On Tue, 2 Dec 2008 13:17:18 -0800 (PST), D7666
wrote:

On Nov 30, 4:47 am, Charles Ellson wrote:

relays drop out causing an alarm;

reset up to three times in
succession before someone is sent

Nope.

Well, it's been a few years since someone demonstrated the process to
me.

Respond at first alarm with an emergency fault. At least thats
how we do it on ''my'' bit of underground infrastructure.

The same procedure for both unreproducable trips and persistent trips?