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  1. Kuba

    No reading N-N end to end on a ring main

    I’m doing some tests on my board at home in order to prepare it for an upgrade. It’s an old plastic GE board with no rcd protection. Doing continuity of ring final circuit on the main ring. When it comes to end to end tests at the consumer unit I’m getting no reading between neutrals. All good...
  2. D

    6mm Main Earthing Conductor

    I'm looking at doing a CU change. Current main earthing and bonding conductors are both 6mm. Tails are 16mm on a 60/80 amp fuse (TNCS). ZE = 0.1 , 230v, single cable not bunched. Looking at the regs (543.1.1) and applying the adiabatic equation (543.1.3), 6mm seems ok for main earthing...
  3. H

    Is it advisable to feed a 1,600 Watt Quooker heater from a ring main spur?

    I will soon be installing a 1,600 Watt Quooker hot water heater for which a new 13A socket will be required. A ring main cable passes behind the kitchen cabinet that houses the sink and I have the choice of either inserting a single junction box into the ring and feeding the new socket via a...
  4. Pretty Mouth

    Main bonding, supplementary bonding

    A technical question: Regulations require us to bond extraneous parts back to the MET with an appropriately sized bonding conductor. I don't dispute that, that's what the regs say so that's what I do. In situations such as outbuildings with extraneous parts, where the distributor's earth is...
  5. V

    Extension socket exploded, problem with extension block or main wiring?

    I have a 4 socket extension block plugged in, in my bedroom. Just plugged genuine iPhone charger into it and instantly loud bang and the socket + charger burnt out. Although no damage at the wall socket. I assume this is just a problem with the extension and not the wall / main wiring? Just need...
  6. B

    Main fuse protection

    In our house the main fuse is rated at 100A maximum. The individual circuits in the consumer unit, if all used simultanuously, add up to much more than 100A. Now I understand this is common practice as it is assumed that not all circuits will be used to their max at the same time (the...
  7. buzzlightyear

    SUB MAIN IN FLATS

    been out to test a 1st floor flat and all the sub mains and meters are in a hall way ground floor going to each flats which are 5, the sub mains are not rcd protected ,i guess when it was converted and tested to the 16th or there about . can not see how it was installed so the building...
  8. LewisM

    Old main switch/fuse unit

    Hello, I have never seen one of these before, is it possible to remove the main switch and the fuse box enclosures to fit a new CU but leave the main fuse enclosure alone Also what date would this unit be from as the house was built in 1948 but rewired in mid 80s but it looks like they've...
  9. cliffed

    Main protective earth bonding conductors

    We are now told no bonding is required if the Water enters via plastic insert, same with the Gas.. So why are we bonding the Lighting protection conductor to the Main earth terminal bringing an extraneous conductive inside the building,when we are actually trying to prevent this happening.
  10. O

    3 phase ring main in a tool room. X6 16A sockets

    Hi, I have been tasked with installing 3 phase ring main in a tool room. X6 16A sockets. Each pice if kit will pull no more than 5A. Planning on using 4mm SWA cable protected by a 63A breaker. Tool room dimensions are 7M X 5M. Any problems with this?
  11. tank

    Main breaker trip

    Hi guys, why might a fault on a final circuit in an apartment trip the dp c63 submain circuit breaker in the plantroom but not any mcbs on the consumer unit in the apartment?
  12. D

    Sub Main Zdb Test

    Hi, this is my first post here. I have a 3 phase board with a 40amp circuit breaker supplying a single phase board to a small office. I understand that with the 3 phase board how to get the Ze thats not an issue. How do I test to get my Zs (Zdb) for the single phase board? Do I link the L&E...
  13. S

    Main circuit keeps blowing

    Hi, we just bought a little house and are having issues will being able to run what we need. I am looking for advise to help manage over the next couple weeks and some insite to what is going on. The circuit blows and the whole house goes out off of the switch that says 15. We need to run space...
  14. C

    Lighting circuit supplied from a 32A ring main socket.

    Hi guys, I am adding a lighting circuit to a Ring main 32 A. Can I just use a 6A MCB type B in a box on DIN rail to supply my lighting. I am using 1.5mm cable after the 6 A MCB. Thanks for your advice!
  15. D

    Fused main switch - tails over 3m

    A quick question regarding tails and the 3m length. I need to move a consumer unit, however it will be around 5m from the DNO cutout. Is it acceptable to install a REC2 isolator at the meter cabinet, 3m tail length to an accessible position and then a fused main switch, followed by around 2m of...
  16. J

    Zs for a CU with sub main and fused isolator

    Setup: Consumer unit fed via sub main from a 60A fused isolator switch. This is connected to the service head MET via a 2m earth connection. How would one go about both calculating and documenting the Zs? Would you be treating the fused isolator switch as it’s own db and therefore be...
  17. G

    Main bonding gas

    Hi, just looked at a job to replaced a CU in an old bungalow with a detached garage (garage has is own CU). The gas meter/supply is in the garage and currently no visible bonding. My question is where should the gas be bonded and which CU should it be run from or should it be bonded both in...
  18. J

    MCB as a Main Switch in Garage Panel?

    Hello and thanks for checking this out. I have a garage with its own consumer unit and at this point I'm trying to get some feedback on the pros and cons whether its best to install a "double pole mcb" or "main switch" in the garage panel before going to the individual mcb's. so whats your...
  19. C

    RCD Main switch on TT system

    Hello everyone, Does an RCD as main switch in a TT system a must or not? My question is can you use an isolator and then RCDs for the rest of the distribution board? Thank you
  20. B

    Sub main 125m in16mm with 80A 1361 over current device

    Just been to a new build with a 125m sub main as per tittle, owner says the sparky workout the cable size, I wonder how!

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