Spacing between split planes

[arunmaran10]

I have four split planes in Power layer which will carry 40Amps each.
Is it better i should go 25mils spacing or more than this is required between planes?

 

[kabaleevisu]

hi arun
better keep 100mil it is good

 

[marce]

Spacing is only for voltage and on inner layers is 0.25mm for up to 500V. It all depends on the design and complexity, and as Kabaleevisu has said more is better if the design allows. For a complex digital board with numerous voltage planes you have to use the minimum spacing to get the power distributed, on a Power board design the components are larger and generally spacing is less restrictive so a larger gap is used (as is also heavier base copper weight).
What sort of design is it?

 

[jayakrishnanj]

Only split plane (copper) area should be more for high current not the clearance, so 25 mils clearance between planes is ok, only high voltage need more clearance to avoid arc effect.

Thanks,
Jay

 

[marce]

You don't get arcing on inner layers until very high voltages.