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Thanks that article was helpful. The existing box takes power from the battery (SCB) so I guess I could set the 2nd box to SAB. What I am really wondering is how the alarm bell box 'knows' it is in engineer mode... For example if I remove the TR wire or the hold off - wire from the existing...

Hi there, Just newly joined the forum here as was browsing some of the forums and wondered if anybody could help with a small query: I need to increase the security of my ground floor flat and have decided that it would be a good idea to add an additional bell-box to the alarm system that...