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  1. H

    Reference methods for cavity walls without thermal insulation

    Evening all Just wondering what would be the reference method given for a twin and earth cable in a cavity wall without insulation....I understand with insulation its either 102 or 103 but these massively de rate a cable and so was thinking is it b without the insulation as it acts similar to...
  2. J

    If you drive a metal rod can you use it as a reference to measure voltage

    If I was to drive a metal rod in the ground and measure between live and the rod will I get a reading? ( I’m still studying)
  3. H

    Reference method for the old sheathed single core cables run in attic spaces with insulation

    Good morning I am just wondering what reference method is suitable for the old single core sheathed cables if they at some point enter an attic space under insulation.ive had a read through the regs book but still unsure Cheers for any responses Harry
  4. 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...
  5. J

    installation Reference methods how do you choose?

    I recently got pulled up over my reference method I put down on a fuse board change at an assessment. I chose to use reference method C and he said he wasn't happy because there could be worse in the house. I had been in teh lost there was no insulation other than vermiculite and the cable was...
  6. W

    ECT 5 volt reference

    My ECT 5 volts reference is dropping to 2.3 volts when the sensors is plugged in. What could be causing the volt drop please? Also return voltage to the ECM is nothing at all Thanks Jeff
  7. static zap

    Do people have a favourite Test Website - (My complicated reference WAS Maplins)

    PaigntonPete -says he has connectivity issues ! ..i previously had similar issues with "Maplin web site and PC" ... Sadly that test is no longer available. Sites with a shopping basket are normally Good !
  8. 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...
  9. happyhippydad

    Rings, reference methods and CCC...

    Following on from another thread I have just replied to it got me thinking about ring circuits and reference methods. Appendix 15 shows a ring on a 32A MCB. It does begin with a get out clause regarding thermal effects but it just points you Chapter 42 which deals with fire. If for example we...
  10. 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...
  11. happyhippydad

    What to put in 'Distribution reference' on forms?

    This is something I've been meaning to ask for sometime. What do you guys put for 'Distribution reference, or distribution reference number' on the forms? Sometimes there is what looks like a specific number on the CU, but more often than not there is nothing to distinguish a particular CU.
  12. ipd1961

    Quick reference guide for 18th

    Just completed the 18th Regs course and we were given a quick reference guide by the company delivering the course. I have redone it because there were a few typos and here it is in plain black and white or glorious colour
  13. M

    OSG, bonding plastic pipes etc etc

    Hi all Having a thumb through the OSG and on section 4.5 Main protective bonding of plastic services, it says there is no need to bond an incoming service of the service pipe is plastic....thats kind of a struggle lies on the next page; "Where there is a plastic incoming...
  14. 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...
  15. 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...
  16. A

    How to calculate the tabulated current (It) for circuits with multiple Reference Methods (A and B)?

    I am trying to select a suitable conductor size from Fig 4D1A of the BS 7671 Book, and am encountering a problem because the circuit does not conform to one Reference Method. The circuit conductors leave the distribution board in wall mounted steel trunking, then run through some steel conduit...
  17. 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...
  18. 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 ?
  19. L

    Reference Methods??

    Hi there, I was just looking to find out what would be the most appropriate reference method to use. the distribution circuits leave the fuse board in 3 meters of trunking, then onto basket most of the ciruicts at lower lever then come down the wall in conduit which has been pre installed in...
  20. B

    Off grid earthing system

    What earthing system should be used on an off grid install with a solar inverter, wind inverter, battery backup inverter and a 4.5kW floating earth generator?
  21. S

    2357 portfolio HELP!

    Has anyone done NVQ 2357 portfolio with Not A Chance? I'm just starting my portfolio bridge units 311 312 313 314 315 316 317 and 318 but really struggling how to start. It's really hard to understand the concepts of how they put their wording. My assessor doesn't explain it really well :(...
  22. H

    Voltstick Question

    I've got flu at moment so if this is a stupid/Electrical Trainee/diy type question then illness will be my excuse :).... How do voltsticks sense live cables but not neutral cables?
  23. 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...
  24. tank

    rcbo functional earth

    hello, does the functional earth of a rcbo have value of loop impedance that has to be met in order for it to work as designed?
  25. S

    Installation Reference Method

    Hi What is the installation reference method for flat T&E cable, with capping and buried in plaster, am I correct in thinking it is method C as all the others in table F6 (page 150) in the OSG refer to insulation? Steve
  26. Q

    DC Volt Drop

    Has anybody got a chart for quick reference that can show me volt drop, i know the calculation but just wanted a quick reference table. Can any body help?
  27. F

    The new EICR

    Hi I wanted to see if anyone has any question or answers on the new EICR forms. I will start with, Does anyone know what "location reference" means in the schedule of inspections?
  28. S

    Technical Reference books

    I am trying to get hold of a copy of the Electrical Safety Council technical manual. its proving really illusive! does anyone know where i could get hold of a copy. cheers
  29. P

    Domestic Domestic T&E cable

    Hi everyone, what is the Twin and Earth Cable, type of wiring & reference of method on 17th Edition? (House built in the 1970′s) Many Thanks
  30. R

    Cable ratings when in plastic conduit

    Hi Guys Trying to find the correct table in the OSG that relates to T&E in plastic conduit. Can anyone point me in the right direction. Cheers Rich
  31. Paul.M

    Old RCD reg?

    Something that I've never come across. RCD connected to the MET bar with a cream wire. Can someone explain the theory for this? Earthing arrangements for combined protective and functional purpose. I can't seem to get my head round how this would work. Only thing I've come up with is that...
  32. T

    JIB Electrotechnical Certification Scheme (ECS) JIB & alternatives

    Hi, I posted a question a few days ago about problems in getting a JIB card .. I've got all the quals including NVQ 3 and a completed apprenticeship - but my employer won't give me a reference and JIB won't issue a card without the reference - I have confirmed this with JIB !! My next...
  33. B

    Volt Drop

    This is a 2391 question DURING THE COURSE OF AN INSPECTION ONE OF THE SINGLE PHASE RADIALS supplying an item of fixed equipment is to be checked for volt drop. 45A full load, 80m length, 10mm singles,70 degree thermo singles, steel conduit, mohms/m at 20 degrees=1.83(p166 OSG)...
  34. G

    quick question.. reference voltage

    anyone no where in the 7671 anyone can find a quote or reg regarding reference voltage... the question is what conductor gives a known volage or reference voltage???
  35. U

    Surge Protected Socket Outlets

    just having a scan through the examiners notes posted regarding the 2391 noticed on of the comments made was ' "could not state the minimum test voltage to be used and the minimum acceptable value of insulation resistance when carrying out a insulation resistance test on a circuit containing...
  36. T

    ELECSA Certification Scheme Elecsa reistered members...

    Just wondered what your putting in this box (as pictured) ? Is it any reference you want to use at all or is it the pre-printed reference thats individual on the top right hand corner of your test cert for each job? what is the reference number on the right hand corner of the test cert for...
  37. G

    Number of sockets row

    Don't know if I'm going mad, senile or just plain wrong on this, so looking for opinions. At college we were taught that the number of sockets was calculated by counting each outlet point. IE, doubles and trebles still counted as one outlet point. Had a discussion with a colleague today on...
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