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gui chao cable news: discussion on fire protection design code for wire and cable
from：guichao author：admin click： 422 addtime：2017-03-21 09:00:58
(1) when the cable is laid in the vertical well, it is better to use the cable.
(2) wire and cable shall be made of metal pipe, metal wire slot or metal tray when laying on ceiling or floor.
when wires and cables are used to prevent the destruction of mice or small animals, and the floor is non combustible,
can be directly laid under the floor, laying should be arranged neatly, easy maintenance.
(3) when the wire is laid, the metal or metal wire grooves shall be used in the super grade and grade one places,
at the two stage, the metal tube or metal wire groove. pvc tubes in the fire will release a lot of toxic gases and smoke,
pvc should not be used when the tube, and upvc with flame retardant, and produce less toxic gases, so you can use.
(4) when the wire is laid down, the metal pipe or flame retardant rigid plastic pipe shall be used, and shall be laid in the non burning structure.
when the fire protection equipment is dark, the thickness of the protective layer shall not be less than 30mm.
(5) flame retardant wire and cable and flame retardant wire and cable can be laid in the same cable bridge.
because the refractory cable itself has the power to be maintained in the flame for a period of time, the utility model can be arranged in the same bridge.
(6) the power supply line of the two way to the fire fighting equipment can be laid in the same cable bridge.
(7) the cable laid in the same cable tray is easy to be isolated when the non-metallic material is more than 14l/m.
the most basic basis for the selection of the flame retardant cable level. according to the nature of the building,
as well as the degree of damage to life and property and the degree of difficulty in fighting the fire, the flame retardant rating of the cable used for different grades of buildings,
refer to the provisions of the shanghai on the "fire safety design code for civil building wires and cables" in the provisions of the flame retardant rating of cables.