I think what Rich means is 8-3 or 6-3. Either is overkill unless you have an
extremely long run. But to be safe you might want to consider 8-3 over 10-3.
Myself I would go with the 10-3, more than enough. Also remember that your
240 ground and the 120 neutral are usually attached to the same grounded bus
bar. If you really want to play it safe, make the ground on the 240 a
dedicated ground, which is attached to its own bus bar that is grounded and
should also be attached to its own ground rod.
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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