When can cable NOT be run in conduit?

[EddieJT]

I am currently in the middle of a rewire, and chasing my concrete floors from one socket across the room to a planned other. Obviously the cable across the floor will be in conduit (electrician who is certifying my work said heavy gauge 20mm plastic conduit will suffice), but what about up the wall to the socket, particularly the 90deg bend from the floor to the wall. Is this wall part considered in the "safe zone" since it will be directly below a socket, and therefore not need conduit?

I am just a bit unsure at the moment how to neatly get my cable from the floor, and under the skirting board up to the socket if using conduit. Would be much easier to terminate conduit where floor meets wall, and then take it up again above skirting board?

 

[Chri5]

Cable could have been direct buried in to the floor and wall, but.........

If a jobs worth doing (and you might be around in 30 years) the sensible way is to provide a barrier / tube that will allow the cable mechanical protection AND ease of replacement at end of life cycle.

I'd suggest flexible conduit, or flexible barrier pipe. Regarding the MBR- minimum bending radius for the flexible conduit, did deeper in the sub surface nearer the floor to wall angle.

Before you suggest a box or termination at floor level, if it ends up buried then you can't do it, it must be accessable.

See date sheet for MBR

http://www.tlc-direct.co.uk/Technical/DataSheets/Other/AF20BS.pdf


If your not bothered about removal / replacement and your happy to bury cable hi tuf would be prudent due to double layer of protective sleeve.

http://www.tlc-direct.co.uk/Products/HT2dot5slash3.html

 

[stuartsjg]

just put a shallow angle 90degree bend at the end of the 20mm conduit
http://www.tlc-direct.co.uk/Products/MT20BNDslashS.html
and up the wall into the back of the socket, or nearby it.

Could be worth putting in an empty conduit allong side (with draw string through tho!) as in the future you may want to run a phone, tv, speaker etc cable.

If you use the flexible stuff, go for a larger size (25mm) as it will make cable pulling (esp 2 x 2.5T&E for ring main) easier as due to the ribbing the drawn cables can get cought easier easpecially when its not much more!
http://www.tlc-direct.co.uk/Products/BHEF25.html
http://www.tlc-direct.co.uk/Products/BHEF20.html

Stuart

 

[Lectrician]

Buy a spring a pull a bend! Don't buy the pre-fabbed nonsence!

 

[EddieJT]

That's a great help. Cheers guys.

 

[stuartsjg]

Buy a spring a pull a bend! Don't buy the pre-fabbed nonsence!

Too much hard work, anyway, i always get the spring stuck in the thing im bending!!

 

[Chri5]

Buy a spring a pull a bend! Don't buy the pre-fabbed nonsence!

Too much hard work, anyway, i always get the spring stuck in the thing im bending!!

Twist and pull, it's a spring

 

[Spark123]

Tie a piece of 6mm single onto the end of the spring so you can pull the thing out!

Under a wooden floor the pre-fab (non inspection) ones are quite handy - I have used them before as it would be almost impossible to do a bend in such a tight area.

 

[EddieJT]

How would those prefab corners join to the 20mm conduit. Do they just butt up to each other or do you need a joining piece?

 

[RF Lighting]

You just glue em on to the end of your tube