I think you have to ask the manufacturer of the capacitors about the
insulation quality of the coating, and also test what happens if the
insulation does break down; the result might be 'safe' but destructive.
At that point, high-voltage spikes on the AC input have to be taken into
account. It looks as though changing the PCB would be a simpler solution
than trying to prove that it's already OK or than adding a piece of
insulating material and checking that it is still there.
On 2024-03-11 17:13, James Pawson (U3C) wrote:
Hello Group,
We are assessing a system that uses class Y1 capacitors for EMC
filtering. Because of space constraints, they are laid down
horizontally on the PCB.
This is causing a problem (at least in my mind) where the capacitor
body is now resting on top of the AC input trace. The side of the
capacitor connected to PE is the side closest to the AC mains input trace.
jpg icon y-cap-body-insulation-question.jpg
<https://unit3compliancecouk-my.sharepoint.com/:i:/g/personal/james_unit3compliance_co_uk/EaXJSK9bMYRItCXbdutLJKsBORjTOA5_7Kh0bpPXDC5taw?e=aT7pfK>
One of those pieces of received wisdom that has been passed down to me
is that “the body of components is not considered to be insulating”
for the purposes of assessing creepage and clearance.
Common sense says “danger danger Will Robinson” and to change the PCB
and/or to add some insulating material, but some technical back up
would be welcome.
All the best
James
James Pawson
Managing Director & EMC Problem Solver
*Unit 3 Compliance Ltd*
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