hitchglitch replied on 11/01/2019 10:47
Posted on 11/01/2019 10:47
This is a question for any practicing electricians on the forum, with apologies to other readers as it is a bit technical. Having just bought an electric vehicle and about to have a charger installed I have been researching some of the issues with houses on PME systems i.e. TN-C-S. An electric vehicle is a Class 1 appliance and has to be earthed so for an external charger installation I understand that an earth rod may be required to be connected to the charger.
So, as I have an extension lead from my garage to charge the motorhome on my driveway and my house is TN-C-S (very common nowadays) with the vehicle outside the equipotential bonding area, there is a possible risk that the van’s metal work will be raised above earth potential (due to an open circuit neutral somewhere on the supply distribution) so creating the possibility of a potential difference between the van and the “true earth”. This is a safety risk.
Although I am qualified I am not up to date or practicing and do not want to pay hundreds of pounds to purchase the 18th Edition of the Regs and codes of practice but I am aware that PME is not allowed on caravan sites due to the problem outlined above. My question is, do the Regulations cover the situation that I have described above and, if so, what is the solution?
All informed comments welcomed.