(1) the metal wire slot wiring is suitable for indoor drying in normal environment, and is not easy to be damaged by mechanical application. But it is not suitable for places where serious corrosion occurs in metal wire groove.
(2) all the lines and neutral lines of the same loop should be laid in the same metal line slot. The same path without interference requirements can be laid in the same metal wire slot. The total section (including the outer sheath) of wire or cable should not exceed 20% of the inner section of the wire slot, and the current carrying conductor should not exceed 30. The total cut down of the wire or cable should exceed 50% of the cross section of the line slot and the lower limit of the number of wires or cables.
(3) when the metal groove is installed vertically or tilted, the Ji'nan cable bridge should take measures to prevent the wire or cable from moving in the online slot.
(4) lines drawn from wire grooves can be wired with metal tubes, hard plastic tubes, semi hard plastic pipes, metal hoses or cables. The wire or cable shall not be damaged in the elicited part.
(5) the line grains should be smooth and undistorted, and the inner wall should be smooth and without burr.
(6) metal wire grooves should be reliably grounded or zero, but should not be used as grounding conductors of the equipment.
2. Cable bridge cabling
(1) when cable bridge cabling is used indoors, the cable shall not have jute or other easy - to - burn material outer protective layer.
(2) when wiring cabling is used in corrosive or especially wet places, corresponding protective measures should be taken according to the different corrosive media, and plastic sheathed cables should be chosen.
(3) the height of the ground when the cable tray is installed horizontally is generally not lower than 2.50M. When the vertical installation is below 1.80m, the metal cover should be added to the protection, but it should be excluded when it is laid in the electrical special room (such as distribution room, electrical shaft, technology level, etc.).
(4) when the cable bridge is installed horizontally, the best span should be selected according to the load curve, and the span is generally 1.5 ~ 3M. The spacing of the fixed point should not be greater than 2m when vertical laying.
(5) when several groups of cable bridges are installed at the same height, the distance between the adjacent cables should be considered for maintenance and maintenance.
(6) the cable can be laid on the cable bridge without a distance, and the cable is transected in the bridge.
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