circuits

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  1. Y

    Number of Conduits run and number of circuits

    I am in estimation and often estimate conduits run in the drawings. My clarity about number of conduits run is not good. I want to know that in multiple circuits zone, how we calculate number of conduits run to the panel. For example. If i run conduits from Ckt A-1 to ckt A-2, i need Two number...
  2. M

    Recording of 3-Phase Circuits

    Hi all! So, I was filling out a test sheet for a number of 3-phase circuits we did an EICR on. For years whenever a 3-phase circuit exists I have recorded them on a single line (eg. 1/TP or 1/L123) and recorded the highest or lowest value applicable to that particular test regardless of...
  3. Sparksaflyin

    Dual board with no earth on final circuits

    Hi guys. Need to change the fuseboard at my parents house but none of their final circuits have a cpc run to them. Obviously have an earth on the main incoming so I can get a 16mm earthing conductor up to my new 18th edition metallic consumer unit but they don’t want a rewire so none of the...
  4. R

    Extending ring final circuits

    Hi. I have a CU move to do - around 5m from current location. There are 10 circuits, 4 of them ring finals. I'm considering whether to extend the rings 'as are', or to split the rings somewhere in their approximate middles and extend them to separate RCBOs as radials, the aim being to reduce...
  5. S

    RCD tripping under high load on 2 circuits

    I’m in desperate need of someone with great fault finding knowledge. I have a dual rcd consumer unit as seen in picture. The left hand side rcd trips when anything with a high output like a tv for example is turned on in any sockets protected by the left rcd. The left rcd also trips when trying...
  6. P

    3p breaker feeding 3 x 1p circuits

    Hi everyone. I may be blind but I can't find a definitive answer. Can I use a 3 pole breaker (originally feeding a massive 3 phase heater) to feed 3 single phase circuits? I've run seperate neutrals for the 3 new circuits and the breaker is rated for the load required - 30a per phase (I'd...
  7. W

    Cooker circuits fusing down ???

    Hello I’ve pulled out a electric oven and the connection plate at the back for the cooker circuit has 2.5mm hardwired to the 6mm circuit for a 1.76kw load and also a 6mm connecting a induction hob,unknown load. Does the 2.5mm need to be fused down or is it okay being spurred off the cooker...
  8. kingeri

    10mA RCD for bathroom circuits

    Been to look at a job this morning for a CU change, customer the type who wants to have his say on every tiny detail. He has already bought the CU as well, a Wylex RCBO unit..... I pointed out that the RCBO ratings he has bought don't align with what I actually need...and that some will need...
  9. Z

    I never install ring circuits, the potential for danger is unacceptable

    I’d like to know if anyone else here refuses to install ring circuits in domestic premises. For me it’s either a 20a radial / tree circuit with 2.5mm, or a 32 radial / tree circuit with 4.0mm. Frankly I’m tired of finding broken ring circuits on 32a CB’s, as well as mismatches on end to end...
  10. Michael J

    Lighting circuits are not earthed

    hi all, yesterday I went to carry out an EICR on a 1 Bedroom Flat. The lighting circuits are not earthed,the installation is about 40 years old. The only thing I can do is C2 would you agree? It has RCD protection. It has some class 1 fittings.
  11. ETradesmen

    Bunches up lighting circuits

    Good morning all! Currently carrying out an EICR on a commercial property and have noticed 8 lighting circuits bunched into 2 MCB’s. 0-EE74-FE0-F729-4048-A7-F4-2979-EBDFD688 - https://ibb.co/hCTKpsC No real danger but not very practical as nuisance tripping could occur and the labelling is a...
  12. S

    Supply and final circuits for stables.

    Hi all, just looking for advice prior to a potential upcoming project supply stables for horses. The supply characteristics into the main house is TNCS and the stables are located approx 40m away from the building. I am thinking of putting a 1w non-rcd protected consumer unit at supply end...
  13. S

    Documenting new circuits in existing board

    Evening all. So got a job coming up; adding new circuit to exsiting DB. When I do my very, do I just need to do it for new circuits added, or do I need to list all circuits on the very even though I’m only adding new one? .
  14. T

    EICR every 3 years for EM light circuits

    Evening all Got an email from a prison we do work at who said they have been told that any circuits that contain emergency lights need to periodically tested every 3 years on top of the 5 yearly test. I have looked through the IET but cant see any info on it? Can anyone point me in the right...
  15. T

    New circuits wired into a plastic consumer unit

    Had to install a ring main & cooker circuit for a new kitchen we have been doing. The consumer unit is hager split load but is plastic. There is no room in the cupboard to add another board and the customers dont want to pay for a board change. I guess i could just note on the form saying...
    • TJC1
    • Thread
    • circuits consumer consumer unit new plastic unit wired
    • Replies: 66
    • Forum: UK Electrical Forum
  16. Q

    How to test a circuits in steel conduit as the cpc

    Good evening I am currently a training to become an electrician. I do hold both initial verification and periodic testing qualifications however this is an issue I have never personally had to deal with and was never mentioned on any of my courses as often seems to be the case. Basically I am...
  17. spud1

    What if a circuits Max Zs is exceeded but the circuit is protected by an RCD?

    Just processing an EICR and noticed a couple of final circuits measured Zs values (fed from a sub distribution board) slightly exceed the Max permitted Zs values for the OCPDs that protect them. Obviously I will note this as a design flaw in the observations, but I just wondered, from the...
  18. C

    Additional CU in Garage for Two Circuits?

    Hi We live in a new build (2015) and the developer added Power and Lighting to the garage via a double socket (spur from house) and then a single light coming off the socket (via FS) for the garage. I then added another driveway floodlight off another FS. Anyway, we plan to do some garden work...
  19. cliffed

    Adding circuits to a full DB

    what's your take on adding circuits to a full DB. Warehouse unit,3p DB,full to capacity,new 3p circuit to be added,client refuses to upgrade DB. Would you reconfigure a couple of circuits to allow for this new circuit.
  20. J

    1x swa to do 2x circuits

    Looked at a job for a old boy- and wanted to keep costs down for him and make my job bit neater/simplier Job is to get new swa from new little rcbo board inside house to a external ip65 light switch and then into 6x external lights then he also wants to power his little shed at end of garden...

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