Intruder EN Grade Two
Detection
DC Door Contact (Grade 2)
PIR Passive Infra Red Movement Detector (Grade 2)
DT Dual Technology Movement Detector (Grade 2)
BG Break 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.
Entry
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.
Terminology
ACE Ancillary Control Equipment (eg Exit Terminator Switch)
PACE Portable Ancillary Control Equipment (eg Remote Keyfob)
CIE Control and Indicating Equipment (eg Alarm Panel)
WD Warning Device (eg Bell Box, Sounders, Strobes)
ATS Alarm Transmission System (Signalling System)
ARC Alarm Receiving Centre (Monitoring Station)
PS Power Supply (Power Supply for I & HAS)
