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PME Mains on Private Networks

Simon Gallagher

Am I correct in thinking that on a large site with a private HV network (licence exempt distributor), they can use PME mains for the LV, designed to ENA standards and in compliance with ESQCR?

There seems to be a belief that ONLY a DNO can use PME mains.

Thanks in advance.

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    It's worth remembering that, if it's later planned for the site to include, at a later date, Solar PV, storage, etc., then there can be issues with ground currents if inverters are connected in the "TN-C" portion of a TN-C-S system, which can affect inverter operation/efficiency. (I haven't included V2X in there, because 722.312.2.1 not not permit EV charging to be supplied via a circuit with a PEN conductor, see below).

    With some technologies, DC protective conductor currents could be a concern also.

    If you are using BS 7671, there'd potentially be a need to iron out any conflicts between BS 7671 and ENA guidance (BS 7671 does not apply to systems for distribution to the public, other than prosumer's installations covered by Chapter 82, i.e. shared PEI).

    If you are supplying EV charging equipment, 722.312.2.2.1 might require some interpretation, as it's just 'a circuit' which could be a [any] distribution circuit as well as a final circuit. How you define 'installation' might be important, but equally if you are distributing with a system where BS 7671 applies, to an installation that has (or could reasonably be expected to have) EV charging equipment, would 722.312.2.1 apply (considering the wording of the Scope in 722.1)?

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    It's worth remembering that, if it's later planned for the site to include, at a later date, Solar PV, storage, etc., then there can be issues with ground currents if inverters are connected in the "TN-C" portion of a TN-C-S system, which can affect inverter operation/efficiency. (I haven't included V2X in there, because 722.312.2.1 not not permit EV charging to be supplied via a circuit with a PEN conductor, see below).

    With some technologies, DC protective conductor currents could be a concern also.

    If you are using BS 7671, there'd potentially be a need to iron out any conflicts between BS 7671 and ENA guidance (BS 7671 does not apply to systems for distribution to the public, other than prosumer's installations covered by Chapter 82, i.e. shared PEI).

    If you are supplying EV charging equipment, 722.312.2.2.1 might require some interpretation, as it's just 'a circuit' which could be a [any] distribution circuit as well as a final circuit. How you define 'installation' might be important, but equally if you are distributing with a system where BS 7671 applies, to an installation that has (or could reasonably be expected to have) EV charging equipment, would 722.312.2.1 apply (considering the wording of the Scope in 722.1)?

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