protection

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  1. T

    18th edition surge protection

    Hi, School premisses officer here, wanting some advice. Each year we have to have a fixed wiring test on the 6 circuits 3 lighting, 3 power on our swimming pool area. Fed from a 3 phase board. I follow the regs a bit and have a keen interest Due to budgeting I wanted to know if when we get...
  2. Marvo

    Surge Protection in Low Voltage Electrical Installations

    Marvo submitted a new resource: Surge Protection in Low Voltage Electrical Installations - Risk assessment analysis for South Africa Read more about this resource...
  3. A

    UPS protection

    Hi everyone, would be great if you can share your experience on type of protection devices recommended on UPS system feeder/upstream? as you know, in some type of critical installations such as hospitals, bank servers,..etc, the client does not want to see UPS loads gets cuts off in no...
  4. H

    RCD protection

    Good afternoon all. So question for you; if you were doing some minor works on property and noticed lighting circuits are not on RCD protection would you advise the customer? I looked at a small job and mentioned changing mcbs for rcbos. I know there’s people who would just do the work and go...
  5. N

    Surge protection

    Morning all, Quoting for a garage supply and I’m needing too add an additional 1 way board too supply it. Due to space in existing board. Is surge protection required for such a job if I don’t undertake the risk assessment? Or only required for board change and rewires? Thanks in advance
  6. E

    Lightning protection in Africa

    I have a problem with lighting protection in a charity in Zambia. The earthing is TT, i.e. earth pits or rods are provided for almost every building. I have measured the resistance of these and some are half to one ohm. But others are 100 ohm which is is dreadful and we are redigging these...
  7. M

    Do I need over current protection?

    Hi guys, i'm working on some project, do i still need over current protection if i'm using a soft starter and do I still need circuit breaker for that motor???
  8. T

    RCD protection for cables above a plasterboard ceiling

    Are there an reg for cables being above a plasterboard ceiling? Pricing a job to move a kitchen to the other end of the house. I thought about running a 16mm T&E to a submain board instead of running 4/5 circuits back. The old kitchen ceiling ceiling is coming down and the rest would be ran in...
  9. FatAlan

    Anyone aware of any surge protection earring it’s keep last night?

    As title, bearing in mind the thunder and lightening last night. :)
  10. mydigitalhome

    Lightning Protection Certificate

    Hello Guys, Hope you can help do any of you have a sample lightning protection certificate that you can send me? I'm working on a site away from home not back for a few weeks and need to refresh my memory on things I need to do. Just had the client make this request so was not prepared for it...
  11. cliffed

    Protection on Tncs / tt system

    Pme Swa sub main supplying external tennis courts. Because of cable size,tt system will be installed. The original Pme supply comes from main distribution area,from a Bill Switchfuse isolator,63 amps. The new tt system is ze 13 ohms,the Pme earthing system is 0.35 ohnms. No connection to the Pme...
  12. A

    Rcd protection for domestic inatalls.

    Hi guys. Am I right in interpreting the regs with regards to rcds that they need to be rated equal to or higher than the main supply fuse? So not to overload them? Or am I reading it wrong? Thanks on advance.
  13. E

    Introduction to Surge Protection Devices

    Hi Guys just reading this link & thought someone might be interested Practical tips for installing surge protection devices in low voltage panel | EEP -...
  14. polo1

    Motor protection

    Peeps, I have been asked to run a supply for a single phase, 3.2a extract fan (systemair AW500E4). Is it a requirement, recommended or just good practice to include thermal overload protection in such a situation? Thanks.
  15. H

    Requirements for RCD protection

    Good morning all. So question; if you’re making additions to an existing circuit, but the new cable is not min 50mm deep in wall or mechanically protected and the current circuit is not RCD protected do you tell customer that RCD protection is required as per the regs? My thought is yes and...
  16. V

    Lightning Protection

    I have a Liquid Nitrogen tank getting installed on site, its 16m high adjacent to a taller building and I'm providing the power to it. There are plenty of earth spike locations near it but, purely from observation other sites don't appear to have any means of protection so, how do I know if it...
  17. spud1

    Surge Protection for off peak DB too?

    Hi guys, So I have a domestic scenario where off peak E7 storage heating is installed. Client has asked for a DB upgrade and has opted for surge protection. Currently they have separate ON and OFF peak Wylex fuse boards tailed individually from the origin, the meter is 2 metres away. If I...
  18. FatAlan

    Domestic Lighting - RCD protection

    Coming across a few installations with no RCD protection. How are folks finding it out there when doing minor alterations / additions to existing lighting circuits with no RCD protection bearing in mind 18th Edition requirements. Appreciate every installation is different. Are folks replacing...
  19. juice

    Meter tails protection

    I work with temporary electrical installations to construction sites at the moment and have a query related to supply arrangements. The supply earthing sysytem is a TT type. The main cut out fuses I've been told are 200A and the supply tails are 70mm in a three phase arrangement. These 70mm...
  20. C

    Metframe RCD protection

    Good Evening Have been testing a converted office block to flats last week and have found many circuits non RCD protected that serve high level Spurs in the landlords corridors (3 inches below ceiling). I was told that they don’t need RCD protection as the cable runs in between two metframe...

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