[Amps] power supply transformer

[Peter Chadwick]

Tom said:
>A neutral is not allowed to be connected to exposed chassis 
or to the safety ground anyplace except at the mains panel.<
That's the case in the UK, too. The problem comes when you connect your external RF ground to the mains ground - in the event of a ruptured neutral, you can get the load current flowing (or attempting to flow) down your RF ground. Different countries have different approaches on wiring, especially in Europe. The UK uses a ring main system, which is why we need fused plugs - the spur system used in much of Europe can be protected by a breaker for each spur..
The GFCI or RCD (Residual Current Device) as we know it, are have the potential of being something of a pain, in that they trip from RF and from the effects of the variable frequency 3 phase inverter used for driving my lathe when it injects DC for motor braking. I have to have a 100mA RCD to avoid that problem, and as far as safety is concerned, that's about as much use as teats on a bull!
73
Peter G3RZP