circuits

  1. UKMeterman

    Shower and cooker circuits shown as 2.5mm2 on shedule but overall condition satisfactory

    I am reviewing a EICR for a property I am buying. The vendor has had the EICR done, but both the Cooker and Shower are on 40A 60898 B curve mcbs and the cable type is shown as 2.5mm2 type A install methord C. I suspect a clerical error but as it is in the vendor document pack what would you...
  2. L

    I.R. testing existing circuits

    The accepted method of I.R. testing existing circuits has been to join L and N together and test to E, to protect against damaging any electronics that were inadvertently left in circuit. However ,with the increase of new types of circuits between L and E as a result of "intentional leakage"...
  3. O

    (UK) Adding additional circuits into old fuse box

    Hi all, First post here, hope I'm compliant with the rules! I did do a quick search before asking this, but I couldn't quite come up with the answer so I thought it best to ask! I'm currently going through and renovating some of my property, and the garage wiring is of some slight concern to...
  4. J

    Rccb protection of lighting circuits

    My 1990 property does not have the lighting circuits protected by the Distribution Board RCCB.Only the power circuits are protected.If I get a trip from the RCCB the lights stay on. Do I need to upgrade my system to include RCCB for lighting?
  5. J

    Intrinsically safe circuits

    Quick question, I done my compex a while ago but I seem to remember the instructor saying that if a circuit is intrinsically safe, then the equipment does not need to be rated for a hazardous area. Does this seem right? Site I’m working on has IS circuits going to valve control heads that...
  6. R

    Flickering lights on separate circuits

    Evening All, Strange one so after a bit of advice. Got called to a customer this evening who had their boiler repaired after the circuit board got fried supposedly after a power cut when the supply was restored. They were told they needed a switch fused spur fitted as there was no way of...
  7. B

    Does a CU swap require a full initial verification on all circuits before it can be energised?

    To my understanding it would be ideal to test and inspect before energisation, but it isn't 100% necessary. If it leaves a client without power, it breaches health and safety (no power to safety services etc) or inconveniences them I'd have thought it would be reasonably practicable to turn on...
  8. S

    EICR Code for two circuits on one cable.

    Hi, Currently undertaking an EICR on a factory, we have came across an 4 core SWA and 4 Core SY which have been split in the DB to serve two separate circuits. The SWA has the Brown on a 10A MCB and the Grey is on a 16A. So clearly they have shared earths and shared neutrals, similar scenario...
  9. R

    Light bulbs in series vs parallel circuits in home.

    Hi, I had a question in my head that turned out to two and then BANG im confused. I need help with calculation here and explanation to get this right. If i want to build a lamp with 20 light bulbs in a 230V home. Each light bulb is 2watt. How much current will they take when they are in...
  10. L

    Overloading circuits

    Hello. I'm in the UK, and have some questions/concerns about my kitchen set up. So the fuse box has 4 breakers/circuits for the kitchen (the lighting is on a different circuit). One circuit covers the electric oven, gas hob ignition and a plinth heater. I then have a single 20A rated...
  11. R

    Power Panel Changes Voltage with Branch Circuits

    I have a Single Phase Power box for a townhouse. When I read voltage across the Hot legs (A) and (B) to ground I get 123 volts with the main breaker turned off. With all the circuit breakers turned off and powering up the main breaker to the panel I still have 123 volts across both (A) and (B)...
  12. B

    RCD protection in industrial setting circuits

    Hi All Hope someone can help In industrial setting are all circuits required to be RCD protected ? Or is it just socket circuits ? Thanks in advance
  13. N

    25 ohms Zdb + same reading for all circuits

    Hi everyone, I have a particular job visited this morning, that on all circuits, at each point, i got a reading off around 25ohms for a earth fault loop impedance test(zs). I then thought to do the same at the DB for those circuits. Again, same reading was obtained. I then turned off the...
  14. O

    What's common practice with IR tests on lighting circuits?

    I had just installed a heat alarm on the downstairs lighting circuit during a kitchen rewire. The new kitchen ring / cooker circuit I tested IR for L-N and N-E at 500v, fine, but the DS lighting circuit consisted solely of 21 LED downlights, in various rooms and the alarm. All of which say do...
  15. S

    AFDDs for single-socket circuits

    Haven't been on here for a while, so sorry if this has been discussed before. BS7671 2018 + A2 Regulation 421.1.7 recommends AFDDs for "single-phase AC circuits supplying socket outlets..." (requires in certain premises). My intention is that from September 27th I will recommend them to...
  16. A

    7. 3 kw INDUCTION HOB

    Can I run a 7.3Kw induction hob off of 2 x 16 amp circuits single phase I'm not sure what size cable is installed, I will check. Would I be be able to run with the 2 x 16amp breakers or should I install a single 32 amp breaker with separate RCD? Thanks in anticipation.
  17. timhoward

    CPC common to 2 circuits...

    When I checked out this job I had a false sense of security from a recent competent looking EICR and two new CU's that looked to be fitted to a high standard. Most of the property does have a CPC on the lighting circuit, it's just this one room with a flat roof above that doesn't. This is where...
  18. D

    UK Radial Circuits Wired in 4mm and 32A MCB

    Guys needvadvice please I was asked to carry out an annual inspction of a DB recently There are 12 in number radial circuits suppling sockets wired in 4mm singles protected by 32A mcb the cables are enclosed in metal trunking and supply 13a socket outlets , are the mcbs now overated as the...
  19. L

    Ring circuits to be retired?

    Could the 30% leakage requirement on rcd, s, combined with the inevitable increase in kitchen appliances with intentional leakage built in, force designers to replace rings with radial circuits?
  20. H

    Multiple circuits passing through an AC isolator

    Multiple circuits passing through an AC isolator what code is this on a U.K E.I.C.R?
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