The difference between cable tray and cable trunking
◉ 1, size specifications are different. Bridge is relatively large (200 × 100 to 600 × 200), wire channel is relatively small. If there are more cables and wires, it is recommended to use the bridge.
◉ 2, the material thickness is different. According to JGJ16-2008-5.1 metal trunking, also known as slot bridge, generally from 0.4-1.5mm thick whole sheet steel bending and into the slot components, conceptually different from the bridge is high, wide ratio is different, plate rack shallow and wide, metal trunking is with a certain depth and closed. But the bridge is more sturdy than the wire channel, more used to put cable, of course, can also be put on the wire, usually strong power system with.
◉ 3, fill rate is different. According to JGJ16-20088.5.3, the total cross-section of wires and cables in the trunking should not exceed 20% of the cross-section in the trunking, current-carrying conductors not more than 30, while the bridge is the total cross-section of cables should not exceed 40% of the cross-section. This is due to the installation height is different due to the installation height is lower must have a cover, have a cover bad heat dissipation, fill rate should be smaller.
◉ 4, different sealing. Metal trunking sealing is better, not necessarily support bracket support, can be laid in the cable trench and building mezzanine. Trough bridge some are semi-open, must have brackets for support, in the house or outside the house is generally set up along the air.
◉ 5, different strength. Bridge is mainly used for laying power cables and control cables, trunking strength is lower, usually used for laying wires and communication cables, such as Internet telephony.
◉ 6, different bending radius. Bridge bending radius is relatively large, most of the wire channel to turn right-angle bends.
◉ 7, different spans. Bridge span is relatively large, wire channel is relatively small. Therefore, the fixed bracket difference is large, the number of support bracket difference is large.
◉ 8, support hanger spacing is different. According to JGJ16-2008, the line channel is not more than 2m, the bridge is 1.5~3m.
◉ 9, the installation is different. Bridge has a special specification (see CECS31.91), and no special specification fixed wire channel.
◉ 10, plus the cover plate problem. In CECS31 “steel cable tray project design specification” in the definition of the bridge is a general term, cover for the annex, in JGJ16-20088.10.3 mentioned, the bridge installation height can not meet the requirements, should be added to protect the cover. That is to say, the definition of the word bridge is not including the cover plate. However, in GB29415-2013 “fire-resistant cable trunking box”, the wire channel is a whole including cover plate
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Post time: Sep-29-2024