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  1. T

    AM2 lighting circuit - confusion

    I know this has probably been asked a dozen times on this forum but I just want to make sure that I'm doing this the correct way before going into my exam. I got told that in the am2 I need to have neutrals at every switch in connecters. I have never done it this at work hence the confusion...
  2. G

    Multi-core neutrals and earth

    Hi, I am currently training to become an electrician. I have passed all relevant C&G level 2 exams along with C&G level 3 inspection and testing and principles of electrical science. I have been asked to help design some garden circuits but been given specific instruction on how the circuits...
  3. J

    2way switch with neutrals at each point

    Hi, I know there are many ways to achieve this. I just wanted to know that the diagram I have drawn for this 2way switch would work. Just having neutrals at each point, for future smart switches. Thanks and merry crimbo
  4. S

    Switched Neutrals or not

    This question is purely out of interest, I'm a substation apprentice while we do some LV installation work its not much and no design work fitting only. But today I've been helping a sparkie friend do some work(just attaching conduit to wall no actually wiring) for local community group. So...
  5. S

    Neutrals overheating

    On ending a call with Western Power, the previously time served sparks asked...why does many outage calls involve a melted neutral and not line conductor? 1) I suggested Line was probably getting more attention when terminating than neutral. 2) Perhaps the live busbar acting as a heat sink...
  6. G

    Shared neutrals in lighting circuits

    I am sure this has likely been discussed many times on the forum. Throughout my apprenticeship I heard about the fabled shared neutral on hall/landing light circuits but never actually come across one. I was told in college there is no way of testing directly for shared neutrals !? I am now...
  7. M

    Identifying single core cpc's and neutrals

    Just wondering if anyone has any handy tips when trying to identify single core cpc's and neutrals? I work in a few food factories that are in constant production and switching off supplies is not an option, so identifying circuits can get pretty tricky. Identifying neutrals is pretty simple...
  8. M

    Identifying single core cpc's and neutrals

    Just wondering if anyone has any handy tips when trying to identify single core cpc's and neutrals? I work in a few food factories than are in constant production and switching off supplies is not an option, so identifying circuits can get pretty tricky. Identifying neutrals is pretty simple...
  9. J

    Insulation resistance testing Lighting circuit

    Hi everyone. I'm looking for advise on how to test IR on commercial lighting. There's so many lights on 1 circuit , do I have to take out all the lamps in all the lights to perform the test or can I simply test between LN -E ? Even though I have spent lots of time testing domestic installs and...
  10. L

    Domestic RCD tripping under load

    Installing a split RCD board in a new barn conversion build, IR tests come out clear, ring continuity tests fine, but the RCD will trip out when something is plugged into the circuit, happens on both sockets that are currently running off that side of the RCD but when I swapped one over to the...
  11. driverman

    2 x RCD's tripping

    Hi guys, tried searching,whereby explanations have been given as to why a RCD will trip by a fault on a circuit that ISN'T electrically protected by the RCD tripping. Typically crossed neutrals or borrowed neutrals. I'm not into testing. Company I work for been called out to an EV bollard with 2...
  12. W

    Trailing edge dimmer interference

    Have installed 11 led downlighters to be controlled by a trailing edge dimmer switch , Inbetween the downlighters are some 0.5 watt led lights which are separately switched , when the smaller led lights are switched off the led downlighters turn dim for around a second then go back to full...
  13. M

    Domestic RCD not tripping under test

    Hi all. New user, but have lurked around here and used advice in other threads before, but haven't been able to find this problem anywhere, so figured I'd register and give it a shot. I've put in a new dual RCD consumer unit for a customer, went through all the testing with no problems, tested...
  14. G

    Neutral - Earth faults

    Had a quick look at a job which has it seems a neutal to earth fault. Set up TNC-S feeding DB with 5 MCBs, and 1 RCBO feeding lighting circuits. It was getting late and I was tired, so I suggested to the client you have a possible neutral to earth fault, and the circuit in question will need...
  15. T

    Domestic RCD doesnt trip on test.

    Hi I have a 6 way split load board located in the shed and served by 10mm SWA. Anything on the unprotected side of the board tests and works fine. However this is not the same for the protected side. I can plug a radio in and the circuit does not trip, but if I use the lawn mower or a drill the...
  16. L

    Testing for borrowed neutrals?

    How would i test for borrowed neutrals? Would it be a case of disconnecting all circuits neutrals at the DB and doing a continuity test between each neutral and seeing if any two circuits bell out? hope it makes sense and i appreciate any feedback cheers
  17. O

    Basic CCU Installation.

    Hi, Can you help me with the neutral arrangement an a CCU? I've just finishing a level 2, done a 17th, and got a part p next week, getting stuck right in but as you know its all legislation and frustratingly little actual wiring!!!!!!!! So im trying to educate myself on the side. The supply...
  18. G


    I was wiring central heating in energized ( supposidly tested ) house, with only the upstairs lights breaker turned on i was getting 240v N - E on the heating supply ( seperate 16 v supply ). Dug a little deeper and had crossed neutrals / lives on the upstairs/downstairs lighting. sorted that...
  19. S

    Domestic MEM RCD failure?

    I have a split MEM2000 board (15+ years old) with four circuits each with MCBs protected by a single 100A 30ma RCD. The RCD has been tripping out over the last 4 days at increasingly more frequent intervals (initially evry 6-8 hrs now it holds for about 30mins) It trips with the mcbs on the...
  20. F

    ring fault

    no voltage live neutral at sockets any ideas surley if lost 1 neutral would still have voltage on the other leg all neutrals are connected in main fuse box
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