CI...... corection factors for thermal insulation

[martinh89]

Hi could sombody please help, im currently coving cable calculations and volt drop. I understand the process and how to determine csa but could sombody please help me out as to where there is a table in bs 7671 ci to size of insulation. I found this table on line and just wondering if theres anything similar within the 17th edition, i cant find anything in appendix 4.

Table 4.5 - Derating factors (CI) for cables up to 10mm² in cross-sectional ---------------- area buried in thermal insulation.​
Length in insulation (mm)​	Derating factor (CI)​
50​	0.89​
100​	0.81​
200​	0.68​
400​	0.55​
500 or more​	0.50​

 

[Andy78]

It's there. Just not in appx 4. Look up thermal insulation in the index.

 

[telectrix]

i looked up thermal insulation on google and got 1001 sites selling long johns.

 

[Andy78]

Get the pink ones with the bunny tail on the back.

 

[telectrix]

gerroff. they're for geordies.

 

[trev]

gerroff. they're for geordies.

An wats ya problem there lyk bonny lad?