Hello J�rgen,

> I am shure that the PCB design can blow 3x16 Amp fuses but I am not shure
> wether I can use the PCB to provide PE to the motor or I have to do the
> complete PE wiring outside the board. Any hints for rules, text, UL, EN,
> VDE ... ?

You have to consult the standards and regulations that are covering your 
application. For example in my field which is medical electronics these 
would be documents such as IEC601-1.

Usually there are some ground rules. One says that a connection for PE 
cannot at the same time be a structural support. As an example this 
means you can't use a screw that is also holding a panel or something 
else in place. Next, the PE usually must remain uncompromised if a part 
is removed. So if your PCB is removable that might be a concern.

Personally I would always make sure there is full PE protection outside 
the PCB.

Regards, Joerg

http://www.analogconsultants.com

maybe this question is a bit off topic here, but for a phase control
thyristor design I plan to use the Tyco Mate-N-Lok conntectors for a one hp
3 phase AC motor. These connectors have UL up to 600VAC and plugged only
without load. 

I am shure that the PCB design can blow 3x16 Amp fuses but I am not shure
wether I can use the PCB to provide PE to the motor or I have to do the
complete PE wiring outside the board. Any hints for rules, text, UL, EN,
VDE ... ?