method

  1. T

    Installation method

    So, we’re creating office space out of 2 classrooms. Metal stud wall will be put up, grid ceiling everywhere. We’ve had a price by one firm. I think it’ll be twin and earth lashed in in the ceiling void based on the price (although i haven’t seen spec yet). Given a job like this, would you find...
  2. P

    Domestic Reference method / routing guidance for cable on a wall with 25mm Celotex

    I wonder if anyone could assist with this query please ? I am a newbie, so any guidance or alternatives would be greatly appreciated. I need to run a ring final partly against a wall with internal 25mm Celotex type insulation. The additional Celotex being needed due to reduced cavity...
  3. captaincaveman

    Cable method for sumerhouse power

    Hi guys, I'm just looking over a job putting power to a summer house but am wondering if anyone has any recommendations on how to lay the cable. The cable length from the house is 50M going up the house side wall, across a patio, up a 10m wall (onto a balcony garden) then across a balcony...
  4. D

    Application of Installation Reference Method

    Hello All My query is about installation reference methods. Specifically how to choose a reference method where twin and earth cable passes through various conditions when none of the methods seem to fit actual site conditions. Site conditions are domestic situations where I find myself...
  5. A

    Domestic Advice on rewire method

    Hi all, just got a property for myself and looking to rewire it. Have only every rewired houses with old floorboards but this property has the wayrok sheetboards. Anyone got any experience of of the best way to lift without ruining them too much? Thanks in advance
  6. Bobby34

    Insulation Resistance testing method

    Good afternoon, apologies if this has been covered before i've not long joined so gradually finding my way around. I have my Part P assessment coming up on a new installation and would like to hear some opinions on how people carry out their IR tests. In guidance note 3 it gives an example of...
  7. R

    Long method de rating factors

    Having used Amtech for so long I can't remember if the de rating factors are applied to the design current or the tabulated regs current, can anyone give me a refresher example calc, I guess it has to be tabulated if it's a current reducing factor
  8. Gavin John Hyde

    Whats your method for holes in ceilings

    Been fitting some new lights today in a Georgian townhouse that has been converted to apartments. Finding the unexpected in these old buildings around Bath is nothing new. Took the old light down and the hole in ceiling is 4 inches across at its widest part, good point was I could get my arm up...
  9. Edtwozeronine

    Can anyone point me towards a complete installation method table

    I have one in the OSG and I have the BSI IET (size of a yellow pages) regs book. I found this too: http://www.tisoft.com/en/support/help/electrical/reference/bs7671/tables/table-4a2-schedule-of-installation-methods-of-cables I've chosen A for air tight conduits in the concrete wall of a...
  10. haptism

    Reference method for cable behind kingspan

    Hi, been looking at which reference method would be suitable in this case. The cable drops of a ring circuit to each socket are fixed direct to a concrete block wall (using capping) ; kingspan boards are to be dot&dabbed directly to the wall. Im thinking worst case would be ref method 102...
  11. A

    Reference Method Question

    Hi all, I'm not an electrician, just like to understand things for self learning. I was reading about how reference methods will derate the cable. However, either I have some misinformation or I am not fully understanding. Given the example of twin and earth, inside plastic conduit, buried in...
  12. Sparky_marky2

    SWA armour supply to outbuilding, what CSA cable? and Reference Method?

    Hi guys, I am running a supply to an outbuilding that requires a 22m run from the Main CU (in the garage) to the CU in the outbuilding, at the Main CU it will be a 40A MCB supplying an 63ma RCD protected sub board which will then supply: 6A type B MCB for 12 downlights and an extractor fan 32A...
  13. Les Macaulay

    Domestic Lighting Circuit Methods In New Builds

    To my knowledge, there are 3 methods of splitting the line conductor in each lighting circuit: Joint box below floor, or above ceiling Three terminal ceiling rose/batten lampholder Joint in switch box (neutral) I am wondering which method is most commonly used in new houses. I have been in...
  14. S

    What reference method

    Cables clipped to a brick wall with plasterboard dot n dabbed over them what reference method ? And any proof as ref c says clipped direct but nic inspector says that means just clipped to a wall the rest of the methods says insulation ?
  15. haptism

    Ring final install method query

    Hope someone can help. When finding the cabling current capacity for a ring (wired in 2.5), would you use the data for 4mm in either/or table D5 of BYB or table 7.1 (11) in the OSG ? As the ring circuit is in effect 5mm ! Looking at the OSG ref methods; a 2.5 with ref method 101 says 17A...
  16. M

    Cooker wiring dilemma

    A house renovation, including kitchen extension, all plastered out with a 10mm twin+e feed in place for the 7.3kw induction hob. The single oven and the combi microwave should have been spurred from the kitchen ring as each being 2.9kw. Neff have decided to up them to 3.45kw for the oven and...
  17. yellowvanman

    Cooker/Hob circuit

    Customer asking for a quote to re-vamp kitchen. Got some high end ovens/hobs: Hob: 7.2kW Oven: 3.7Kw Steam Oven: 2.9Kw Warming Drawer: 0.81Kw She has told me other electricians have said another cable needs to be run for all this. Problem is that the CU is full, is build into a small...
  18. V

    lighting wiring

    Hello all, When wiring a lighting circuit is it possible to go from the RCD to each switch in the house, then from each switch go to the relevant set of lamps for that particular room?
  19. Leesparkykent

    BT wiring

    What's the preferred method for wiring telephone points? Is it best to Star/spider wire or loop in and out in a radial? which method does BT prefer? Is there any benefit of one over the other? Cheers
  20. charlie76

    Domestic Unknown installation method

    Evening guys and gals. On your generic schedule of test results after completing a consumer unit swap, what do you put for installation method if you are unsure. For instance, the house I have completed today is all stud wall, it didnt appear to contain rock wool to the internal walls but it...
  21. M

    Domestic How this wires has been pulled?

