IEC 60077-2:2017 RLV
[Current]
Railway applications - Electric equipment for rolling stock - Part 2: Electrotechnical components - General rules
...When the component has more than two positions the number of operating cycles shall be
distributed using the C1 to C3 categories so that:
the distribution represents the expected service for the rolling stock;
all positions are tested...
...NOTE For example, a master controller may be is considered as being of category C3 as regards its traction and
braking handle, whereas its emergency braking position is considered of C1 usage...
...Then, the number of operations
can be distributed 70 % for traction positions and 30 % for braking positions, as estimated for the actual service
expected for the rolling stock (tram, locomotive, etc...
