NF C64-402:1995 Gas-insulated metal-enclosed switchgear for rated voltages 72,5 kv and above. Requirements for switching of bus-charging currents by disconnectors.
2005NF C64-471-102:2005 High-voltage switchgear and controlgear - Part 102 : alternating current disconnectors and earthing switches.
1995NF C64-402:1995 Gas-insulated metal-enclosed switchgear for rated voltages 72,5 kv and above. Requirements for switching of bus-charging currents by disconnectors.