In the design of the grounding trunk, full consideration should be given to the structural form of the building, the size of the building and the routing of the integrated wiring and spatial configuration, and with the laying of the integrated wiring cable trunking coordination.
The grounding trunk should be installed in the protection from physical and mechanical damage, the building's water pipes and metal cable shielding can not be used as a grounding trunk. The grounding trunk is best protected by a specialized shield, such as in a steel pipe.
When two or more vertical grounding trunks are used in the building, the vertical grounding trunks every three floors between the top layer and the grounding trunks need to be welded with the same cross-section of insulated wires.
The grounding trunk should be insulated copper wire, the minimum cross-section should not be less than 16m
As for the medical trunk is not specialized in medical use