sent: Sunday, November 13, 2005 4:38 PM
Subject: Re: [Amps] Question about safety ground connection
> Bill,
>
> As you have noted, the standard 240V plug does not bring the safety ground
> to your chassis. However, you can wire the 240V circuit with safety
> ground
> (4th wire) and run a separate ground wire from the outlet to your chassis.
> I have never seen this done, however.
>
> The neutral wire begins at the transformer outside (center tap) and is
> grounded there by the power company. The breaker panel has a ground rod
> just below and should connect to neutral. The safety ground is an
> independent ground. It SHOULD be at the same potential as neutral. The
> main difference is the safety ground wire has no relationship to the hot
> wires, so current cannot flow from the transformer. The neutral wire
> current should also be zero but could provide a path for current should
> the
> two 120V phases not draw equal amounts of current. This is an abnormal
> condition.
>
> 73 Keith NM5G
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
> Behalf Of Bill Turner
> Sent: Sunday, November 13, 2005 12:35 PM
> To: amps@contesting.com
> Subject: [Amps] Question about safety ground connection
>
> I have a question about how to connect the safety ground from the AC
> mains.
>
> I'm building a 1500 watt amplifier with a separate power supply. The power
> supply will connect to a 120-0-120 wall socket. My question is whether the
> "0" pin is considered a safety ground pin or a neutral pin. If it's
> neutral,
> then do I have to run a separate safety ground wire back to the AC mains
> entrance? Conversely, if it's a safety ground pin, am I allowed to connect
> a
> 120 volt load (blower motor) from it to one of the 120 wires? I suspect
> not,
> so does this mean the 120 volt load will need its own separate 120v
> circuit
> (with its own ground), and is it ok to connect the two grounds together?
>
> Comments appreciated.
>
> 73, Bill W6WRT
>
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