Applies only to newly manufactured static energy meters of accuracy class 1, for the measurement on board, of alternating current electrical energy or direct current electrical energy used for traction applications operating at the following supply voltages: - 25 kV (single phase) at 50 Hz; - 15 kV (single phase) at 16,7 Hz; - 3 kV, 1,5 kV and 0,75 kV d.c.