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Surge Protection requirements

aligarjon

Hi Guys.   Just a bit of advice if possible please  A basic large domestic property with a couple of CU's, one is via a sub-main out to an extension.  I have been asked to change the CU 's as there is no rcd protection. I will recommend surge protection to them as it's easy to do at this stage.  Would just at the intake position be enough or better at both.  Thre sub-main currently comes out of the first consumer unit.  If i do it that way i suppose 1 device covers everything. However if space allows i might split the tails and fit a switchfuse, in which case would that section want its own, and if so where.  My gut thought would be to fit one in each CU .

Gary

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  • 0

    On runs of more than 10m from an SPD you can get resonance effects (which I don't profess to understand - maybe Mike can explain it!) which can double the peak - so if the spike is clamped to 1.5kV at the first CU, it may be 3kV at the second CU. So a good rule of thumb is to SPD every DB in the absence of any more specific information.

  • 0 in reply to wallywombat

    Thankyou

  • 0 in reply to aligarjon

    There is an argument to say that we should not be fitting SPDs in ordinary domestic installations simply because they don't really help that much. For commercial or other high risk areas then fair enough.

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  • 0 in reply to aligarjon

    There is an argument to say that we should not be fitting SPDs in ordinary domestic installations simply because they don't really help that much. For commercial or other high risk areas then fair enough.

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