The mechanical endurance test shall consist of 1 000 operating cycles with, where applicable,
50 % of the rated static terminal load applied to the three-phase disconnector or earthing
switch in direction Fa1 or Fa2 (figures 7 and 8), without voltage on, or current through the
main circuit. For disconnectors having two or three insulators and a normally horizontal
isolating gap, the 50 % rated static terminal load shall be applied at both sides of the
disconnector, but in opposite directions. For disconnectors and earthing switches with one
insulator (operating insulators not being taken into consideration) the terminal load shall be
applied to only one side of the disconnector or earthing switch.