Re: [CAD_CAM_EDM_DRO] Re: Rewinding microwave transformers

In a message dated 13-Feb-02 12:15:17 Central Standard Time,
Gary.Rose@... writes:

> Now, 12 AWG wire is used for house wiring up to 20 amps. Why such a
> big discrepancy? I realize that you wouldn't want a transformer
> operating up to 90 deg. C (like house wiring is rated) but the results
> are still too far away to make sense.

Couple of reasons, but let's keep it simple: The "house wire" is strung out
in a line, so any heat will be unnoticeably-dissipated.

If wound up in a coil in a transformer, not only the current through the
copper, but the MAGNETIC stress contribute to heating. Besides, you don't
want the VOLTAGE-DROP you'd experience with "double" the current in the
winding. Third reason: Long years of experience by white-haired, bearded
old wizards that "do that"!


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