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[AMPS] 240VAC Amplifier Wiring

To: <amps@contesting.com>
Subject: [AMPS] 240VAC Amplifier Wiring
From: 2@vc.net (measures)
Date: Wed, 15 Nov 2000 04:38:01 -0800
>
>I think what Rich means is 8-3 or 6-3. Either is overkill unless you have an
>extremely long run. 

When one uses a resonant-choke filtered supply, I agree.  With a 
capacitor filter, the peak current is 10x higher.  This is a whole nuther 
ball game.  When I used to tune up the Plywood Box with a 30pps tuning 
pulser, my wife could hear the #4 copper vibrating in the attic.  My 
neighbor told Edison that his porch light blinked.   When I first fired 
up the Plywood Box, I had an additional 1000v of anode supply drop 
because I used code-approved #6 copper.  #4 copper was the fix.  

> But to be safe you might want to consider 8-3 over 10-3.

This is hardly a safety issue. 

 cheers, Ed W3NR
>
>-----Original Message-----
>From: measures <2@vc.net>
>To: Eric Moore <emoore@windemullerelectric.com>; Paul Christensen
><paulc@mediaone.net>; AMPS <amps@contesting.com>
To: <amps@contesting.com>
>Date: Tuesday, November 14, 2000 6:34 PM
>Subject: Re: [AMPS] 240VAC Amplifier Wiring
>
>
>>
>>>
>>>Hello Paul,
>>>
>>>I am an Electrical Engineer for a large Electrical contractor in Michigan.
>>>We don't do much Residential, but I think I can help you out.  See
>comments
>>>interspersed below:
>>>
>>>>As I begin to add a 240VAC power drop to my radio shack at the new QTH, I
>>>>began to consider cable sizing, connectorization and grounding issues.
>At
>>>my >previous home, I used #10/3 CU cabling for a total distance of 60-feet
>>>to my >Alpha 77Dx (single tube).  I then terminated the drop into a
>Hubbell
>>>30-amp >Twist-Lock receptacle.  I then began thinking about various 240VAC
>>>distribution >possibilities:
>>>
>>>The 10/3 is fine if your circuit draws less than 30Amps.
>>
>>10-3 is not fine for capacitor filter supplies that draw an indicated
>>30a.  The problem is that peak current is 8 - 10 times higher than
>>indicated current.  My advice is to use 10-8 or even 10 - 6 for long
>>runs.
>>-  Rich..., 805.386.3734, www.vcnet.com/measures.
>>end
>>
>>
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>
>
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>
>


-  Rich..., 805.386.3734, www.vcnet.com/measures.  
end


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