Installation Requirements for Cable Trays and Busducts:

(1) Metal cable trays, wire troughs, and their supporting brackets shall be connected to the main grounding (PE) or neutral (PEN) trunk line at no fewer than two points along their entire length.

(2) For non-galvanized cable trays and wire troughs, the connecting plates between sections shall be bridged at both ends using copper-core grounding wires; the minimum cross-sectional area of ​​these wires shall be no less than 4 mm².

(3) For galvanized cable trays and wire troughs, the connecting plates between sections do not require bridging with separate grounding wires; however, each connecting plate must be secured at both ends by no fewer than two fastening bolts equipped with anti-loosening nuts or anti-loosening washers.

(4) Cable trays shall be installed beneath pipelines carrying flammable or explosive gases, as well as beneath thermal pipelines; the minimum clear distance between the cable trays and these pipelines shall comply with the specifications listed in Table 6-11.

(5) Cable trays installed within vertical shafts or those passing through different fire compartments shall be equipped with fire-blocking and sealing measures at the locations specified in the design requirements.

(6) All bolts connecting cable trays to their supporting brackets, as well as the bolts securing the connecting plates between tray sections, shall be fastened securely, with the nuts positioned on the outer side of the cable trays.