scope:

The rules contained in this Recommendation apply to apparatus installed on motive power units in the following categories: - vehicles supplied with so-called high-voltage d.c., i.e. with a voltage between 600 V and 3 000 V; - vehicles supplied with high-voltage a.c. at industrial frequency or at special frequency; - multi-system vehicles capable of being supplied from a number of the systems described above; - vehicles with independent power source (i.e. accumulators, or heat engines with electrical or other transmission) but excluding road vehicles. They also apply to apparatus installed on control trailers, or distributed among trailer coaches of multiple unit trains.