High Voltage Gas Insulted Switchgear (GIS) Field Testing According to IEEE C37.122The final assembly of the gas - insulated substation (GIS) takes place in the field. This is where all the diverse components that make up the GIS are brought together for the first time. Even if it were possible to fully assemble the GIS in a factory, it would still have to be disassembled for transportation, shipped, and then reassembled at the installation site.The objective of the field tests is to confirm that