what reference method?

[telectrix]

T/E clipped direct to brick. however, kingspan backed board is to be fitted so insulation direct onto cable. my thoughts are 102 as cable is touching wall, but not the inner board as described in BS7671.

 

[Dustydazzler]

I agree , 102 is probably the nearest to what you describe

 

[cliffed]

It’s gets a bit confusing remember the days when it was just C

 

[Dustydazzler]

It’s gets a bit confusing remember the days when it was just C

Ah yes as I like to call it 'the good ole days'