Intruder EN Grade Three
Detection
DC Door Contact (Grade 3)
AM PIR Passive Infra Red Movement Detector, with Anti-mask Capability (Grade 3)
AM DT Dual Technology Movement Detector, with Anti-mask Capability (Grade 3)
BG Break Glass Detector
For a Grade 3 System, Grade 3 type Anti-mask detectors are 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 an entry (unconfirmed) Alarm is notified to the ARC.
Notification (Sounders and Signalling)
Grade 3 Systems would normally provide an ATS (preferably Dual path) with at least 1 self powered audible WD (SAB/SCB), or 2 remotely powered WD's.
Power Supplies
Grade 3 systems require 24 hours standby when using a ‘Type A' PS.
This can be reduced to 12 hours, providing ‘mains failure' is individually notified to the ARC.
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)
