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Intruder EN Grade One

Grade 1 is the lowest EN grade alarm system and is typically installed on the basis that intruders are expected to have little knowledge of the alarm system and may be restricted to a limited range of easily available tools to disarm the system.

How does Terminology differ between BS and EN50131?

Some Terminology has changed, and some of the more common terms and abbreviations used in the standards are detailed below.

IASIntruder Alarm System(Type of System)
HASHold-up Alarm System(Type of System)
I&HASIntruder & Hold-up Alarm System(Type of System)
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)

Example IAS (Intruder Alarm System)

The diagram shows the terminology for the main components of a system.

Detectors are not shown in this example.

Intruder Grade 1