re chasing please help

[Greenworx]

Hi guys I'm getting suby doing a job for me as I've been really busy another job . I left at the job l went to see the job all chases are clipped but refusing to cap as he says according to 17th Edition if the lights and sockets are RCD protected you don't have use capping or put in conduit ,He's a very experience sparky please advise I thought it was good practice always.

 

[PJK]

I have been an electrician for a long time and in NI I have never seen wiring plastered over, it is always in oval conduit, capping not used here. All builders I know would insist on oval conduit, and it makes re- wiring a lot easier. IMHO oval is a very professional job, and will continue to use it. All the housing associations here also insist on oval conduit before plastering.

 

[Amp David]

The use of oval is good, but not if you happen to have a few twins and maybe a 3 core and earth at the switch.

 

[i=p/u]

plastic pipe it in walls, and if use a correct drill bit for a wall you will feel you hitting the pipe... but hey ho long as works..

 

[PJK]

The use of oval is good, but not if you happen to have a few twins and maybe a 3 core and earth at the switch.

It can get tight, but I use three sizes of oval, 16mm, 22mm and 25mm and am able to get a couple of twins and 3 core and earth and a few singles down. Obviously it depends on the job etc., But there is no doubt that over in NI it seems to be oval conduit for all domestic and commercial work.

 

[wade88]

The use of oval is good, but not if you happen to have a few twins and maybe a 3 core and earth at the switch.

Then widen that chase up and get another length of oval in there. If its worth doing, its worth doing proper ..... dont shout at me.....

 

[Spudnik]

Must admit on rewires i use oval and on new builds capping.

Much easier to install cables and no need to try and clip them individually to thermalite blocks or weak joints.

 

[GLENNSPARK]

use some stench pipe (110mm)....but dont forget max. depth of chases will you....
what i mean is you may find the stench pipe bulges out into the living room....if this happens just paint same colour, paper over (as best you can)....or buy some tall furniture to hide it....

 

[DNS1]

Why not go the whole hog and use 160mm?!

Is there a maximum size of "conduit" before the cable is considered to be "in free air"?

 

[DNS1]

It can get tight, but I use three sizes of oval, 16mm, 22mm and 25mm and am able to get a couple of twins and 3 core and earth and a few singles down.

Do you not end up having to apply an inconvenient de-rate to the cables with that much crammed in a conduit?

Come to think of it, I don't recall seeing anything in the regs about the size of the conduit used... Presumably you have to apply the same de-rate whether you're running a couple of 2.5mm in a 16mm oval, or Glennsparks 110mm soil pipe!

 

[SirKit Breaker]

Agree with all the other posts, but although capping is there to protect the cables from plasterers and the like, its original purpose was to stop the lime in the plaster degrading the cables. lime is no longer used in plaster, so form your own opinions of what you need to do.

Cheers............Howard

 

[Guest55]

in 20 years of sparking i've never known a plasterer to cut through a cable during bonding coat.
thats all i'm gonna say lol.

 

[DNS1]

in 20 years of sparking i've never known a plasterer to cut through a cable during bonding coat.
thats all i'm gonna say lol.

At least they've never admitted to it!

 

[applemac]

i like oval for switch drops , it payed off for me once a plumber or similar type chappy put a screw right in the bleedin wire, managed to pull old bit out followed by a nice new length job done in 15 mins