PCB gaps (with or without slot) are okay for low-current
discharges. For high-current discharges such as occur
on mains circuits, the current will vaporize the copper
and increase the clearance distance, and thereby increase
the breakdown voltage with each overvoltage event.
Rich
On 9/6/2013 10:08 AM, John Woodgate wrote:
In message <F5B74858AAFC4C929D1E6F81869E1EA0@ComputerNo11>, dated Fri,
6 Sep 2013, Doug Powell <doug...@gmail.com> writes:
Best to simply use a glass or ceramic spark gaps which are inorganic
and cannot produce carbon when arced
You are right: using PCB tracks is to invite tracking! A slot in the
board with electrodes on both sides is better. These were used on CRT
base PCBs for many years with no significant problems.
-
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