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electrical wiring

  1. C

    Non CE lighting without earthing

    Good evening, The wife decided we should have a row of Victorian style cast iron lamp posts up the side of our house. As the dutiful husband I went off and did some searching and found a company selling fairly well reviewed products. Fast forward a few days and the item is delivered, a...
  2. K

    Looking for a C7 Power Cord

    Hi Everyone, I am looking for a 10-15A power cord terminated with an angled (90) IEC C7 polarized male connector. I can find hundreds of non-polarized ones but can find none that are polarized. Does such a plug exist? Has anyone seen one or know of a place that supplies them? A complete, made-up...
  3. J

    The First Table in Section 7 of Onsite Guide....

    The first table in the OSG, p64 (it has no table name). It says the following maximum loads are assumed per circuit, and then it lists circuits and their rating, along with Load. My question, is this table showing maximum load that it's recommended these circuits should reach? Or is the Load...
  4. L

    The Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020

    What's everyone's take on this? Mandates inspect every 5 years by a QUALIFIED person, whereas EAWR and BS7671 state COMPETENT person. Obviously it won't stop cowboys but does raise the Competent v Qualified debate...
  5. J

    electrical network of coffee trailer

    hello, some advice please about the electrical network of the coffee trailer, (how I have to approach this)? thank you,
  6. C

    Refurb what’s next

    Doing refurb, total rewire & new DB, it’s a remote building, utilising Swa sub. Swa is a 2c 16mm, there is main water & gas to be bonded, At moment this all connects to old DB, in my opinion this does not comply, given my recommendations, client refuses to pay extra for what’s been ok for years...
  7. J

    Diversity on a Ring Final

    Hi there, I'm just trying to get myself into cable calc and my first hurdle is demand and diversity. I understand the majority of what is coming across in tables A1 and A2 OSG but I'm just struggling to clearly understand what I should be using for demand on a domestic 32amp ring final...
  8. R

    Meter tails over 3 metres???

    Good morning Looking for some advice on a domestic job. The consumer unit is being moved from kitchen to cupboard in hallway. The meter is staying in same place but the distance between meter and board is around 7 metres. I have been advised to fit a 100amp isolator at meter and run tails from...
  9. J

    Can someone help me fix an issue with my doorbell?

    Ok so I tried to replace my door bell, but when I took it out the wires were twisted and snapped off too short to rewire. I’m a trainee electrician with little to no experience so I’m stuck. Can I get some more wire and try to extend it by wrapping it around the old wire and covering it with...
  10. P

    The Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020

    Good Evening All, I hope this is the correct forum, please do move if I have my neutral in the live / wires crossed. Thank you for your help with my HMO query. In return, you may be interested in the draft of The Electrical Safety Standards in the Private Rented Sector (England) Regulations...
  11. C

    In ceiling speaker isolation

    Morning all, wondered what your thoughts are here. I‘m doing a rewire in a property along with a new consumer unit for a client. they have now asked for installation of 4 pairs of in ceiling Bluetooth speakers, each pair is supplied by a 12v transformer. I’m trying to decide on the best way of...
  12. S

    How do I certify when there are no rcds to test

    I have an elderly client that wants some additional sockets adding to a ring final circuit, some are simple spurs and some will need the ring extending - pretty simple jobs. she also wants some independent switching in her lounge, an additional light in the hallway with 2 way switching - again...
  13. P

    SWA cable calculations!!

    Ive been asked to confirm the maxium possible supply for an existing SWA sub main and I know im doing something wrong with my cable calculations. Its a 10mm 3 core SWA currently on a b40 on a split load boad but its about 120m run ( direct burial) and they want to run an airsource heat pump...
  14. P

    Terminating armoured...

    Morning all, When terminating armoured into a Cu on the outside of the casing I.e sides, top, bottom, we use a gland this is straight forward but what if the cable comes into the back of the Cu how do you terminate safely and sturdy it in that case? Surely thru a grommet with relevant fire...
  15. B

    Is electrical design and testing mandatory for temporary structures?

    Is electrical design and testing mandatory? Let me qualify this with "I know it is" The problem is I have a client who refuses to accept that any and all electrical systems need to be designed properly, installed, tested and commissioned according to the EAWR and BS 7671 and temporary...
  16. D

    AFFD's and new circuits

    Hi All, I'm a quilified electrician that's been office based for the last two years, I'm a little out of touch so please go easy if this is an obvious question! I'm having an extention on my home this year and been thinking about additions and it got me thinking, are AFFD's needed when...
  17. J

    Light fitting.

    Hey guys. I've fitted 3 LED chandeliers with no issues. Doing the 4th and having a big issue. Everytime I switch it off, the breaker trips. This one has 2 mains connections coming into the light as opposed to just one with the others. Any ideas?
  18. R

    DNOs attitude towards earthing!

    I find this statement from the UK power networks official website so amusing I couldn't resist sharing it. For a domestic electrician, the connection to earth is thought of as one of the most critical electrical safety features. This is what they tell their customers: "It's worth noting that...
  19. G

    Extract Fan 1 Amp fuse - but UK only

    Hi All, Been asked to fit a bathroom extract fan that a customer has already purchased. When checking the manufacturers instructions they are stipulating a double/ triple isolating switch - nothing unusual there - but they are then stipulating a 1 Amp fuse and then in brackets 'UK Only'. This...
  20. 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...
  21. 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...
  22. L

    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...
  23. 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...
  24. 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
  25. 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...
  26. 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...
  27. 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...
  28. 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...
  29. 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...
  30. 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...
  31. 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...
  32. P

    duplicate protective conductor question

    Is there a requirement stipulating a final circuit supplying only one socket outlet should incorporate a duplicate protective conductor?
  33. 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...
  34. 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...
  35. 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...
  36. 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...
  37. 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...
  38. 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...
  39. 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...
  40. A

    Consumer unit heights

    Hi guys I've read consumer unit heights are to be situated so that the breaker switches are between 1350mm and 14500mm from the floor in a new build property. Is this really the case. Is this a must or can the consumer units when being installed in a new build property be installed lower for...
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