Cavity wall.

[Rob.quick]

I need to extend a cable that runs inside the cavity wall of my house, am I legally able to do this? And if so what connection type would you use? The ideal solution would be to replace the cable however, this is not possible due to the location. The cable is for an external security light running at 0.5A.

Many thanks.

 

[D80]

What kind of insulation?

 

[Rob.quick]

Rock wool I think it's called

 

[telectrix]

that's not a problem then. cable won't overheat as the current is well below it's capacity, even in insulation.

 

[D80]

some of the older wall insulation attacks the pvc of cables. apart from that, as long as the cable is not prone to damage from chafing, should be OK. however, i would drill from by the JB straight through the wall and then run surface outside in black flex.

Seen it a few times where the polystyrene wall insulation has taken off all the PVC cable insulation. No problem until the cable is moved at all.