Now the role of cable bridge is becoming more and more abundant. The next edition of Jinan cable bridge will tell you about a series of requirements that should be met when the design allows the use of bridge system to form a grounding trunk circuit.
The metal cable conduit introduced or drawn from the metal cable bridge and its support must be reliable in grounding (PE) or zero connection (PEN), and must conform to the following specifications:
(1) The full length of the metal cable bridge and its bracket shall be connected not less than two main lines of grounding (PE) or zero connection (PEN), so that the whole bridge is an electrical path.
(2) Copper-cored grounding wires are spanned at both ends of the non-galvanized cable bridge, and the minimum allowable cross-sectional area of the grounding wires is not less than 4 mm2.
(3) The two ends of the connecting plate between galvanized cable bridges can not span the grounding wire, but there are no less than two connecting bolts with anti-loosening nuts or washers at both ends of the connecting plate.
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