The 1000 volt restriction is because in the uk and some other places, this is considered as the upper limit of "low voltage" Higher voltages are not specifically prohibited but would require a whole raft of additional safety precautions that would almost certainly render anything over 1000 volts not viable.
Use of a three phase supply for charging might not alleviate concerns regarding a broken CNE in a PME system. The so called earth, which is actually the neutral in disguise, will still be connected to a metallic vehicle and thereby exposed to touch.
For a large vehicle charging facility that has a dedicated transformer, it might be best to go back to TN-S.
For one or two EV chargers of modest capacity connected to an existing system it becomes more complex.
The 1000 volt restriction is because in the uk and some other places, this is considered as the upper limit of "low voltage" Higher voltages are not specifically prohibited but would require a whole raft of additional safety precautions that would almost certainly render anything over 1000 volts not viable.
Use of a three phase supply for charging might not alleviate concerns regarding a broken CNE in a PME system. The so called earth, which is actually the neutral in disguise, will still be connected to a metallic vehicle and thereby exposed to touch.
For a large vehicle charging facility that has a dedicated transformer, it might be best to go back to TN-S.
For one or two EV chargers of modest capacity connected to an existing system it becomes more complex.
