So an update...
I went to a ham fair on the weekend and picked up a brand new Microset HSB-135:
http://www.microset.net/products/alimentatori/al20/al20en.htmlThis is an industrial Switcher for Radio and Telecoms use and has a nice built in 12v UPS system if I use a battery.
Well it seems to work great and can't detect any noise on HF, however I was curious about something...
I popped the cover off and noticed that the IEC Mains input socket Earth terminal is not connected to anything, the chassis earth is connected across X or Y caps across the AC input.
It is all CE marked, why have they not connected and earth from the IEC mains input socket?
Also next to the DC output sockets there is a terminal with a Ground/Earth symbol on it, they make no mention of it in the manual and this connects directly to the chassis inside.
Why is this like it? Is it an isolated ground/earth but will have a small current of high voltage on it from the X/Y caps? Or is it meant to be electrically earthed?
I was going to put a female spade inside on the IEC earth pin and tie it to the chassis, is this a good or bad idea?