On Wed, 23 Apr 97 11:33:00 -0700, [email protected] wrote: >I have another question regarding class II equipment. My power supply >intends to use a printed wiring spark-gap for transient/lightning >protection. <snip> >Is anyone familiar with exceptions to the clearance rules when using >spark-gaps? If the traces do not meet the spacing requirements, doesn't that initiate 'abnormal' testing (open & short component leads) to verify safe operation? Some specs allow this, and some don't.
>... but a spark-gap cannot fail in a short circuit like a MOV could. Discrete spark gaps may not fail short circuit, but they can certainly act like one while in the arc mode. Holdover voltage on one 230V part was 135V - that causes a lot of current to flow with a low impedance source. Pat Lawler [email protected]
