Siemens lethal RCD



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English: Testing this RCD on 4,7k? resistor (when I wanted to do photo showing how does it work), I've found, that resistor still warm but this RCD doesn't trip at all. I pushed "test" button and it disenergized circuit. One more time I shorted cicuit to the ground, but it hadn't triped at all. OK, I decided to find out, what's wrong here. Imagine, how I was surprised, when have found out, that testing resistor has improper value and giving improper results. Especially instruction "test half yearly" surprised me.
  • Well, Siemens produced protective appliance, which material of cover and dimensions satisfy European standarts. But it doesn't protect human against lethal shock when it will be need. Important mission of this device is lost.
  • Who hadn't understood: pushing "TEST" button RCD will trip even if it is broken. Resistor overlimits leakage current 6.5 times, so result of testing will be wrong. If this RCD (which is created to protect people against electric shock) doesn't work correct, "TEST" button will always show that RCD working properly. As result, someone may be harmed by electric shock according to spurious result of the test, which has formed during tests.
    • To check those RCDs I recommend to use professional testing device, which you can find in electrical storey. It looks like power strip with lights and buttons. You put it into the socket and push "TEST" button, which will make 30mA of leakage and test your RCD. If you have any doubts, you may always check it using multimeter.
Date 10 December 2010(2010-12-10)
Source Own work
Author Dmitry G
(Reusing this file)
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