NFPA 72 火灾报警规范
日期:2012-02-08 16:52
for two-way emergency communications systems
Other major revisions and additions that increase protection affect
Circuits and pathways -- A new chapter combines existing and new requirements and consolidates basic wiring rules and circuit performance into one location.
Voice intelligibility -- Revised installation and testing provisions plus an extensive new Annex with detailed guidance for testing
Signaling for the deaf and hard of hearing -- Improved safety in sleeping areas includes new
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09/11 23:33