VDE 0833-2. The components are largely harmonized in the EN 54 series of European standards. For example, EN 54-3 (audible signaling devices) and EN 54-23 (visual signaling devices) stipulate the requirements [...] describe the coverage volume in any way or to design the best possible coverage volume for specific applications and constructions. This is stated 1:1 in the new sub-item 6.4.8 in VDE 0833-2 (visual signaling [...] also requires the devices to deliver a specific light output and light distribution. For example, it specifies that throughout the coverage area a minimum light intensity of 0.4 lux/m² must be achieved under
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