Machine room trunking design
GB 7588-2003 "Safety Code for Elevator Manufacturing and Installation" and other requirements for the trunking are only: "The laying of the conduit and the trunking should be straight, tidy and firm. The total area of the conductors in the trunking is not greater than 60 of the net area of the slot. %; the total area of the wire inside the line pipe is not more than 40% of the net area inside the pipe; the fixed distance of the hose is not more than lm, and the fixed distance of the end is not more than 0.1m.) The design of the machine room trunk is mainly based on the above standard requirements, combined with the cable of the elevator machine room. The number of specifications, calculate the specifications of the trunking. But with this alone, it is impossible to design a specific plan. The following factors should also be considered in the actual design.
In order to prevent interference, the cable of the elevator machine room must be laid separately for the strong and weak electric cables, so that the strong and weak electric double-line slots should be designed. According to the number of specifications of the elevator strong and weak cable, calculate the size of the trunk according to the above standard requirements, and then leave a margin of 10% ~ 20% according to the actual experience. The wire trough can be laid in steel trough, PVC trough or grid trough, and can be laid overhead or buried. In actual installation, metal wire troughs are often used to lay on the ground of the machine room. Therefore, it must be considered that the strength of the trough should be sufficient to withstand the presence of people without deformation damage. Based on such considerations, the thickness of the selected metal wire trough is required to be greater than or equal to 1.5 mm.
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