[Elecraft] 120V vs 240V

[Edward R. Cole]

I recently wired my ham shack for 240vac for supplying my 4500w HVPS 
that supplies HV for my 2m-8877 (full QRO).  I went to Home Depot and 
bought 150-feet of 8-4 cable (actually three #8 awg wires and one #10 
solid-conductor safety wire).  This runs from my service box to a 
small load center (40amp breaker box which I have equipped with a 
240-20A and two 120-20A breakers).  This does not exceed the 40amp 
rating of the box or wiring (35-foot run of 8-4).  I run all my shack 
power supplies from this source: HVPS on 240vac, 12v-50A PS and 
28v-25A PS.  The filament transformers and bias supplies.  This is 
grounded thru a second ground rod outside the shack as well as thru 
the 4th safety wire via the service ground.

This lessens the electrical loading on the 120v house circuits in the 
bedroom converted to shack.  Those circuits power the computer stuff, 
lights, antenna rotators, and some test equipment at the work bench, 
plus bench 0-30vdc power supply.

73, Ed - KL7UW


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Message: 44
Date: Tue, 15 Feb 2011 17:17:42 -0800 (PST)
From: ab2tc <ab2tc at arrl.net>
Subject: Re: [Elecraft] 120V vs 240V
To: elecraft at mailman.qth.net
Message-ID: <1297819062287-6030165.post at n2.nabble.com>
Content-Type: text/plain; charset=us-ascii


Hi all,

I was not advocating using the safety ground of the 240V cable for a neutral
return for a 120V outlet (clearly against code). I have not done a a
combined 120/240V run myself but I thought it was possible to get a complete
red/black/white/blank cable to do this in a single run. Rummaging around in
my supply of electrical wire I found a red/black/white piece of cable but
curiously it had no safety ground wire. Anyway, I suppose running two cables
from two breakers is still not too much trouble.

AB2TC - Knut




73, Ed - KL7UW, WD2XSH/45
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