Larry,

Some things to consider are:
1.) Thickness/gap of the traces, your conductor width is driven by current, the gap by the voltage.
2.) Filling vias. If you have high current with your voltage you may have to fill large diameter vias with solder.
3.) External covering of the board. Is it just solder mask or are you conformally coating the board?
4.) AC or DC voltage noise. If the high voltage trace is generating alot of noise you will need to shield it.
5.) You shouldn't have to use different substrate unless you want to heat up the trace by using a small width.

Good luck,
Randy McHugh

-- >>  Anyone out there have any experience with 500 volts on a printed circuit
-- >>  board?  What design considerations have to be considered?  Different
-- >>  board
-- >>  materials?  Looking for some guidance or references.

-- >>  Larry L. Pucket
-- >>  [log in to unmask]

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Randy McHugh      
Optimum Design Inc   
266 Corporate Dr    
Madison, WI 53714    
Voice: (608)243-9418   
Fax: (608)243-9420    
Email: [log in to unmask]  

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