Trunking in Floor Chase

[phil_davison]

Alright,

Just a quickie, I'm currently doing an install in which involves chasing a concrete floor to run the cable for the ring main.
The chase is less than 50mm and will be rcd protected as well as being run in trunking. Can I run PVC trunking instead of metal trunking as the client is trying to keep the costs down?

Cheers

 

[Penance]

I'd be worried about it's strength.

 

[phil_davison]

Thats what my concern is.

 

[benji]

why not use conduit ?

 

[londonlec]

Or can you not run things above the ceiling and drop down, and run horizontally between accessories?

 

[phil_davison]

Cant run anything above the ceiling as its woodern beams london. I'd designed it all around metal trunking but, client is now asking me to try and save a few quid.

 

[londonlec]

To be honest I wouldnt be too keen even on using steel trunking. Or where you planning on screeding over the top?

I see the plumbers use a plastic duct which has a wooden cover. Maybe an option?

 

[jaresquire]

As Benji said, why not pvc conduit - that's what we do around my way?

 

[morph]

its got to be steal conduit if not in a cable zone or swa

 

[londonlec]

its got to be steal conduit if not in a cable zone or swa

Wheres the safe zones in a floor then?

 

[morph]

exactly thats why its got to be steel !

 

[morph]

Wheres the safe zones in a floor then?

silly question was'nt it ;-)

 

[londonlec]

Do you have a reg number please?

 

[phil_davison]

I've checked on-site guide and BS7671 and couldnt find anything mentioning safe zones in floors. Hence why I've asked the question.

 

[morph]

there are not safe zones in floors , nor did i say there were, i said unless in safe zones it would need protection

regs number ? book in van , but roughly 522.66 ish i think

 

[bugsy]

Use proper steel screed trunking

 

[jaresquire]

Now I think about it the floors I've been involved with have about 80mm screed. I believe the regs say the containment should be suitable for the intended use of the floor (522.6.4), the design in these cases being by engineers for large electrical contractors.

 

[morph]

Now I think about it the floors I've been involved with have about 80mm screed. I believe the regs say the containment should be suitable for the intended use of the floor (522.6.4), the design in these cases being by engineers for large electrical contractors.

the op did say at less than 50 mm, beyond 50 mm then yes suitable for intended use is fine .

 

[jaresquire]

the op did say at less than 50 mm, beyond 50 mm then yes suitable for intended use is fine .

This is why I should get more sleep at night!