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PCB Creepage and Air Clearance on 8 Layer Boards

N

Nissim Shaked

Shaked
#1
#1
We have a 8 layers board.
one of our inner layers is getting two power plane shapes -12v and +12v with a distance of 0.4mm between the shapes.
Are the Creepage and the air clearance defined for all layers of the board stack up or only for TOP and BOTTOM ? If the board passes Dialectic strength safety stress and still has 0.4mm shape to shape distance is it valid?
 
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G

Gert Sorensen

#3
#3
Another bump!

It has been a holiday season, but can someone help now that it is over?

Thank you very much!!
 
P

Pads38

Moderator
#4
#4
Hi Nissim,

Sorry I missed this thread up till now.
(It may get more response in the IEC 60601 forum).

Your 0.4mm may be OK. (see clause 8.8.2a) If it forms a "Means of Protection" it would need to pass the appropriate dielectric strength test. And also, the it is considered to be insulation through a "cemented joint" which brings clause 8.9.3 into play (thermal cycling, humidity conditioning and more).

I found a presentation by UL that covers the test requirements for inside PCBs. it refers to IEC 60950 (the IT standard) but these requirements are now the same as in 60601.

(Thanks Mods for moving this thread)
 

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