PCBs stack Insulating

They usually don't design stuff that's already broken.

Hope This Helps! Rich

Well, I just want to be sure that there is something between PCBs and not only air.

For example, if it falls the impact can cause a short.

I'm not sure what it is, but I've taken things apart and there's a sheet=20 of semi-clear something between switching supplies and the chassis. I=20 guess some kind of plastic, you just have to find out what's being used.

Michael

Yes, I have seen that too, but I would put some flame retardant, or add EMI sheets (expensive)

I have 16mm between PCBs, In spite of it I am sure that I can make it surer

Thank you

Sure, it's readily available. We also use a few mil thick sheets of lexan. You're probably going to want something that's UL 94V-0, or similar, rated.

Does it need UL or other test labs certification?

I've seen clear plastic that I understand to be polycarbonate (eg: Lexan(tm)) and also card-weight transformer paper (eg: Nomex(tm)) used as an insulator around mains voltages,

but for the application under discussion the FR4 sounds like a better solution as I expect it would be more resistant to puncture under physical shock and vibrations.

The cheap way is 'fish paper', a kind of dense paper like oaktag.

Is that 16mm correct? That is 0.629 inches, over 5/8s of an inch. I'm not sure you need anything, You might try a piece of soft rubber or firm foam in the center between the boards if it is a long span between standoffs.

Mikek

irm

s.

Yes that is correct 16mm, and I need UL certification.

Could you please tell me where I can find FR4/G10 without copper?

Thank you