Shattering capping

I use galvanized metal. Plastic is always going to shatter because its brittle.

 

I use oval conduit now. Did use metal but now it would come under the "a cable concealed in a wall or partition the internal construction of which includes metallic part" this it would seem is going to change a bit with amendment 3 but I did not want to be limited by the includes metallic part rules so avoided and metal covering which did not lend itself to being earthed.

 

Not so, MGW. This has never been the case. Not even with the new AMD3. The metal capping is not part of the wiring system, its just a cover. The internal construction refers to the cable itself, say like an SWA. Metal capping doesn't need earthing either. This was debated at length when 17th edition was first published. I use it all the time.

Regards

 

Earthed metal capping has never been acceptable for dispensing with an rcd for buried cables.

 

Never use it. Cable under dot and dab walls needs no capping - Just clip tightly to the wall.

In chases, oval conduit, held in with drywall screws and red plugs (not screwed through).

 

Never used oval conduit. I'm used to galv capping; it is straightforward. Even behind dot-and-dab. I use red plugs and large head clout nails to pinch the edges to the wall.

 

I don't often use capping or oval conduit, just plaster straight over, there again I always plaster my own chases in, I don't risk plasterers slicing my cables with their trowels!

 

Have a bradawl handy to make a hole first. Pointed with square shaft.

Mr. HandyAndy - Really

 

I've always use galvanised capping, it may be a bit more expensive than plastic, but when doing a job the cost is minimal.

the advantage of using metal trim is that once plastered you can use a magnet to locate the wires etc.

 

Coming on here with your new-fangled and fancy la-di-da ways.
Who d'you think on here can afford one of those all-singing and dancing bradawls then?
Batteries in it probably don't last a minute either.

Makes my blood boil, it does.

 

To answer the OP:

With the majority of my work (say 80%) I don't use capping as I work with the same team of plasterers the whole time.

When I'm carrying out work and leaving it to others to plaster (ie customer is using a builder that I don't normally work for but has asked for me to do the work as they're previous customers of mine) then I cap or oval tube.

With capping into light block/soft brick/soft mortar it's just screw into wall with drill/impact driver (doesn't crack it IMO). Or heavy brick, then as per UP - plug and clout nail. Oval likewise, but held with angled screws.

 

He's not saying that it's part of the wiring system.
He's saying that using metal capping is the same as having metal studs in a partition wall.
As to what difference that would make, is anyone's guess.
Use of oval conduit would still require the cables to be provided with RCD protection.

 

So do you think that using metal capping is the same as having metal studs in a partition?

 

The Emma Shaw Case (Google it) was down to metal studs. And that in large part brought in the Schemes and 'Part P' Notification'

Metal studs by default reach down to floor level from ceiling (and extend the whole length of wall section) , which is why she unfortunately died when that section of wall became live (mopping water up from floor).

I myself don't see how a length of capping in a wall constitutes such a risk as large as that of metal stud framework.

But I don't see why metal capping should be used because of the number of cases I've seen of jagged edges snagging sheaths, sections of wall made live by homeowners putting pictures etc up (no RCD, older installations). Plastic capping obviates these risks.

I always double over the ends of a metal capping to give a smooth edge so snagging can't possibly happen (It can be a matter of weeks before the plasters get in on some jobs after my 1st fix, and alls orts can and do happen to how the cables were as I left them in that time.) Plastic capping is so much easier.

 

Emma Shaw's case had nothing to do with Part P.
Her death occurred after Part P was introduced.

 

My bad... Friday night. Mary Wherry Case, badly routed cable. Apologies.

 

I think there was another case, some workmen drilled into metal studs through a cable and some bloke got fried fitting a door. I think the cable was even in a permitted zone. I think.