A: Section 7.2 – “Periodic Tests” – Every 3 years, or after any gas refilling. Calibration must be done by a certified technician using ABB tool kit ZV2-TK-01.
The (often referenced alongside the ZX2 series) is a robust medium-voltage, gas-insulated switchgear (GIS) designed for primary distribution in demanding industrial and utility environments. abb zv2 switchgear manual
Since ABB regularly updates documentation, you should obtain the for your exact switchgear serial number. A: Section 7