IEC 60517 Revised
IEC 60517:1975
High-voltage metal-enclosed switchgear for rated voltages of 72.5 kV and above
Specifies requirements for gas-insulated metal-enclosed switchgear in which the insulation is obtained, at least partly, by an insulating gas other than air at atmospheric pressure, for alternating current of rated voltages of 72.5 kV and above, for indoor and outdoor installation, and for service frequencies up to and including 60 Hz. For the purpose of this standard the term
CHFÂ 200.-