The white wire in your electrical box should be the Neutral but you should
verify that you measure approx. 115-120VAC between the white wire and either
side of the 240VAC black and red wires. Finally, you should be able to
measure near zero ohms between the white wire and the bare ground wire since
the white neutral and bare ground should be tied together at just one spot:
the AC mains load center/breaker box..
The white wire in your box is only used when there's both a 120VAC circuit
(e.g., fan or blower) and a 240VAC circuit. Most amplifiers will not use
the white neutral lead. However, exceptions include the Alpha 70 and 77
series as well as some Henry amplifiers.
-Paul, W9AC
----- Original Message -----
From: <RadioMB@aol.com>
To: <amps@contesting.com>
Sent: Wednesday, May 04, 2005 12:06 AM
Subject: [Amps] 3 or 4 wire 240v for amp
> Hello,
> I have just moved to a new house in FL. I had a 240v line run to the ham
> shack. The box contains 4 wires. The normal red and black hot wires, a
> copper
> ground wire, and a fourth white wire. Is the white wire a neutral wire?
> Since my
> Drake L-7 has 3 wire cord (two hot and the ground wire). Do I now use the
> white neutral wire or the copper ground wire as the third wire in the line
> cord?
> When adding the new plug to the three wires from the Drake do I just not
> use
> the fourth wire? Does this meet code for a 4 wire system? Thanks for your
> replies, looking forward to using the L-7 again.
>
> 73 Mike WD5GLW
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> Amps@contesting.com
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>
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