- Reaction score
- 2,833
Have had an estimate accepted for a CU change in a 1980s bungalow. I based the estimate mainly on an EICR which was carried out on the property by another spark last summer, plus I had a quick look at the existing board, meter, and bonding.
The EICR has all circuits listed as ref method C, but I suspect there's a good chance it'll actually be method 101 - I expect cables for all circuits to be under insulation in the loft. Ok, no problem for the lighting circuits on 6A breakers, but the CCC of the 3 ring finals (2.5mm = 17A) and 2 cooker circuits (6mm = 27A) would be too low for 32A breakers.
Assuming that the cables are in good condition, no signs of thermal damage, what do you guys and girls do in this situation? Derating the breakers is one option, but could lead to nuisance tripping, at least for the kitchen circuits. Putting the cables in conduit is another, but it's a lot of itchy work up there that I'd like to avoid if possible, and will add a lot to the price.
The EICR has all circuits listed as ref method C, but I suspect there's a good chance it'll actually be method 101 - I expect cables for all circuits to be under insulation in the loft. Ok, no problem for the lighting circuits on 6A breakers, but the CCC of the 3 ring finals (2.5mm = 17A) and 2 cooker circuits (6mm = 27A) would be too low for 32A breakers.
Assuming that the cables are in good condition, no signs of thermal damage, what do you guys and girls do in this situation? Derating the breakers is one option, but could lead to nuisance tripping, at least for the kitchen circuits. Putting the cables in conduit is another, but it's a lot of itchy work up there that I'd like to avoid if possible, and will add a lot to the price.