EV Charging Terminology

PEN-fault protection is protection against hazards caused by a broken or open combined protective and neutral conductor in PME/TN-C-S supplies. It is normally assessed during product selection, circuit design, installation verification and maintenance of EV charging equipment.

PME earthing is an earthing arrangement where the supply uses Protective Multiple Earthing with a combined neutral and protective function upstream. It is normally assessed during product selection, circuit design, installation verification and maintenance of EV charging equipment.

PME protection refers to protective measures used to address risks associated with Protective Multiple Earthing supplies, especially open PEN faults. It is normally assessed during product selection, circuit design, installation verification and maintenance of EV charging equipment.

Power daisy chaining uses a supply arrangement where power is routed from one charger or connection point to another in a chained layout. It is normally assessed alongside phase availability, circuit capacity, protective devices, cable sizing and DNO/site constraints.

Power output is the electrical power a charger can deliver to an EV, normally stated in kilowatts. It is normally assessed alongside phase availability, circuit capacity, protective devices, cable sizing and DNO/site constraints.

Power supply refers to the electrical supply arrangement feeding a charger or group of chargers. It is normally assessed alongside phase availability, circuit capacity, protective devices, cable sizing and DNO/site constraints.