Conduit Support

[Guest111]

The beams may not be holding the roof up but may be to stop the structure splaying outwards,either check that its acceptable to drill holes in it (25mm for 20mm conduit) or get the owner to give you something in writing saying that they are happy with it done that way otherwise it may end up costing you a lot more than you make,be carefull

 

[somersetsparks]

The beams may not be holding the roof up but may be to stop the structure splaying outwards,either check that its acceptable to drill holes in it (25mm for 20mm conduit) or get the owner to give you something in writing saying that they are happy with it done that way otherwise it may end up costing you a lot more than you make,be carefull

Indeed, most big jobs I've been on specify that you cannot remove metal from an rsj, however you can drill, tap and bolt to them.

 

[Engineer54]

Indeed, most big jobs I've been on specify that you cannot remove metal from an rsj, however you can drill, tap and bolt to them.

That specification clause normally comes with a proviso, '' Unless otherwise agreed and authorized in writing by the project 'Structural Engineer''. 9 times out of 10, i've never had a problem with getting authorisation, the cluase is there to stop the numbties chopping lumps out of structural steelwork etc.... lol!!

 

[somersetsparks]

That cluse if for the minions like me engineer, also saves the apprentice going through 3x 4" holesaw tring to go that bl**dy ducting through that girder - it was the easiest we thought! lol

On a serious note though we have rarely had issue drilling RSJ's with permission, only once or twice on older refit jobs where they have already been peppererd!

 

[Duncan Bennett]

The very fact that the plastic conduit is running at a touchable height means I'm going to fix it to a plate; the gaps are just too wide and the conduit to flexible for me to be happy with it only being supported by the steel framework.

I also take on board the concerns re - hole-cutting the structure. As Engineer54 suggests, I don't think there would be a problem drilling the steelwork - it's actually pretty pliable, and I think it's only there to fix the plasterboard wall too - but, in future, I'll ask permission first; good advice.

Thanks, all, for your input

 

[malcolmsanford]

Looking for some advice if anyone can help.

I've been asked to install sockets in a new build business unit. The company deals with software imaging - lots of computing power but no machinery, tools, etc.

The place is pretty much a standard build with a number of heavyweight vertical RSJ's cross-hatched with U-shaped, mild steel beams onto which a potential plasterboard wall could be fixed. The client is leaving this open, though, so I was hoping to hole-cut through the steel beams and run a 20mm plastic conduit through from one end to the other in an L-shape from the CU on one wall a total length of around 20m.

I'm running a radial circuit for four twin sockets as they are all being placed on this one run. Trouble is, the regs say that rigid plastic conduit has to be supported at 1.5m intervals for a horizontal run, and there's approx. 2m space between these. So, i'm considering fixing a 3x1/2" wooden plate along the length of the wall on top of the steel uprights and then fixing the conduit to that. Steel conduit or tray are options, but I'm trying to keep the price as keen as I can. Can anyone suggest another method?

Thanks

Must be a new regulation that as it is not in mine

Also as you say that this radial is going to be provided for IT equipment do you think that your radial design of 4mm conductors and I assume that is a 4mm CPC and not perhaps even a 2.5mm is perhaps the best

 

[Duncan Bennett]

Must be a new regulation that as it is not in mine

Also as you say that this radial is going to be provided for IT equipment do you think that your radial design of 4mm conductors and I assume that is a 4mm CPC and not perhaps even a 2.5mm is perhaps the best

I was intending to run 4mm singles, Malcolm. As for the supports, I'm quoting Table D3 in the OSG.