GIS is a precision equipment. Therefore

its in situ check and acceptance must be performed

and foundation check and accurate position determination should be conducted before its installation. This article introduced the main points in GIS installation and the technical requirement

analyzed the specific operating requirements of clean

seal

fastening

connection

vacuum degree

humidity

and so on

as well as the abnormal phenomena appeared in installation

opetation and test. Contrasting three GIS accidents

some suggestions were proposed to provide a reference to manufacturers

purchasers

installers and operators.