Fire-resistant high and low voltage cable bridge connection to ground

The bridge system should have a reliable electrical connection and grounding (only for metal bridges).

2. When using bridge systems to form grounding main loops, the following requirements should be met. The connection resistance between bridge ends should not exceed 0.00033 ohms, and the grounding holes should be free of insulating coatings. In systems with neutral points directly grounded at 1KV or below, the grounding of the receiving equipment is connected to the system neutral grounding. When equipped with emergency power-off equipment, the metal cross-sectional area of the bridge in the length direction should be not less than the specified value.

3. When an additional grounding main is laid along the entire length of the bridge, each section (including non-linear sections) of the bridge should be connected to the grounding main at least once reliably.

4. For vibration-prone areas, spring washers should be installed at the connection points of the grounding sections.

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