Item Subject: cc:Mail Text Fellow Professionals I have another question regarding class II equipment. My power supply intends to use a printed wiring spark-gap for transient/lightning protection. It's inherent design requirements are such that the air-gap spacing are less than those specified for double insulated (4mm). If the gap is increased to 4mm then this spark-gap will not work except at voltages too high to provide protection.
Is anyone familiar with exceptions to the clearance rules when using spark-gaps? I have heard that some European countries don't like using MOVs (an alternative to a spark-gap) but a spark-gap cannot fail in a short circuit like a MOV could. Best Regards, Hans Mellberg