    Hello everyone! Does anybody know how this 3 cables from loft has been pulled down to first and ground floor,if the coming through 3 holes in the wall.?Is there any specific method of pulling wires?Please help. Thank you very much.
  22. a-z electrics

    Knipex installation pliers

    Knipex installation pliers 1396 200 these are the sprung loaded ones. I believe..6 in 1 tools, they sound pretty useful.. Anybody used them? Any good?
  23. D

    continuity test on steel trunking?

    Hi guys Just a quick one. Doing 2394/5 going through mock paper can't find answer anywhere. How would a continuity test on length of steel trunking be carried out? Any help appreciated
  24. H

    Loop method using Fluke 1653

    Hi all! I tried to measure earth resistance by loop method using fluke 1653 at MR system (TN) in hospital. But got abnormal results. The primary (upper) display showed 0.16 - 0.2 (loop impedance) and secondary - 0.0 - 0.1 (earth resistance) Is there some limitations using this method? Cant find...
  25. N

    10.5kW Shower Cable Size

    Hi all, Would a 10.5kW Shower require 10mm or 16mm twin and earth? I've been doing cable calculations at college and im not 100%. Cable Length = 20m Protective Device = 50A Wiring method = Above plasterboard ceiling not exceeding 100mm insulation I belive 10mm is sufficient but my calcs...
  26. driverman

    wiring downstairs light circuits

    As some of you know, I'm doing a first fix for family member. I now know that in a modern house its best to do loop method of wiring from switch to switch due to modern day down lighters and light fittings only accepting one cable. I did have a thought though (bear with me) as there are 3 x...
  27. H

    2395 Earth Electrode Resistance Testing

    Earth Electrode Resistance Testing 2395 Hey guys, I'm up for my 2395 soon, although I understand how each of the three methods is carried out I can not seem to find anywhere that tells me why one method would be used over another? some of my sample paper answers are till use test method one...
  28. E

    manufacturer's instructions vs common sense!

    Ok I know this is dragged up time and time again regarding the 3a fuse on a fan debate but i had an interesting one today. i am installing a belling 100dft range cooker, the manufacturer's instructions are tight lipped about the actual wattage of the bleeding thing but the info I got was that...
  29. Y

    Basic testing

    Ok, so I am in college studying a level 2 course (2365) and its coming to the end of year were we have to do a practical installation and then testing. I've taken the test once and failed. My tutor, taught me and others things that are contradicted both in the On Site Guide, a book by Trevor...
  30. C

    Adding second light to existing switch

    Hi everyone, In my garage there has always been one only ceiling light which isn't really adequate when working on projects in the garage. Therefore I'm looking to add an additional light (well 2 really but we'll call it 1 to simplify things). This first diagram shows the existing wiring...
  31. N

    Cooker circuit and diversity.

    Evening all. Customer needs a new oven and electric hob. The current setup is 6mm T+E on 32A MCB, RCD protected, about 8M run, reference method 100. The oven they are looking at is 10.5KW. I initially thought that was too much but after adding diversity it seems ok. Are my calculations ok as I...
  32. M

    Voltage drop calculation

    Hello everyone just want a little help how you would calculate the volt drop if 230 single phase heater circuit line & neutral conductors combined resistance of 0.68 Temperature at 20 degrees and load current of 16A? show calculations got this in my 2395 today wanna make sure I used the...
  33. D

    What a shower

    Just been along to see a potential client. They want an estimate to upgrade the fuse in their 1 way splittersplitter. It is currently a 30amp cartridge fuse. They just had a bathroom company redo the bathroom, and they changed the shower to a new 9.8kw unit - which their electrician...
  34. driverman

    Cables installed in insulated partition walls

    Hi again, 2.5 TE cable installed within fully insulated partition walls which i would of thought is now pretty mush standard now on new builds / refurbishments. According to OSG guide table F6 page 150 Ref method 103. 2.5mm cable down rated to 13.5 amps! Radial for imm/htr...
  35. 1Justin

    10A MCB for 1.5mm radial to sockets?

    CU job for a customer on a bit of a budget so little room for alterations. Part of the job, I find a small single garage conversion to ground floor bedroom (ie a small room), converted in 1980’s. Found to have it's four sockets supplied via 1.5mm ring. Anyhow, reconnecting into new CU, I...
  36. R

    radial ring hybrid circuit.

    I've read about these circuit sand came across one today on a periodic (eicr) in a kitchen the spark has taken a 6mm into a 45a isolator and run a ring out on the load side to all the appliances. 60898 b32 rcd protected. In good condition to. Suppose it's not illegal it's out there!! rang the...
  37. S

    4mm radial circuit

    I've just been flicking through the regs to do some cable calcs for a job and noticed that a 4mm 2 core cable installed using method B (under floors etc) has a capacity of 30A. However it is ok to connect to a 32A MCB for a radial socket circuit. Don't know if its just me missing something...
  38. D

    doubled cable on a radial

    Hey guys I see this now and again on my rounds....8.5kw method C on 2 x 2.5mm cable......does it state anywhere in the regs that it a radial must be a single cable Or is it acceptable ? the very least i think its lazy not using 6mm but as always I'm well off from the more experienced guys think...
  39. 9

    Domestic megger 1720

    Megger 1720 Just got one of these. How to do ze I was doing it on l/pe z with red and green lead but was getting a big difference between reading with my old megger. Both calebrated. Normal test procedure used. Main earth diaconnected However i phoned megger tech and they said use red and...
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