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.

 

[robsparky1975]

Good practise yes,beneficial as to stop a plasterers trowel damaging the cables,i have seen many a job where cables have been clipped direct then plastered over.

 

[robsparky1975]

incidentaly the rcd protection is for cables buried at a depth of less than 50mm from the surface amoung its other uses relating to whichever circuit it happens to be providing additional protection.

 

[SYKRAPS]

If you are paying his wages and you want it capped then tell him its your way or the high way...........I would always use capping btw but he is quite correct if external influences allow

 

[Greenworx]

Thank you for your quick response hes a lot more experience then me didn't want to say anything unless I was sure thank again

 

[DNS1]

Personally I've always been completely bewildered by the use of capping...

I've done a hell of a lot of plastering and I've NEVER managed to damage a cable with my trowel! Really not sure why some people insist on it! If you're talking about filling a chase, well the plasterer would have to be fairly incompetent to be jabbing his trowel in and ruining the cable sheath!

 

[SYKRAPS]

I use capping because that was the way I was taught many many moons ago so I guess it comes down to my teacher, but I agree its purpose is bizzare although I think it look neater before the plaster hides it lol

 

[Deleted member 9648]

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.

You sure he's not a plumber?......his 'experience' clearly doesn't extend to a knowledge of the regulations.

 

[Amp David]

In a chase I usually don't bother capping but if onto new block or brick i do, as most of the time the wall don't get plastered for a whiles and theres sometimes other trades in the place crashing into everything, including new cables

 

[lauriehurman]

The heat dissipation, and hence the current carrying capacity, of the cable clipped to the wall and plastered over is GREATER than a cable in conduit.
In my very humble opinion capping won't stop a nail or a drill bit so doesn't fulfill 522.6.101 (iv) so what is it there for? It just hinders heat transfer from the cable.

I may be wrong.
Laurie

 

[GLENNSPARK]

whats this at #1 about refusing to nail channel over cables as `their RCD protected`?...lol....
since when has PVC/metal channel been classed as adequate mechanical protection from nails, screws and the like?...lol...

 

[dagrat]

The heat dissipation, and hence the current carrying capacity, of the cable clipped to the wall and plastered over is GREATER than a cable in conduit.
In my very humble opinion capping won't stop a nail or a drill bit so doesn't fulfill 522.6.101 (iv) so what is it there for? It just hinders heat transfer from the cable.

I may be wrong.
Laurie

Your quite right Lauriehurman, capping will not stop a nail or screw from puncturing a cable and is not intended to do so. Capping is purely a protection for the cables at the installation stage, to prevent any damage occurring prior to the completion of plastering.
Although there is a school of thought that suggests that it is easier to pull cables through capping if a later rewire is to be undertaken.
To be honest I don't often use capping anymore on smaller jobs, as I have never had a fault caused by the plasterers trowel to date. Maybe I've just been lucky:cool3:

 

[Amp David]

Laurie,

Have a quick read of post#9, pretty much says why capping is used.

 

[wade88]

Watch the stick i get for saying this.......

As a point of principle i always use oval conduit and screw it down with a repair washer top and bottom to hold it neatly in place.... ahh where is the little teachers pet smiley?!

But i do geniunely do that, yes it takes a little longer to finish the job, yes there is technically no need, yes its a pain in the ar$e, no it doesnt do me any favours, BUT and obviously its a big but because nothing should ever be going wrong with a new installed cable, but should that cable ever need changing/repairing/whatever, its a dream to pull it back out the chase and get a new one in it.

The next spark who comes along, will be singing your praises.... IMHO, it just makes for a more professional job...

TIN HAT

 

[Skyba]

Watch the stick i get for saying this.......

As a point of principle i always use oval conduit and screw it down with a repair washer top and bottom to hold it neatly in place.... ahh where is the little teachers pet smiley?!

But i do geniunely do that, yes it takes a little longer to finish the job, yes there is technically no need, yes its a pain in the ar$e, no it doesnt do me any favours, BUT and obviously its a big but because nothing should ever be going wrong with a new installed cable, but should that cable ever need changing/repairing/whatever, its a dream to pull it back out the chase and get a new one in it.

The next spark who comes along, will be singing your praises.... IMHO, it just makes for a more professional job...

TIN HAT

where do you work???

I'm going to come touting for work around your area in 15 years time could make myself a killing on speedy rewires lol