DD243 is a Code of Practice for the installation and configuration of intruder alarm systems designed to generate confirmed alarms. This Code of Practice supplements PD6662 and EN50131.

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DD243 was originally introduced in 2002 to reduce false alarms during setting/ unsetting and to improve the operation of alarm confirmation. It applies to all new systems incorporating confirmed alarm technology and to existing systems, which are off Police response and are being upgraded to confirmed alarm technology to re-gain response. 

Personal attack (hold-up) alarms whether they are stand-alone or part of an intruder alarm system are not affected by this Draft for Development.

How does Draft for Development (DD) DD243 affect your intruder alarm system? 

Currently most systems are unset at a keypad during an entry time that starts as you enter the door to the premises. If you use this method under this draft for development all alarm confirmation has to be turned off when the door opens ((c) below), however, this means that a break-in through the entry door cannot be passed for police response and is generally unacceptable to Insurance Companies. We therefore recommend Option (d) below.

DD243 allows five un-setting methods:
a) System un-set by unlocking the initial entry door.
b) Unlocking entry door disables all confirmation then system un-set internally.
c) Opening entry door disables confirmation (not acceptable to most insurers).
d) System is unset using a proximity fob – our recommendation
e) Un-setting carried out in conjunction with the Alarm Receiving Centre. 

DD243 allows five methods to complete the setting of your system:
a) Key operated shunt lock on final exit door
b) Push button outside the premises
c) Door contact on the final exit door
d) Proximity fob (as unsetting (d) above) – our recommendation
e) In conjunction with the Alarm Receiving Centre 

For both un-setting and setting your system we recommend option (d) - using a proximity fob with a system keypad incorporating a proximity reader located just inside the entry/exit door. This provides a simple operation for keyholders and eliminates many alarms caused by entering incorrect user codes.