On Oct 13, 2005, at 7:23 PM, Lon W. Cottingham wrote:
> The one that got me was the
> statement that 220 AC wiring should be larger than 110 AC wiring.
Certainly not true. If anything, the 220 wiring can be smaller.
Although, these days, I doubt anyone is seeing 220, more like 240.
> An SB-220 draws basically the same power from the AC mains
> when
> powered by either 110 AC or 220 AC.
However, with 110, the I^2R losses in the wiring are quadrupled.
> The only real consideration is whether
> your Ham Shack's (household wiring) 110 AC wiring can pass the
> required
> current to the amp with an acceptable voltage drop.
220 volt wiring will have half the drop with the same wiring, and
result in one quarter of the power lost.
> My Ham Shack wiring is all done with #10 wire.
...
> While I am not suggesting that you do it, small amps like
> the SB-220 simply do not present a problem when operated from an
> adequately
> designed 110 AC system.
Most residential wiring is done with either #14 or #12 wiring. (you
can tell by looking at the breakers) Your #10 wiring is unusual and
allows nearly 30 amps to be drawn through the circuit.
> However, a 220 AC circuit wired with #14 wire should be more than
> adequate
> to power an SB-220 (again, I am not suggesting that you do this).
Why not? #14 circuit is capable of 15 amps. At 220v, this is more
than 3300 watts. The fuses on the primaries in the SB-220 are, what?
10 amps each?
Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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