High voltage PCB trace separation

[themaccabee]

Hi,

I 've got a PCB in which 85V is being generated.
I would like to know how much minimum trace separation needs to be maintained between this 85V trace & other traces (say GND).
(The current rating of this 85V supply is 50mA only)
Thanks ,
Regards

 

[nelsonys]

It depends on the standard that you are complying. For eg. IPC2221 or UL standard.
Besides is this a product? Or your own hobby circuit?

If it is just for normal use, 1-2mm would be suffice for creepage distance. In fact, 2mm is a bit harsh already.

 

[mayank.bhaintwal]

current rating is very small.u hav to give thick plane 4 power signals with minimum .1mm nd max .5 mm spacing is sufficient.

 

[nelsonys]

I guess current has nothing to do with clearance.

We decide trace width according to current, and clearance or creepage according to voltage.

 

[andre_luis]

The bandwidth of signal also must be considered.
Higher frequencies components of signal can propagate in dielectric air more easilly.

+++