Chasing out?

[dez0178]

Hi,
I am currently half way through my second Year at college studding C & G 2330. I am trying to get into the trade via Electricians mate, but no luck yet in doing so. I would like to know when chasing out a channel for either ring or lighting cable, should you remove the plaster until down to the brick, what is an acceptable or the correct depth?

 

[Lighthouse Phil]

you'll need enough depth to allow at least 1/4 inch of bonding / finish plaster over your conduit / oval plastic. At times you'll need to take off the surface of the brick to allow this.

 

[Dan the spark]

You just want to chase out enough so that your conduit/ capping is below the depth of the plaster so that it can be made good after

 

[Adam W]

Chase out enough so you can get the capping in and plaster over it, but don't chase out so much it brings the structural integrity of the wall into question.
It will be easier for you if you only have to chase down to the brick, but you may have to chase the brick out if the plaster isn't thick enough.
It's a bit like 'how long's a piece of string' - it's down to the person doing it to make a judgement.

 

[jase]

depends on the surface you are chasing and what you are putting in the chase tube will need chasing out further than say oval conduit or capping, if you are putting in a back box at the end of the chase for a socket or a switch then you would have to chase that out at 25mm which would be a good depth for your cable chase.
And dont forget you have to comply with part A of the building regulations aswell as the wiring regs

 

[Guest112]

building regs say maximum a third of the depth of the wall vertically and i think one sixth horizontally (books downstairs lol)

 

[dez0178]

Cheers for the Info, just at college they don't cover every thing, but I suppose there's a lot to cover, and the simplest of things sometimes don't get mentioned. Thanks for that though folks.

 

[DNS1]

Out of interest, how are you doing the chasing? "Proper" electric wall chaser, SDS and attachment or the old fashioned way?

 

[dez0178]

I haven't chased out any wall Yet, But I would proberly after marking out a channel, use a cutting disc to create two groves then a chisel to remove the plaster inbetween most likely.( the old fashioned way, Please describe easiest way or correct way. Oh! also how do you secure oval conduit in the channel?

 

[dez0178]

Why Different depths for Vertical and Horizontal. P.s You Folks on here are great for helping out, read a load of threads on here, some really good stuff.

 

[MNR]

Crampets or screws and red plugs down the side ( I dont know if this is an acceptable method)

 

[jase]

on of these:
http://www.*************/p/erbauer-erb125y-125mm-wall-chaser-230v/81200

with one of these:
http://www.*************/p/nilfisk-alto-aero-25-21-wet-dry-230v-vacuum/41848

one of the cheapest set ups out there but ultimatly one of the best i have used, great vacumn, really does make it virtually dust free, better than any hilti vac i have hired in the past.

i usually bang in some 40mm clout nails diagnally into the coursework of the brick across the front of the tube

(replace the asterix with screwfix dot com )

 

[jase]

dam these link censors!!

 

[DNS1]

I was told (by someone on here, sorry, can't remember who!) to use an SDS and a scutch comb chisel.

A cutting disc will give a neater chase (for what it's worth) but will create sooooo much mess! Personally, seeing as it's going to be plastered in again anyway, I'd just stick with a good quality SDS drill and knock chucks of plaster/masonry out, rather than fill the place with more dust than you will ever have seen in your life!

 

[GLENNSPARK]

why are you going to mark out fancy lines and cut (presumably with an angle grinder which will introduce its own problems anyway)......a good hammer and bolster with a bit of arm behind it will suffice....and dont fart about drawing pretty vertical lines.....waste too much time with all that lot....just eye it in....you`l know when your going off course.....and a good one for skimming brick down is a scutch chisel...just the tool for the job that is.....