Dave,
When a building is struck by lightning, long runs of wires in
the building like Alarms and Computer networks, receive an induced
high voltage. Some circuits use a spark gap. The gap can be a simple
gap to ground or a solid state device. The old devices looked like
tubes. My guess is the are spark gaps....then again they could be
test points.
John
--- In
Homebrew_PCBs@yahoogroups.com, "Dave Mucha" <dave_mucha@y...>
wrote:
> Hi all,
>
> I have been looking at some board from some other stuff, laser jets
> I've pulled apart and alarm panels and stuff, and I have seen more
> than a few sections near terminal connections that look like
> triangles in a row, and a mirror image so the very tips of the
> triangles seem to touch.
>
> any idea why ?
> and is one does them (for the reason in the response) is there a
real
> need for them ?
>
> Dave