Questions · Intruder detection
What are the security grades in UNE-EN 50131 (the Spanish adoption of the European intruder alarm standard)?
Four levels, from 1 to 4, describing what class of intruder the system is designed against. Grade 1 assumes an intruder with little knowledge and everyday tools; grade 2, someone with some knowledge and common tools, including some measuring instrument; grade 3, someone who knows how alarm systems work and brings tools and electronic equipment; and grade 4, someone with the means to plan in detail and even to substitute components.
The grade is not a label on the panel: it conditions the whole installation. It changes how many detections are needed before an alarm counts as confirmed, how often the transmission path is supervised, how long the battery has to hold without mains, whether detecting the masking of a detector is compulsory, what happens when someone cuts a cable and what gets logged about all of it.
And there is a parallel classification that always gets forgotten: the environmental class, which says what environment each piece of equipment is designed for — indoor, general indoor, sheltered outdoor or outdoor. A high-grade detector with an indoor environmental class, hung in a loading bay with draughts and temperature swings, meets nothing and gives trouble on top.
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