Mark,

The AC portion of these type ADAPTERS is
only the primary windings of the transformer coil.
There are no "active" AC components so the device
does not require polarization.

Jim Meagher

----- Original Message -----
From: "Mark Rode" <[log in to unmask]>


> 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 ?

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