Drilling through my house wall

Dan-Dan

Ok , so i have RCD protection on my CU and using 3A in my 3 pin plug supplying the outside light will help not blow the light ?

muckybutt

The 3A fuse is there to protect the wiring from the plug to the fitting so you could happily run a 500W light and still not blow the fuse.

The cable size I would recommend you use would be 1mm 3 core flex.

Drill size around the 16mm mark would be ideal.

27col

I beg to differ, drill from the outside in. If your bricks are at all hard like mine you will get a very nasty and unsightly breakout, if you drill from the inside. Also you can easily see the mortar to drill the hole through. I have 2 very nasty breakouts where Virgin cables have been installed.. You may need to do a bit of measuring to ensure that the hole ends up where you want it on the inside. But it worth it to take the time to do it properly.
.It is much easier to repair a hole in plaster than it is to make a nasty brick breakout look reasonable.

Ectophile

jbainbridge wrote: »

Going inside to outside angle the bit very slightly down - so water does not track back in along the cable.

And don't forget to put a drip loop in the cable on the outside, just to make sure.

fluffpot

If you are drilling, then to minimize breakout, switch off the hammer action of your drill for the final bit. You can work out when this will be by measuring the thickness of your wall and marking the drill bit with some tape so you know when you are getting close

Dave_J_3

Measure and drill from outside to inside through mortar angle slightly upwards to prevent moisture tracking back.
Cheaper and easier to fill or re-plaster a small area than it is to replace a blown brick

0.75mm or 1mm flex cable protected by a 3A fuse

Gauge drill bit size by thickness of cable but I think a 12mm is usually fine.

Dan-Dan

cheers all , i measured this morning , the wall is 800mm thick , so what size is best for the drill bit length ?