Cable tray procurement guidelines and key points of choose and buy

 First, is located in the places of vibration of bridge system, including the bolt connection of the grounding part, should be spring washer.
Second, the requirement of fire metal bridge, deal with outer surface metal components applied in conformity with the relevant rules of the state of refractory coating.

Third, the metal bridge system, should have a reliable electrical connection and grounding, the use of FRP bridge, along the bridge length should be the other special ground wire laying.

Fourth, the selection of cable tray, shall meet the following requirements: the large number of all plastic cable Ming fu, or cable span distance, high voltage cable serpentine resettlement way, appropriate USES cable tray.

Fifth,straight run of five, ladder, tray over the following length, there should be no less than 20 mm of expansion joint:
1, steel, 30 m.
2, aluminum or glass steel, 15 m.