Mains filters? (But used on the secondary)

[Paul Perry]

At 01:46 PM 31/05/99 +0900, The Dark force of dance" <batzman wrote:

>What I'm wondering is if it would be feasible to place a line filter on the
>secondary of the transformer as opposed to the primary side. Sure the
>filter characteristics would be different but if my reasoning is correct,
>they should be only more effective not less.
>
Ho yes Batz, but it will do nothing to protect your mains transformer!
Stop being cheap and get a rectifier/truck battery/sine convertor from
your scrapyard mates ;-)

A more serious reply is that mains protection devices and filters are specced 
separately for the "common" spike on the 2 mains wires, and spikes from one
or both of these with respect to earth.

paul perry melbourne australia