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Re: 120 vs 240

Posted by P.B. Christensen on Jan 25, 2011; 6:08pm
URL: http://elecraft.85.s1.nabble.com/120-vs-240-tp5959816p5959874.html

> We do this all the time with portable heaters, window
> AC units (about 8 amps) etc.

The quality of the 120V run makes a big difference.  For example, if it's a
15A branch circuit feeding multiple outlets across several rooms -- and if
wiring is formed with pressure-contact receptacles, -- and the receptacle
you need is on the end of the string, don't count on a stiff supply.

By contrast, if a dedicated 20A branch circuit is run only to the shack,
uses clamp terminals, and the feed is shared between the amp and a few
low-current devices, then output power should be more predictable with
minimal voltage sag at the 500W level.

Anyone considering a new 120V circuit to the shack to avoid these problems
(in my case it was dimming lights) may want to consider pulling a companion
4-wire 240V circuit to handle all commercial amps, new and old.

Paul, W9AC

 

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