electrical wiring

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  1. Pretty Mouth

    Testing for electrical separation

    Hi all. I'm a member of a FB group for people trained through a particular training provider. Recently someone posted a query for testing for electrical separation for shaver sockets, and my ex trainer responded with the following method (cut n paste verbatim): you need to confirm separation...
  2. P

    Ensuring compliance with 543.2.6 (iii) when using heating pipe to bond gas main

    Interested in opinions on this. Need to put the boiler (in my own house) in a temporary location for 6 months while an extension is built, when it will go in the extension. Running a dedicated 10mm to the temporary location will be a pita, and entirely unnecessary since I already have what...
  3. Lister1987

    Cable codes reference sheet?

    Is there a document that dechypers what cable markings and codes actually mean? 6181Y and the like. I've looked on BCA, Doncaster Cables and a few others but can't find a simple explainitory guide to them, closest I've come is the BS EN standardisation document when codes changed to tie in with...
  4. T

    LED Lighting with PIR Sensor

    We are installing LED 180W High Bay lights. Most areas have 2, there is 1 with 3 and 1 with 4 so most are 360W, 1 is 540W and 1 is 720W. The PIR sensor we got said it could switch 2300W but after opening the box, it says max LED load is 100W. Why is this? Will the PIS be okay or will we need to...
  5. M

    Thermostat wiring

    Can anyone advice how to connect thermostat for el. Underfloor heating if the slots for wires are only : N, L and OUT? Does it mean I should put both neutrals in N and live from mains into L and live from heating mat into OUT? Thank you
  6. Pretty Mouth

    DNOs forbid PME earth being exported???

    https://professional-electrician.com/technical/stroma-certification-supply-chain/ In the 1st paragraph of the above article, it states "some Distribution Network Operators (DNOs) may forbid their PME earth being exported from the supplied building.". I hear this repeated a lot, or "you must...
  7. KeenPensioner

    Open PEN in TN-C-S

    I posted this in the DIY section and got little response which is unusual so I'm posting it here. Hope that's OK. I'm still learning so be gentle. I'm trying to understand the consequences of a broken PEN conductor downstream of the DNO service head. If I'm correct, this will cause all...
  8. J

    Unused conductors in trunking

    The client has decided that redundant circuits, created by us by decommissioning obsolete equipment, should be, in the first instance, removed completely. If this can be shown to be unsafe, cutting back a metre at each end would suffice. I seem to remember a regulation that unused conductors in...
  9. M

    Do I need to rewire?

    Hello all, I’ve recently moved house and I’d like a little advice on the safety of some of the wiring found. In general the wiring looks clean/tidy and reasonably new but my electrical experience is in factories, not in the home. There two things I’m not so sure about though, please advise...
  10. A

    Building Regulations breached?

    Can anyone please, tell me is there any sign of breach of Building Regulations here? My new build has been built with space for a single meter box, however, a second one was installed at a later stage. The latest borescope inspection has revealed that there is no lintel above the second box and...
  11. R

    Allowable electrical work by non-registered person

    In terms of the Part P regulations, am I as a DIYer (that is to say non-registered electrician), allowed to replace the dimmer module in a light switch myself and replace the transformer on low voltage lighting with a new one? I will not be installing any new equipment and neither will I be...
  12. N

    Steel conduits acceptable for earthing in domestic property ?

    Evening Just been to quote for a consumer unit upgrade. Found that the board was from circa 1960 and wiring looked original also. No alterations have been made with exception of a few faceplates renewed in the kitchen. Red and black single cores going into an adaptable box at the back and...
  13. P

    duplicate protective conductor question

    Is there a requirement stipulating a final circuit supplying only one socket outlet should incorporate a duplicate protective conductor?
  14. J

    Zs and parallel paths...

    Hi all, easy question I’m sure, so hope someone can clear up for me. If there are parallel paths on a circuit upon which Zs is being measured, will the parallel path cause the Zs to go up or down, and could someone explain why this would be so at all? I just need a clear understanding of this...
  15. B

    Replacing switch on a domestic heater - DIY question

    Hi. I want to replace a faulty switch on a heater circuit but need some advice - photo of circuit attached. Heater has 2 simple on/off switches - one turns a 1Kw circuit of heaters on, the other a 1.5kw circuit of heaters on, both can be on separately or together to give a possible 3 levels of...
  16. Bear

    R=pl/a and R=R1+R2

    Hey all, i honestly cant work this out, i think its the way they ask the questions and am not sure whats going where, am failing on my maths like normal, so i would love it if somebody can show me how to break this question down and how i answer it correctly. (ie. show my working) ;) Given...
  17. J

    Duty holder ___//

    Not sure if this is in the right section but I'm stuck on a 2391 question. What are the responsibilities of the duty holder in the inspection and testing process? A - manage the workforce efficiently B - manage associated risks safely C - manage testing sequence effectively D - manage...
  18. happysteve

    Is galv conduit containing insulated and sheathed cables (e.g. T&E) still an exposed-conductive part?

    Eh up :) As per the title, "Is galv conduit containing insulated and sheathed cables (e.g. T&E) still an exposed-conductive part?" Clearly, if it contained unsheathed singles, it obviously is. If it's not an exposed-conductive part (and it's not extraneous in the case I'm thinking of) then it...
  19. U

    Commercial dishwasher problems

    Hi all, I got a commercial dishwasher that is not working anymore. Normally when there's no water in the tank and boiler, the machine starts first filling it up with water if you close the lid. If I now close the lid, the machine is not taking water and is not filling. But the machine is...
  20. D

    Lost Neutral Voltage Calculation

    I understand how to calculate the current in the neutral conductor on an unbalanced three phase installation, however am struggling to grasp how to calculate the voltage movement on each of the three lines if the neutral were open circuit. I appreciate it is influenced by the current and...

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