On Mon, 11 Nov 2019 12:27:56 +0000, Jeff Layman
wrote:

On 11/11/19 11:47, Peter Parry wrote:

These are not really type or manufacturer specific except for how some
make the earth connect to the machine. Some do it via a flying lead
and Lucar connector, others do it by a bolt through a small mounting
plate. They are not an item which fails frequently.

Maybe not, but evidently they can go with a bang according to some
reviews I have seen!

Y or X/Y class capacitors (used in the filter for line to earth
filitering) are required to fail open circuit so there is no chance of
them creating a live-earth path. X rated capacitors As they are in a
sealed aluminium or plastic can the gasses produced by some failure
modes can cause the case to rupture with interesting sound effects. X
rated capacitors must not support combustion so there in no fire risk
even if they make smoke.