scope:

The rules contained in this Recommendation apply to ohmic resistors (resistors for starting, transition, circuit interruption, braking, shunting, stabilizing, etc.) used in the power circuits of electrically powered vehicles in the following categories: Vehicles supplied with so-called high-voltage d.c., i.e. with between 600 V and 3000 V; vehicles supplied with high-voltage a.c. at industrial frequency or at special frequencies; multi-system vehicles capable of being supplied from a number of the systems described above; vehicles with independent power source (i.e. accummulators, or heat with electrical or other transmission) but excluding vehicles. They are also applicable to resistors permanently or temporarily inserted in the main auxiliary circuits of the above vehicles, and any trailers and driving trailers in motor coach trains.