Recently sat the 18th Edition Course and of the understanding EV Charging points shall be fed from a TT Supply. PME is acceptable only when feeding any other equipment ie Lamp posts Ticket Machines for example and providing Type A or Type B RCD is fitted and the Charger point is then to be separately spiked. Just looking on the attached and a company called Pod Point suggest TN-S is acceptable with no need for an earth spike. Wondered if anyone else has come across this diagram and can confirm TN-S is acceptable without the spike (see - page 2)
Note that the leaflet was written in 2015, so pre-dates the 18th edition and the latest advice on EV charging. However, the advice within is still correct under the new regs, although there have been updated guidelines published by the IET, which in effect rather reduces the options if the supply is PME. But TNS is not an issue.
The problem as others have stated, is that TNS and TNC-s may be mixed on the same substation nowadays, so you need to know quite a lot about the system to be sure it is pure TNS.
Note that the leaflet was written in 2015, so pre-dates the 18th edition and the latest advice on EV charging. However, the advice within is still correct under the new regs, although there have been updated guidelines published by the IET, which in effect rather reduces the options if the supply is PME. But TNS is not an issue.
The problem as others have stated, is that TNS and TNC-s may be mixed on the same substation nowadays, so you need to know quite a lot about the system to be sure it is pure TNS.
