Practice #4 –Proper grounding and bonding techniques, such as multiple conductors or voltage limiters, are required at all discontinuities within the GIS. This includes SF6 gas-to-air connections, SF6 gas-to-cable connections, SF6 gas-to-oil connections, and where GIB exits the building. ...
the panel grounding and the piping bonding are unrelated when it comes to function. The grounding wire that runs from your electrical panel to the grounding electrode helps even out voltage increases that often occur because of lightning and other causes....
Care should be taken to design a system that is appropriate both for clearing ground faults and dissipating lightning energy. Reference // Grounding and Bonding For Electrical Systems by ERICORelated electrical guides & articles Practical lesson in grounding and bonding of Gas-Insulated Switchgear (GIS...