circuits

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  1. K

    One House and 2 Consumer units needed by LL, need help with circuits

    Hi I have a job where customer has two families one families lives upstairs and one family will live downstairs. As the property is going through refurbishing and rewiring is needed but LL has asked me to install two consumer units so basically divide supply using henly blocks and supply the up...
  2. O

    2 circuits in one cable.

    Strange on this, we are wiring an extension at the moment and I would like to 3 way the (currently 2 way) landing switch to the new bedroom so there is a switch near by for the stairs. The property was supposedly re-wired when the couple bought the place about eight years ago but after hearing a...
  3. R

    Motor circuits and certification

    What tests and certification do you do for motors supplied via a motor control panel, DoL, soft starts, VSD, star delta, etc?
  4. O

    How do I enter reports when two circuits are in one MCB

    For example the house today had two lighting T&E in the same MCB. I know it's fine, but as I test both 'radials' where and how do we enter them on an EIC/EICR form on the NICEIC online certification thing? I can make extra lines on the circuit chart, but do we write them down as MCB-8a MCB-8b...
  5. 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
  6. 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...
  7. 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
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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"...
  13. M

    How to map circuits when some breakers are quads

    I have a question about mapping circuits in a single family home. I recently had my panel upgraded to an Eaton 2040 panel, and the electrical contractor who did the work did not label things very clearly, so my plan is to relabel all circuits from scratch. As part of the upgrade he installed 4...
  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. 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...
  18. 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...
  19. T

    two SPD's in CU , one for zappi MCB and one for the rest of circuits.

    hi guys please help 1. i want to install zappi into existing CU with a type2 SPD should i also protect 32A MCB for zappi with an SPD? 2. i have CU(hager VML410AH) with type A RCCB incomer only is it ok to fit SPD onto it? thanks
  20. 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)...

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