Hi Group,

I have one of those scenarios where EMC meets product safety.
For the purpose of RFI, I have a requirement to connect RF bypass 
capacitors from the input lines of a Low voltage DC (30V max, SELV) 
piece of equipment to PE. As I recall when I worked in ac voltage 
converters, we used to connect Y-rated capacitors between phase 
and PE. 

Is it still a requirement that I need a Y-rated capacitor for this LV product
or can I get away with a much smaller capacitor with a varistor in parallel?

All comments welcome. I trust the wording is clear but please let me know 
if a sketch in word is required.

Thanx in advance.

Regards

- Chris





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