Clearance and Creepage Rules for PCB Assembly

Electrical spacing rules become significant from a product safety perspective when the normal operating voltage is greater than 30VAC or 60VDC. It may come as a surprise that voltages above these levels are considered hazardous and that these designs are therefore considered high voltage.

Having designed a number of high voltage and mixed technology boards recently, I have had to research current standards, definitions, and methodologies used to implement high voltage spacing rules in confined spaces. I say spacing rules because, in addition to the normally-supplied “clearance rules,” there is another set of spacing rules that are just as important to follow for high voltage designs—namely, “creepage” rules.

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This link clearly explains the difference between both and also discusses few of the common rules for PCB designing.

Aniruddh

Ani-Lab

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