Tony,
While it is possible and safe to use only two wires plug safety ground
(Green Wire Ground) for a 240 volt receptacle or 240 volt only device
(in-home air conditioner, dryer, etc), it is quite unsafe to split off
for a 120 volt supply using one hot and ground - in that case (such as a
range that has a 120 volt outlet on it or a 120 volt fan) you MUST run 3
conductors plus ground.
The ground wire should never carry current.
An inspector would never approve it, and if you value your insurance
coverage, don't try it - it will be found after the fire!
73,
Don W3FPR
On 7/10/2018 7:06 AM, N2TK, Tony wrote:
I do not understand the need for three wires plus ground. For a clothes dryer
outlet a neutral is required to get 110VAC from one of the phases to the
neutral. But for amps you only need both phases and a ground. The plugs are
three wire, not four.
73,
N2TK, Tony
-----Original Message-----
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Jim Brown
Sent: Monday, July 09, 2018 8:40 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] Breakers for KPA1500?
On 7/9/2018 12:26 PM, Bob McGraw K4TAX wrote:
I would also suggest using three - #10 with ground as the line from
the breakers to the amp operating position.
Not only a suggestion -- it's the law! Electrical Codes carry the force of law,
and they require that the equipment ground must 1) run with the current
carrying conductors and 2) must be no smaller than the largest conductor.
73, Jim K9YC
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