At 06:19 PM 8/22/00 -0700, you wrote:
>120 >> 12 volt transformers for PC devices such as hubs, speakers and
>modems never have polarized plugs.
>However I have always made sure that the transformers are plugged in at the
>correct direction relative to the printing on the device so as to put the
>hot lead on the right. This is not always easy to arrange without loosing
>some outlets on a surge protector or UPS.
>
>Because the transformers never have polarized plugs I am not sure that this
>is in fact necessary ?
>Is this a good idea or does it matter ?

Not a EE here, but a CET.  Maybe half as many Es will do?

Not necessary unless the transformer is not isolated (Neutral of the
primary winding connected to one lead of the secondary).  I can't think of
any reason not to isolate the secondary.

So, I would suppose it doesn't matter.


J. Paul Jones
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