ROUTING ELECTRICAL CABLES

[bauerjan]

I WISH TO RUN CABLE VERTICALLY IN A PLASTERED CONCRETE WALL. PLASTER THICKNESS IS NOT SUFFICIENT TO ACCEPT CABLE WITHOUT IT PROTRUDING.

CAN I USE AN ANGLE GRINDER TO CUT A CHANNEL IN THE CONCRETE?

MANY THANKS

JAN

 

[Steve]

stop SHOUTING

And yes you can channel the concrete, as long as its not more than a quarter of the brick / concrete thickness if i remember rightly.

 

[stevesey]

stop SHOUTING

Well he is abroad

 

[Spark123]

Be prepaired for a divorce too, if you use a grinder on concrete it creates a bit of a mess too!! (OK, a bit of a mess is probably putting it a bit lightly)

 

[Steve]

I was going to suggest a hosepipe to dampen the dust, but this would probably have the same end result . . . divorce.

 

[securespark]

I was going to suggest a hosepipe to dampen the dust, but this would probably have the same end result . . . divorce.

Hose down the missus if she gets hot-headed...

 

[Mascard]

Sorry to piggy back off of someone else but it is an appropriate place to ask what about back boxes ?

The average brick is 10cm thick and even the shallow back boxes are 25mm, so a 35mm back box or a 47mm cooker box will easily be more than a quarter of a brick thick.

Once again sorry for the piggy back but I would be interested to know.

thanks

 

[FredFlintstone]

Sorry to piggy back off of someone else but it is an appropriate place to ask what about back boxes ?

The average brick is 10cm thick and even the shallow back boxes are 25mm, so a 35mm back box or a 47mm cooker box will easily be more than a quarter of a brick thick.

Once again sorry for the piggy back but I would be interested to know.

thanks

Yes, but you'll probably have at least 12mm of plasterwork on that brick so you're only sinking the box 23mm into the brick.

 

[davelx]

The regulation refers to cable chases, not to cutouts for back boxes.

The cut out for a back box is not very wide or high, so will not significantly weaken a wall even if it is 50% of the depth - after all, you can take a full brick out of a wall for an air vent with no problem.

A chase for a cable, on the other hand, will run for a significant portion of the height or width of the wall, and cutting it too deep will weaken the structure.