circuits

  1. Hakuhou

    UK Data and control circuits EMC requirements

    The text says that for data and control circuits there is a need for different earthing arrangements and “rigorous” cabling to meet EMC requirements. Is this relevant in a domestic setting? Outside of running wire side by side with the current running in the same direction is there a need to...
  2. D

    Distribution circuits in apartment block

    Hi all, First time poster here, albeit long time lurker. I could do with some opinions on running distribution circuits around and through the building voids of an apartment block. The project is an old police station being converted into flats. The bloke from the private DNO approved company...
  3. timhoward

    Distribution circuits in Section 705 location, RCD needed?

    I just want to check how I should be interpreting section 705. 705.411.1 states required disconnection devices, the first two indents covering final circuits and sockets, requiring 30ma and 100ma RCD's depending on rating of socket. Indent 3 says " all other circuits" need 300ma RCD. Does that...
  4. S

    High Zs on auxiliary circuits

    Hi I have a distribution board controlling conveyor belt in which all auxiliary circuits for start/stop switches, emergency buttons, etc are supplied through 230V/230V separating transformer.where secondary winding is earthed on one end. I've got high Zs readings for all those control circuits...
  5. R

    UK Powered speaker tripped circuits four times over a couple weeks, insulation tester result seems ok, need advice.

    Hello, stating I am not an electrician, I have purchased a fairly expensive set of used powered studio monitors and I’m concerned about one of them. I was switching the power switch at the back and I’ve switched it off quite poorly where it went back on itself and as it was half way between on...
  6. B

    UK Advice needed on narrow boat battery charging circuits please.

    I've been asked by a keen DIYer friend to to advise on how to wire his boat batteries when he has three potential inputs. 1. Shore mains feed 2. Boat engine 3. Two solar panels. I've drawn what I think would work but it's not my field, so advice would be appreciated. I've advised him to get a...
  7. S

    UK Fuseboard layout design Recommendations

    I'm after advice on how best and safely to do a friends Fuseboard upgrade. Current setup is a Wylex 6 Way board with MCBs of 2x 6A, 2x 32A and 30A Rewireable Fuse (Cooker) then from a Henley Block a Wylex 60A Switchfuse Isolator that supplies a garage DB (setup as business inside) containing...
  8. 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...
  9. 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...
  10. S

    EICR in Flat - cross-connected circuits, T&E tails, composite earth

    I'm practising EICRs on friendly locations as I'm still in training - technically done my 2391-52 but frankly need loads more practise. I've just done an EICR on a flat and a few things that I didn't know how to code/address came up: 1) How do you code (and look for) inter-connected circuits? I...
  11. 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?
  12. D

    Square D QL 2 board with the lighting circuits from two MCBs replace them with single pole RCBOs?

    Would this be Compliant, safe, on a TT earthing system with an upfront S-type RCD
  13. 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...
  14. 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
  15. 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...
  16. 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
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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