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| 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.
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.
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.
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.
| 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) |
