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Neutral earth links in feeder pillars

Lee Petherick

So, we have a private HV network on site that feeds feeder pillars and LV switchboards as a TN-S system.

I have multiple locations where I think there are neutral earth links that shouldn't be there, but even though it doesn't "feel" right to me, especially when I see 26 amps going down the earth conductor and only 16 amps going down the neutral in one particular place.

Example one - TP+N from TX into new feeder pillar which then feeds onto an old feeder pillar - neutral earth links in both, and they are only 2 metres away from each other.  One of these fuseways then feeds a building that has another neutral earth link in the switchpanel.

Example two - TP+N from TX into LV switchpanel (ACBs and MCCBs) which then feed two separate feeder pillars - both which have neutral earth links in them.  Although I haven't seen it myself, I am guessing that the LV switchpanel has it's own neutral earth link too.

I hope it's not correct, as I just don't see how it can be, but always willing to learn!! Slight smile

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  • 0 in reply to Jam

    Thanks - it's certainly not PME as each feeder pillar has its own earth cable, so regulation 9 coming out of 8(4) is not true - plus I don't believe we would meet the definition of a "distributor" or that our buildings are classed as "consumers".  

  • 0 in reply to Lee Petherick

    if everything on site is under common ownership, then it's a consumer's installation. you've described a private network, so I assume that you're providing a service to somebody. I think that makes them consumers and you a distributor and possibly a supplier

    ESQCR prohibits PME only on consumers' installations, not on distribution networks whether public/licensed or private/unlicensed

    this doesn't affect the engineering discussion, because you've got MEN not PME

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