>Your house wiring has surge supressors which attenuate PLC signals, touch
>sensitive lamps which attenuate these signals, cheap appliances with
>capacitor input power supplies which attenuate PLC signals (If you catch
the
>guy who designs these cheap appliances, take away his soldering iron!)

It's common requirement to have X2 capacitor on the power input line if
your appliance have motor inside.
The design will not pass UL or CE test if doesn't have such capacitor.

Best regards
Tsvetan
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PCB prototypes for $26 at http://run.to/pcb (http://www.olimex.com/pcb)
Development boards for PIC, AVR and MSP430 (http://www.olimex.com/dev)

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