This part of IEC 61851 applies to EV supply equipment for charging electric road vehicles, with a rated supply voltage up to 1000 V a.c. or up to 1500 V d.c. and a rated output voltage up to 1000 V a.c. or up to 1500 V d.c. Electric road vehicles (EV) imply all road vehicles, including plug-in hybrid road vehicles (PHEV), that derive all or part of their energy from on-board rechargeable energy storage systems, (RESS), including traction batteries. This standard also applies to EV supply equipment supplied from on-site storage systems (e.g. buffer batteries etc.). The aspects covered in this standard include: " the characteristics and operating conditions of the EV supply equipment; " the specification of the connection between the EV supply equipment and the electric vehicle; " the requirements for required level of electrical safety for the EV supply equipment; Additional requirements may apply to equipment specifically designed for specific environments or conditions, for example: " EV supply equipment located in hazardous areas where flammable gas or vapour and/or combustible materials, fuels or other combustible, or explosive materials are present; " EV supply equipment designed to be installed at an altitude of more than 2 000m. " EV supply equipment intended to be used on board on ships. " DC EV supply equipment that relies specifically on reinforced insulation or class III protection against electric shock. (See 61851-3-x series). Requirements for electrical devices and components used in EV supply equipment are covered by their specific product standards. EMC requirements for EV supply equipment are covered in IEC 61851-21-2 (under development). Requirements for bi-directional energy transfer are under consideration and are not part of this edition. This standard does not apply to: " safety aspects related to maintenance; " charging of trolley buses, rail vehicles, industrial trucks and vehicles designed primarily for use off-road; " equipment on the EV covered by the following standards: ISO 17409.and ISO 18246 (to be published) " EMC requirements for equipment on the EV while connected, which are covered in IEC 61851-21-1 (under development). " Charging RESS off board of the EV