When i remove the cover from my alarm panel it tampers and turning the key to reset silences it, and acts like an engineers mode. If i remove the cover from the bellbox while in this 'engineers mode' will the bell ring, or does it have to recieve a trigger from the control panel. It is a SAB type, when u remove the hold and 12v supply it goes off, using internal batteries. Not particulary enjoying climbing ladders, I would prefer not to be suddenly standing next a 110 dB siren while its active. The bellbox is quite old and there is a chance that its rusted shut, would a crowbar be easier!?

There`s every chance that as soon as you remove the lid the bells will sound, as usually the hold off is passed through a tamper spring or switch that is closed when the lid is pressed against it, or the retaining screw is unscrewed.

Crowbar and wire cutters it is then

Thanks for all your help. Congratulation on an excellent site

"Crowbar and wire cutters it is then"

Battery drill & fire extuingusher please.......... Use a little class