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alarm system aluminium battery bell braced door British Standards Institution caller casement fastener casement stay casement windows chip pan conduit connected consumer unit control unit cover cylinder deadbolt deadlocking door frame door is closed double-pole wiring drilled electrical ensure equipment fire fitted fixed ﬂames ﬂanges ﬂat ﬂoor ﬂush door foil four-core cable front door fuse fuseways hole householder inserted inside installed intruder junction box key is turned latch ledged and braced levers light locking bar locking devices magnetic contacts metal method mortise lock mortise rack-bolt muntins necessary nightlatch occupant operated padlocking bolt pin tumbler pin tumbler lock plate position possible precautions premises pressure mats prevent protected putty reed switch removed replace rim lock ring ring circuit sash windows sheet glass shown in Figure sliding patio doors sliding window smoke detectors staple steel surface-fitting terminals time-switch type of lock under-ﬂoor safes vertical wall safe window lock