Installation requirements for cable bridge and busway

(1) The metal bridge and the cable trough and its support shall be connected with the ground (PE) or low (PEN) main line at no less than 2 points in total length.

(2) The two ends of the connecting plate between the non-galvanized bridge and the two ends of the connecting plate between the non-galvanized wire slots should be crossed over the copper core ground wire, and the cross-sectional area is not less than 4mm2.

(3) The two ends of the connecting plate between the galvanized bridge and the connecting plate between the cable trough are not connected to the ground wire, but the two ends of the connecting plate are not less than 2 connection fixing bolts with anti-loosening nuts or anti-loosening washers.

(4) The bridge should be laid under the flammable and explosive gas pipelines and heat pipelines, and the clear distance from the pipelines should meet the requirements of the table.

(5) The bridge laid in the shaft and through different fire protection areas shall have fire insulation measures in accordance with the design requirements.

(6) The bolts between the bridge and the support, the bolts of the bridge connecting plate, are firmly fixed, and the nuts are located on the outside of the bridge.