circuits

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  1. D

    Signing off circuits

    Hi, if I’m qualified JIB gold and wanted to sign off someone’s work and certify it for say a landlord can I? Even I’m not part of NAPIT or the like! Thanks Adam
  2. N

    Excluding 4mm circuits on EICR, dodgy certs?

    4mm T&E circuits on 32amp breaker. Parts of the circuit run through ceiling, parts through trunking and possibly even the wall. Current carrying capacity won't exceed 30amp. Customer adamant they are fine because previous electricians have said they are fine. What do you do? Tell him tough...
  3. Rooster

    Is an RCD required with RCBO's protecting the circuits

    Surely if you fit an RCBO on each circuit, an RCD is not required? Of course, a DP Main switch would be to cut all power, but like I ask, is the RCD required as it is incorporated in the RCBO? Thanks
  4. R

    Circuits earthed on metal box/conduit: Does it need a rewire?

    I'm getting an old fuse board upgraded in an office block. The electrician has just told me that most of the circuits don't have earth cables coming directly from the fuse box. I've taken a photo of one of the light switches. (attached to post) 1. It has the earth attached to the metal switch...
  5. N

    C2 Vs C3 for no RCD on various circuits

    So I'm getting various responses to this depending on how things are interpreted. Here's a scenario: Assume property is a tenanted property. Assume cables are run buried in walls/under plaster (depth unknown). Which of these circuits merit a C2 if they are not RCD protected. 1. Lights 2...
  6. biaelectric

    Disconnection times on EPS circuits

    When there is a fault on an EPS circuit, how are we meeting the disconnecting times? Earth fault is easy - just use a 30mA B-type RCD, but for the overload, are MCB good enough? On a 3.6kW supply, the voltage will drop so quickly, will there be enough energy to trip conventional MCBs or do we...
  7. L

    Swapping lights on separate circuits

    Morning all, I am hoping to swap pendants and spotlights (which are on separate switches) that are above the kitchen island. Is there a way of extending the connections and putting two pendants where the three spotlights are and the three spotlights where the two pendants are WITHOUT destroying...
  8. W

    what is the formula for calculating PSCC for final circuits?

    hi in college and watched some YouTube videos and read up on things I think I got the right formula but I'm not sure. Zsc= Zesc(or Zdbsc) + (R1+RN) (R1+RN) = milli ohms/metre x length x correction factor and then divide that by 1000 Zesc = Uo divided by PFC Then add together Zesc and (R1+RN)...
  9. W

    Do Distribution circuits require RCD protection?

    I'm doing a college design project and need to choose a suitable range of circuit protective devices for the whole contact. I've chosen and already done all the protective devices for all my final circuits but was curious if the distribution circuits need RCD protection aswell. The project...
  10. 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...
  11. 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"...
  12. 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...
  13. 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?
  14. 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...
  15. 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...
  16. 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...
  17. Q

    UK Can you add additional sockets to non RCD protected circuits via RCD spurs or sockets?

    Evening all, If a socket circuit is not RCD protected via an RCD/RCBO and there isn't the option of fitting an additional RCD enclosure or fitting RCBOs, is it permitted to add additional sockets to the circuit via RCD spurs or additional RCD socket outlets? (type A of course)...if the sockets...
  18. 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...
  19. 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...
  20. 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...
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