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Protection Earth over PCB

Started by Jürgen Veith July 18, 2005
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 ... ?


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