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GB 50116-2013 第3.2.2条 Code for Design of Automatic Fire Alarm Systems

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GB 50116-2013 第3.2.2条

| When fire control, communication and alarm circuits are concealed, they shall be run in metal conduits or flame-retardant rigid plastic conduits and embedded within non-combustible structural layers, with a protective cover thickness of not less than 30 mm; when surface-mounted, they shall be run in metal conduits or metal trunking with fire protection measures taken.

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