Reference method

[Dave 85]

What reference method would you guys put for standard house wiring (T&E through loft/underfloor/chased in walls behind capping)

 

[Guitarist]

Cheers Des, very helpful
Forgive my ignorance but what is the 100's club? Is it like club 18-30 but for (very old) pensioners?
The first half of the above question is serious btw

As the others have already said, it's the 100 series of installation method on page 67 of the OSG. Basically, if you immerse the cable in insulation, you can HALF the ccc!
Most of my methods are "B", as I tend to put everything in conduit and bring it through insulation.

 

[Dave 85]

Yes I did, cheers dude, in hindsight I don't even know why I asked the question having thought about it, it obvious, so am I right in thinking the R1+R2 result should be the same as R1 end to end plus R2 end to end divided by 4?


Also would I put 101/102 etc on the cert as opposed to A B or C for a cable in insulation?

 

[Des 56]

Also would I put 101/102 etc on the cert as opposed to A B or C for a cable in insulation?​

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As others say, if you have more than one install method along a circuit always go with the one with the lowest current-carrying-capacity for the cable you're using.

There you go,Jud answered your question before you got chance to ask it lol

 

[Guitarist]

Yes I did, cheers dude, in hindsight I don't even know why I asked the question having thought about it, it obvious, so am I right in thinking the R1+R2 result should be the same as R1 end to end plus R2 end to end divided by 4?


Also would I put 101/102 etc on the cert as opposed to A B or C for a cable in insulation?

Yes mate, that's correct. In reality, the R1+R2 will probably be slightly higher on your test sheet as there will no doubt be a spur or 2 and we have to record the highest reading.
As others have said, worst case on ref method. Think of it as the weakest link

 

[PC Electrics]

It's all covered very nicely in the OSG, pages 66, 67 and 150 specifically