|Conductor Cross Sectional Area||Reference Method 100# (above a plasterboard ceiling covered by thermal insulation not exceeding 100mm in thickness)||Reference Method 101# (above a plasterboard ceiling covered by thermal insulation exceeding 100mm in thickness)||Reference Method 102# (in a stud wall with thermal insulation with cable touching the inner wall surface)||Reference Method 103# (in a stud wall with thermal insulation with cable not touching the inner wall surface)||Reference Method C* (clipped direct)||Reference Method A* (enclosed in conduit in an insulated wall)||Voltage drop (per ampere per metre)|
Wherever practicable, a cable is to be fixed in a position such that it will not be covered with thermal insulation.
Regulation 523.7, BS5803-5: Appendix C: Avoidance of overheating of electric cables,
Building Regulations, Approved Document B and Thermal Insulation: avoiding risks, BR 262, BRE, 2001 refer.
DISCLAIMER: This information has been supplied in good faith and the upmost care has been taken to ensure the data is accurate in it's derivation from BS7671.
However, this information should not be considered as a substitute for BS7671, which should always be referred to. It remains the responsibility of the user to ensure all data and assumptions are correct and that any cable used is suitable for its intended purpose.