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protection

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  1. L

    UK Are surge protection devices fitted before or after the main switch

    Are surge protection devices fitted before or after the main switch
  2. M

    RCCB selection for 3 x Solarlake 17000TL inverters in horticultural location

    Hi There Trying to rectify a solar installation also containing a double socket in a horticultural location. Current setup does not have any RCD protection. Solar setup: 3 phase TNC-S supply - 3 x Solarlake 17000TL inverters - 50kW installation The problem I am having is selecting the...
  3. dlt27

    Time delayed rcd’s and fault protection

    Have been to a farm today that has a 100mA time delayed RCD main switch covering a DB that has MCB’s on majority of circuits ( less than 32A) and 30mA RCBO’s on sockets, lighting etc. What I was thinking was does this comply with regs as circuits less than 32A should disconnect in less than...
  4. N

    RCD spur additional protection

    Afternoon all, Quick fire question. Can a RCD fused spur still be used for additional protection under the 18th. I haven’t got my BBB with me and I recall it giving BSEN numbers for devices used for additional protection and RCD spurs not being one. Job with extra lights and changing board...
  5. A

    Meter tails issue

    Hi guys I'm installing a CU in a new build and have a couple of questions I need some guidance with regards to the meter tails. I need to drill a hole through the wall (for the meter tails) to access the main supplies which are located in the recessed box on the outside of the property. I am...
  6. G

    RCD protection

    hi all conducting eicrs in amusement arcades usually nothing is RCD protected. sockets no RCD protection in general is c3 but when would this become c2 in this instance as it is an existing installation decades old
  7. A

    Zs values when there is additional RCD protection

    Hi everyone, Consider we have an RCD+MCB protection for a circuit. if we follow the tables for Zs values of a 10A, MCB, type C, the maximum value shall be 1.75 Ohm, this happens when 100A current flows ( as per MCB breaking curve). When the RCD disconnects the circuit in much less current, why...
  8. K

    Disconnect, grounding and mechanical protection requirements when bringing power to a chicken coop...

    Hi, I want to bring 2 x 20A (@120V) to a chicken coop. It will be powered from my garage panel which will require 140' of cable. 85' in the garage along 2 walls, and 55' buried between the garage and the coop. I used a few voltage drop calculators and it looks like I will need a 6/3 to stay...
  9. K

    Protection against open/loose neutral?

    Hello friends, is there such a thing as a "smart meter" that I can install on my backwoods house that will trip if it detects a loose/open neutral? If so, where can I get one? Thanks very much
  10. J

    Selection of MCB for SPD protection

    Hello, I need to install a type 1+2 SPD into the main panel of a small business building, which needs lightning protection. The main breaker in the main panel is a 4 poles 40A MCB. I was looking for a SPD and I found this: Schneider A9L16634. In the technical specification sheet it says...
  11. 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...
  12. 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...
  13. 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...
  14. 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...
  15. 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
  16. 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...
  17. 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???
  18. 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...
  19. FatAlan

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

    As title, bearing in mind the thunder and lightening last night. :)
  20. 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...

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