Indoor GIS equipment typically involves wall-penetrating installations, except in cases with cable in/out connections. In most cases, the main or branch bus duct extends from indoors through a wall to the outdoor side, where it connects to porcelain or composite bushings for overhead line connections. The gap between the wall opening and the GIS bus enclosure, however, is prone to water and air leakage and therefore usually requires sealing. This article discusses why cement-based sealing is not
10/24/2025
Consult
Tip
