Lighting protection tube
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For factory lighting wiring protection tubes, additional protection tubes are required when they pass through walls, floor slabs, etc. Which standard specifies this? I’m busy and lazy; please give me some guidance.
In accordance with GB50303-2002, protective measures shall be taken for the section of insulated conduits that emerges from the ground or floor slabs and is susceptible to mechanical damage.
The specifications for electrical installation cover this
14.2.9 2. For rigid insulated conduits buried directly in the ground or within floor slabs, protective measures shall be taken for the section that emerges above the ground or floor slab and is susceptible to mechanical damage. You are truly amazing; I admire you! :handshake
I also have the new guidelines; I’m too lazy to read them when I don’t need them. The Code for Acceptance of Construction Quality of Building Electrical Engineering GB50303-2002 has been upgraded to the Code for Acceptance of Construction Quality of Building Electrical Engineering GB 50303-2015. Old specification: 14.2.9 2. For rigidly insulated conduits that are buried directly underground or within floor slabs, protective measures must be taken in the section that emerges above the ground or floor slab and is susceptible to mechanical damage. The issue here is that rigidly insulated conduits, which I assume are plastic pipes, require protective measures such as the use of steel pipes ； If steel wire tubes are used, it’s not necessary! The GB 50303-2015 Code for Acceptance of Construction Quality of Building Electrical Engineering does not mention this matter.
For the 2015 version, please refer to entry 15.1.2.
15.1.2 Protective measures shall be taken at the points where plastic-sheathed wires are in close contact with or cross protective conductors or non-heating pipes, as well as at locations prone to mechanical damage such as those passing through beams, walls, and floor slabs. This only shows that a protective tube should be placed around the plastic-sheathed cable; it does not state that another separate protective tube is needed outside that one. It is better to follow what the old standards emphasize: 14.2.9 2. For rigidly insulated conduits that are buried directly in the ground or within floor slabs, protective measures should be taken in the section where they emerge above the ground or floor slabs and are thus susceptible to mechanical damage. It indicates that an additional protective tube is used outside the plastic protective tube.