Terms in Electrical Protection category referencing IET 01
Standard or regulation
IET 01
IET 01:2024 is a non-statutory IET standard and technical specification for Open combined Protective and Neutral conductor Detection Devices used with EV charging equipment. It sets out definitions, requirements and tests for how discrete or integrated OPDD functions should respond to open PEN conductor faults.
I
Internal PE Breakage
Internal PE breakage refers to a charger design where the charger has a means of interrupting or isolating the protective earth path internally as part of its response to a detected PEN fault condition.
O
Open combined Protective and Neutral conductor Detection Device (OPDD)
An Open combined Protective and Neutral conductor Detection Device (OPDD) is a device or integrated EV charging function designed to detect conditions associated with an open PEN conductor fault and disconnect, or initiate disconnection of, the affected circuit or equipment. IET 01:2024 sets definitions, requirements and tests for OPDD behaviour.
Open PEN Detection
Open PEN detection identifies conditions that may indicate a broken or disconnected combined protective and neutral conductor. It is normally assessed during product selection, circuit design, installation verification and maintenance of EV charging equipment.
P
PEN-Fault Protection (PEN)
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
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
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.
T
TN-C-S Earthing
TN-C-S earthing is an arrangement where neutral and protective functions are combined in part of the supply and separated within the installation. It is normally assessed during product selection, circuit design, installation verification and maintenance of EV charging equipment.