[Boatanchors] 120 - 240vac and output

[Gary Schafer]

I totally agree with you about your analyses of the transformer and 
related circuitry as far as voltage drop. Nicely done.
What I and others were saying was about the mains supply line drop.

The key word here is "EXAMPLES". All these voltage drop figures that are 
being thrown around are just examples. They could be anything. The 
EXAMPLES are just to show the relationship between the two different 
systems. Of course 10% voltage drop on the mains is excessive but the 10 
volt figure is a nice round number that is easily followed for an example.

But in reality it may not be far from the mark either. There are lots of 
people that plug their amp into any old outlet and try to run it without 
consideration of the adequacy of the supply line.

Designing 120 volt supply systems verses 240 systems could use the same 
size wire in either. It would not be uncommon to find a 120 volt outlet 
wired with #12 wire or a 240 volt outlet also wired with #12 wire. 
either circuit would be carried with a 20 amp breaker. Nothing wrong 
with either.
Only thing is that the differences in voltage drops that were being 
discussed come into play.

If you were specifically installing a line to run an amp of course 
consideration for exactly what the requirements were would be thought of 
I would think.

73
Gary  K4FMX


WA5CAB at cs.com wrote:
> Yes, but you don't do that, either legally or practically.  And my analysis 
> was an engineering one, assuming that the supply wiring was adequate to the 
> task.  You are assuming the opposite.  That the wiring is inadequate.  A 10% drop 
> in supply voltage with load due to drop in the supply wiring is obviously an 
> overload.  Anyone who would design such a system should be fired.  You don't 
> design 120 volt systems using the same load figures as for 240 volt ones.  Not 
> if you want to keep your job, or keep your house from burning.
> 
> As I said before, any transmitter or amplifier designed to run on 120/240 
> that won't deliver the same power on either is poorly designed.
> 
> In a message dated 11/26/2004 10:52:05 PM Central Standard Time, 
> garyschafer at comcast.net writes: 
> 
>>I don't think that most were thinking in terms of the transformer 
>>resistance. Mostly just the 120 or 240 volt house mains line delivering 
>>the primary power to the amp.
>>
>>Also I believe that most were using the same size wire for the mains 
>>whether it be 120 or 240 volts in the examples.
>>
> 
> 
> Robert Downs - Houston
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