IEC 61000-4-2: Requirements for coating declared as insulating

#1
Hi everyone,

IEC 61000-4-2 contains a statement regarding painted surfaces, "Coating declared as insulating by the manufacturer shall only be
submitted to the air discharge. The contact discharge test shall not be applied to such surfaces."
Is there any reference to the insulating coating characteristics like min impedance, coating type, thickness, etc?

All the best,
Meir
 
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Benjamin Weber

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#3
Hey Meir,

IEC 60601-1 has some notes regarding coatings as insulation, but no particular requirements. You chould consider the coating as solid insulation. The corresponding requirements should then be identified from the relevant standard sections.

To be honest, I think such a coating can be used as solid insulation, but it may be difficult to specify it as a means of protection against electric shock. In this case there might be requirements, the coating maybe could not fulfill, e.g. mechanical strength tests (impact test!) and maybe also minimum thickness of 0,4mm if the working voltage is above 70V!

So be careful, how you specify the coating!

And even if you specifiy it "only" to comply with EMC requirements. Does your device implement any critical functions maybe even essential performance? If yes: You should evaluate how reliable the coating is over the whole expected lifetime of your device. If the coating degrades over time or might be damaged due to external influences (e.g. mechanical hazards), than the contact discharge on the uncoated surface is maybe more relevant! Your device should pass the ESD tests in this as well.
 
#4
Thank you Benjamin.
I'm aware of the need to ensure esential performance over expected lifetime of out product.
I was looking for someone with practical experience who could share data on existing coating technologies and durability over time and use.
 
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