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Intruder EN Grade Two


DCDoor Contact (Grade 2)
PIRPassive Infra Red Movement Detector (Grade 2)
DTDual Technology Movement Detector (Grade 2)
BGBreak Glass Detector

For a Grade 2 System, Anti-mask detectors are not a requirement.

DD243 still applies regarding overlapping coverage, so PIR coverage must not overlap.

It is acceptable for DT coverage to overlap with PIR or other DT’s.

Grade Two Example

Intruder Grade 2


A 45 second maximum entry timer is permitted, with a further fixed 30 second warning period, before Entry (unconfirmed) Alarm is notified to the ARC.

Notification (Sounders and Signalling)

Grade 2 Systems would normally provide an ATS with at least 1 self powered audible WD (SAB/SCB), or 2 remotely powered WD’s.

Power Supplies

Grade 2 Systems require 12 hours standby when using a ‘Type A’ PS.


ACEAncillary Control Equipment(eg Exit Terminator Switch)
PACEPortable Ancillary Control Equipment(eg Remote Keyfob)
CIEControl and Indicating Equipment(eg Alarm Panel)
WDWarning Device(eg Bell Box, Sounders, Strobes)
ATSAlarm Transmission System(Signalling System)
ARCAlarm Receiving Centre(Monitoring Station)
PSPower Supply(Power Supply for I & HAS)