I already corrected myself - "neutral" should be "ground".
Al
AB2ZY
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of Jim Brown
Sent: Sunday, April 03, 2011 3:28 PM
To: amps@contesting.com
Subject: Re: [Amps] what is a 4 wire 240VAC service?
On 4/3/2011 12:08 PM, Al Kozakiewicz wrote:
> For amateur amplifiers that run ONLY on 240V, 4 wire service should not be
> required by code or UL. The neutral is only for safety and does not carry
> any current except in the case of a failure.
This is bass akwards. A power that runs on 240V MUST draw power between the
two sides of 240 volts. NO NEUTRAL CONNECTION IS NEEDED UNLESS that power amp
also needs power at 120V (typically to run a 120V fan). The ground (Green
wire) is the SAFETY ground, and must be connected only to the enclosure. The
primary of the power transformer MAY have a center tap, but it MUST NOT BE
GROUNDED. The center-tap COULD legally be connected to a neutral, but there is
no good reason to do so. Further, it is a SERIOUS violation of safety codes to
connect Neutral to ground, AND A CAUSE OF NOISE, HUM, AND RFI,
PLEASE study either NEC or my tutorial before you spread any more
misinformation.
73, Jim K9YC
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|