Cables in cavities

[ghost]

Many moons ago, when I was an apprentice, we regularly used cavities to run cables. Reading into this these days it is classed as a no no in exterior walls due to cavity wall insulation. Fair enuf.
My question is this, is it ok to run cables in cavities of party walls, ie, between 2 terraced houses as these do not get filled with insulation.
The reason I ask for some opinion on this is because I googled it and got a few conflictng views on the subject. The main reason being the cable is not supported, although, in my opinion, this would be true if we ran a cable in a pipe boxing too, ie the stack boxing.
The other query I have is in conservatory installs.
I have wired a few conservatories over the years. I like to keep all the sockets on the ring, I don't like to spur off one point and fuse down to 13A because 9 times out of ten in the winter a few electric heaters get plugged in and the fuse pops. I know a lot of people do it the spur method, but it's not a method I like to use.
Again, I have ran cables in dwarf wall cavities, is this now classed as a no no? Are people wiring this way still?
I would really appreciate some feedback on this one guys!

 

[Plonker 3]

So long as you take the necessary precautions, ie allow for it in cable calcs, there really isn't a problem with it.

Also some mechanical insulation wouldn't go amiss to protect against protection from vermin and holes being drilled through the wall.

 

[martysparky]

Also consider that debris could fall between the cavity.

 

[Hawk81]

surely cables in cavity walls are not running within the correct zones in the wall and if somone was to drill a hole in the wall they would not know the cable is there. that would be an awfull mess to try and repair.

 

[Des 56]

You do get opinions proclaiming thou shallt not do that sort of thing,they dont register too well with my own reasoning and practices though

As you say it was a regularly used install method
I think the only issue now different from the past is the insulated walls issue
To overcome any of those where it may be installed in the future,it could be run in flexible conduit and the support issue could be mostly overcome by securing at the top of the cavity and terminated into the back box
On conservatories,conduit in the cavity is probably the best method to install
Flexible conduit clipped to the inner skin of the dwarf wall and into the back of the boxes and wired as you go along

 

[rocker]

Have you ever tried to get a cable down a cavity with all the wall ties etc. I find it easier to chase.

Mind you, cable in a cavity is bound to be one of the few occasions where it IS more than 50mm deep, so where vwould we be standing with the RCD issue?

 

[martysparky]

I think the other concern is moisture in the cavity that could build up and run down cable into accessories.

I think its better to avoid cavities if possible but if not take all factors of possibility into consideration.

 

[monkeyelectric]

I think conservatories are ok as it looks very neat when there is no trunking about and the sockets are flush, but seal the hole behind the backbox to stop moisture,anywhere else i would'nt though