I mentioned in another post that I would contact HSE regarding any issues reported to them arising from loss of neutral and EV charging points. They have responded and confirmed that there has been no incident reported to them. However, they were made aware of a small number of situations that were a result of poor or no load management. I should point out that this is HSE in Northern Ireland.
6.1 In accordance with The IET Wiring Regulations (Eighteenth Edition) BS 7671 and ST:TP21E, “ A PME earthing facility shall not be used as the means of earthing for the protective conductor contact of a charging point located outdoors or that might reasonably be expected to be used to Charging a Vehicle located outdoors unless one of the following methods is used” :-
The charging point forms part of a three phase installation where all of the demand including the Charging point/s are balanced over all of the available phases.
The car charging installation includes an earth electrode of sufficient resistance to ensure that the Rise of Earth Potential (ROEP) will be limited to a maximum of 70 volts during a broken neutral event.
Protection against Electric shock is provided by a device which disconnects the charging point from the live conductors of the supply and from protective earth within 5 s in the event of a broken neutral.
6.3 TT earthing arrangements shall be utilised by Electric Vehicle Charging Points that do not meet the PME requirements specified in clause 6.1.
6.1 In accordance with The IET Wiring Regulations (Eighteenth Edition) BS 7671 and ST:TP21E, “ A PME earthing facility shall not be used as the means of earthing for the protective conductor contact of a charging point located outdoors or that might reasonably be expected to be used to Charging a Vehicle located outdoors unless one of the following methods is used” :-
The charging point forms part of a three phase installation where all of the demand including the Charging point/s are balanced over all of the available phases.
The car charging installation includes an earth electrode of sufficient resistance to ensure that the Rise of Earth Potential (ROEP) will be limited to a maximum of 70 volts during a broken neutral event.
Protection against Electric shock is provided by a device which disconnects the charging point from the live conductors of the supply and from protective earth within 5 s in the event of a broken neutral.
6.3 TT earthing arrangements shall be utilised by Electric Vehicle Charging Points that do not meet the PME requirements specified in clause 6.1.
