Covering Electrical wires with loft insulation does reduce the current carrying capacity of the wire.
For example 1.0mm Twin and earth cable that quite safely fed the upstairs of a house will have it's rating reduced, this means in some circumstances the loft wiring that is covered deep in insulation would need upgrading to 1.5mm.
Are cables covered by loft insulation a fire risk?
in Fire Prevention
Posted
Covering Electrical wires with loft insulation does reduce the current carrying capacity of the wire.
For example 1.0mm Twin and earth cable that quite safely fed the upstairs of a house will have it's rating reduced, this means in some circumstances the loft wiring that is covered deep in insulation would need upgrading to 1.5mm.