Cable tray bridging grounding

The relevant requirements for the bridging grounding of cable trays mainly include the following points: 1. The grounding resistance must comply with **standards and must not exceed the specified values. 2. The material used for the grounding wire must meet the requirements. 3. The connections of the grounding wires must be firm and reliable; methods prone to failure such as welding shall not be used. 4. The grounding wire should make good contact with the cable tray; there should be no gaps or looseness. Regarding the relevant standards and specifications for connecting jumper wires to fiberglass cable trays and ensuring proper grounding, the following standards can be referred to: 1. GB 50168-2006 \"Code for Electrical Design of Buildings\"; 2. GB 50054-2011 \"Code for Construction and Acceptance of Electrical Installations\"; 3. DL/T 1373-2016 \"Technical Regulations for Cable Tray Systems in Buildings in the Power Industry\".

The relevant requirements, standards, and specifications for connecting jumper wires and grounding fiberglass cable trays are the same as those for metal cable trays. It’s just that what isn’t a problem for metal cable trays becomes more prominent in fiberglass cable trays. Mainly because the cable tray itself lacks the function of being a conductor, it is rather difficult to ensure that \"each section of the cable tray must have at least two grounding points.\" 　　 General practices: 1. Make use of cable tray brackets to form the grounding system as much as possible; otherwise, the grounding system (such as flat steel) can only be laid along the cable trays ； 2. The cable trays are connected using metal fittings, and the grounding wire (copper wire of 4mm2 or larger) is pressed together with connection bolts. If non-conductive connectors are used, a bypass connection must be made to provide grounding ； 3. Connect the grounding wire led out from the cable tray to the grounding system. 　　It is best to carry out proper work on the design side, by obtaining a document outlining the grounding requirements or indicating that grounding is not necessary (since fiberglass cable trays are used, considerations such as resistance to static electricity, no need for shielding, and protection against lightning apply; therefore, there is also a reason why grounding might not be required). Some fiberglass cable trays come with metal shielding layers or metal connections, and for such trays, as long as the metal connections are properly made, there is little difference between them and metal cable trays. .

Thank you all, I’ll check the specifications and study them

Although it is mentioned in the guidelines, I personally think it is difficult to implement. Fiberglass is a non-metallic material and an insulator; electricity cannot flow through it. Even if connections are made and a grounding electrode is used, the charge cannot be conducted away. So this type of grounding is ineffective; I’m not sure if that’s correct.