In this case, while the caps are across the ac line just like an X-cap, the
device is test equipment which only monitors the potential across the ac
input during EMI testing in an EMI test facility. I had suspected that the
difference between a cap rated for ac mains usage and one that wasn¹t was
Ken,
Even though they may have a DC rating that exceeds the AC Peak of the line.
There are more factors.
Line rated caps also have surge ratings, typically in the kV range. Derek
mentioned the X an Y series and surge is one of the main attributes of this
type. I once had an RF engineer con
HI Ken,
you don't say how small and it's relative you know :-)
Any cap I suggest for across the line use I strongly recommend it has an X
rating, a Y rating if it goes between power and earth.
Is this what you were meaning?
Cheers,
Derek.
-Original Message-
From: Ken Javor
To
Forum members,
Am trying to spec out some small value capacitors to be placed across
unrectified mains potentials. These caps are rated at dc potentials way
beyond the peak of the ac bus potential, but they carry no ac rating.
What are the issues here? The cap should not breakdown at ac mains
po
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