HF-filters - that's Y they are called Why-capacitors

       

Neutral conductor currents are the one concern filters like this one raise - reliability and availability are the other. This filter, though rather old, looks very sturdy and solidly made. It used to do service in a washing machine for many years, then spent several years in a drawer. Now we put it to a test, just with normal operating voltage and frequency and with the foreseen wiring with the protective conductor of the mains connected to its PE connection. So let's wait until next week to see what will happen.