This part of IEC 61851 together with part 1 gives the electric vehicle requirements for conductive connection to an a.c. or d.c. supply, for a.c. voltages according to IEC 60038 up to 690 V and for d.c. voltages up to 1 000 V, when the electric vehicle is connected to the supply network. This standard does not cover class II vehicles. NOTE Class II vehicles are not excluded, but the lack of information on this type of vehicle means that the requirements for the standard are unavailable at present. This standard does not cover all safety aspects related to maintenance. This standard is not applicable to trolley buses, rail vehicles, industrial trucks and vehicles designed primarily to be used off-road.