This Technical Specification provides for security grades 1 to 4 (see EN 50131-1), specific or nonspecific
wired or wire-free detectors, and uses environmental classes I to III (see EN 50130-5).
A function designated in the specification as not required for a particular grade may be provided
by the manufacturer. If provided, it will be tested, and shall meet all relevant requirements of any
higher grade. If it passes, the manufacturer may claim it as an extra feature, which does not alter
the overall grading of the detector.
The specification does not apply to system interconnections.