Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 8 replies
  • Subscribers 40 subscribers
  • Views 1537 views
  • Users 0 members are here
Options
You may also be interested in
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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

Parents
  • 0

    It all rather depends where you think the surges you are trying to trap are coming from  - if the answer  is down the mains from outside, then the place to knobble them is at the origin, and if done well that is enough.

    If there are loads in the outbuildings that will also create spikes and surges, such as big motors or welders, then do it there too. If the sub-main is so long and exposed that it is an antenna that will pick up atmospheric events like distant lightning, in the same way that the DNO overhead lines do then maybe you need both for that as well.

    I realise that is not a simple yes/no answer, but it should explain why there isn't one for all situations.

    Mike.

Reply
  • 0

    It all rather depends where you think the surges you are trying to trap are coming from  - if the answer  is down the mains from outside, then the place to knobble them is at the origin, and if done well that is enough.

    If there are loads in the outbuildings that will also create spikes and surges, such as big motors or welders, then do it there too. If the sub-main is so long and exposed that it is an antenna that will pick up atmospheric events like distant lightning, in the same way that the DNO overhead lines do then maybe you need both for that as well.

    I realise that is not a simple yes/no answer, but it should explain why there isn't one for all situations.

    Mike.

Children
  • 0 in reply to mapj1

    Thanks Mike.  I have just come back after having a quick look to quote.  The whole job is far from straight forward from what i can see.  They have only just moved in, this is the place i looked at just before Christmas where they were getting shocks from a metal light switch. Since then they have found a further 2 consumer units , their origins unknown, or at least not obvious or labelled. There is also a supposed 30amp supply to detached garage, origin not obvious from labelling. All this and they work from home so i haven't been able to switch anything off to investigate.   Looks like an EICR is in order first.  Neutral face   I am sick to death of EICR'S .  Oh and they are talking car chargers as well, i haven't done any of those yet.   Suppose i better do some research.  :)

  • 0 in reply to aligarjon

    Have you tried the Martindale Fuse Finder? Very useful in these situations, and very reliable. I labelled two large dis boards in a 24 room hotel spread over four floors in a day, with a helper at the other end of a radio. It is in the van, so I’ll post it’s part number tomorrow. 

    Regards,

    Alan. 

Community Rules & Guidelines