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Neutral Earth Links

MS01

Hi There, 

Question on neutral earth links the Electricity Supply Regulations clearly states only 1No connection should exist. In our instance the TX is part of a PWN and therefore located in the switch panel. However introducing a permanent standby generator for back-up the question is typical is the consensus to use a 3-pole devices and have a solid neutral connection or 4-pole devices and effectively have a second neutral earth link for the generator straight on the outgoing side.  Conscious when the mains returns there will be a period of synchronisation where both the TX and generator 4-pole devices are closed effectively meaning we have 2No neutral earth link positions.

Can I ask for peoples thoughts. 

  • 0

    If you actually want to run a genset in parallel, i.e synchronous with, the incoming mains, on the consumer side of your installation,  then the UK ESQCR obliges you to have a switched N-E link, so there is only one at a time.

    The DNOs when adding emergency generators to the network during repairs etc do have more than one link, and also some private multi transformer sites, because the linking is then on the distribution wiring and not on the consumer side of the network.

    In 230V places like Ireland, and Nz/Oz where it is permitted to have two NE links in such a case, it may only be done with full regards to possibility of the maximum diversion of neutral current  passing through the earth/neutral path between the two, and nothing disconnecting. In effect a full size CPC jointed and mechanically protected to the same standard as a network neutral.  It also means that RCD protection of that branch of the wiring is not possible as the NE links appear as a fault to the RCD.

    Both approaches have pros and cons - and a variation of the same problem is common with larger UPS installations.

    Mike.

  • 0 in reply to mapj1

    Yes but unfortunately both would be on the consumer side of the installation.

  • 0

    Then in the jurisdiction of the ESQCR you will need a switched N-E link.

    Mike

  • 0

    Electricity Supply Regulations

    Just to avoid confusion amongst readers, the Electricity Supply Regulations were repealed about 20 years ago - it's the 'The Electricity Safety, Quality and Continuity Regulations' now.

       - Andy.

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