I've been speaking with the local DNO with regard supply parameters to a single retail unit being converted into 4. The current supply being a 100kVA 3 Phase and neutral supply currently supplied via a 95mm2 3 core wavecon cable. In their opinion improvements could be made to the safety of supply given a loss of the neutral connection. TT being one, but possible difficult to achieve in the centre of a town in term of getting a low enough earth connection to have a larger up front RCD to achieve subsequent selectivity. The second being, as I understand it to effectively take the TN-C-S connection out into the road to the PME network and provide a 4 core wavecon cable to the building intake possibly a fake TN-S. I can understand that two connections are possibly better one, but ultimately still TN-C-S. Can they guarantee their connection is more reliable in ground rather than in the building. What happens to sizing of the main bonding conductor ? It's quite possible I've misunderstood what they are proposing. Does neutral loss more commonly happen to one build or multiple buildings ? Looking to understand what is being proposed.
Thanks for the reply. Perhaps there is a bigger issue with PME distribution generally. I wonder if configuration would be any with single phase EV charge points.
Thanks for the reply. Perhaps there is a bigger issue with PME distribution generally. I wonder if configuration would be any with single phase EV charge points.
