Swa in warehouse chased into concrete floor

[robo83]

Hi,

Had a look at a job today and there is an swa swinging from one side of the warehouse to the other providing power to machinery.

They have had another electrician quote to chase the swa into the concrete base. I can't see how he can chase any deeper than enough to cover the swa.

Where do we stand regulation wise, as my approaches was to fix a cross beam across to support or run around the warehouse to the machinery.

 

[telectrix]

i'd fit some tray round.

 

[Pat H]

Or use a wire to hang the cable from?

 

[robo83]

If I run around the building it's a lot of work and all high level.

I could get a crossbar braced to the wall and a support leg bolted down to the floor. That was my other approach.

Could I clamp support wire high level lowered down and the cable zip tired to that, of course the wire would be clamped and tight both ends.

 

[telectrix]

why high level when you've posted the option of burial?

 

[LankyWill]

You could girder clip it across the factory, get a mobile lifter in. Tel's approach with the tray would also work well. Grinding the floor is a bit overkill, what size is the armoured?

 

[onions1066]

How long is the chase in the floor compared to going round in tray?

 

[swl83]

I wouldn't recommend digging up concrete in a warehouse, for lift trucks are heavy things may damage the cable if its in the floor!!!!!!! plus most of them are full of rebar with a smooth screed on top which isn't that strong.

 

[robo83]

Thanks for reply.

Chase along the floor maybe 8meters. Running around warehouse around 50.

The swa is 10mm

 

[LankyWill]

Hardly a struggle to pull that in across a bit of tray, I wouldn't grind the floor as others have said due to depth and further complications.

 

[onions1066]

See I'm not sure depending on loading of traffic going over and difficulty of running tray with route. Without seeing too hard to say really

 

[PEG]

Once you have chased out the floor,how would you fit the SWA? ...just out of interest

 

[The Ghost]

Does the cable height meet regs? Or even what height is it?

 

[davesparks]

Does the cable height meet regs? Or even what height is it?

Are there any regs on what height a cable should be inside a building?

 

[PEG]

I recall it being a minimum of 1.1 meters,when i worked at that chocolate factory...

 

[westward10]

I recall it being a minimum of 1.1 meters,when i worked at that chocolate factory...

I have absolutely no idea why that made me laugh.

 

[onions1066]

I have absolutely no idea why that made me laugh.

I've missed something but he isn't referring to catenary suspended at that height is he?

 

[telectrix]

bury it in the concrete in some 25mm galv. conduit. (earthed conduit of course ).

 

[The Ghost]

Are there any regs

Only in respect to having regard to environmental influences such as fork lift, or under a roof which admits light from the sun causing uv or heat problems. I would say the height would meet regs if any such factors had been taken into consideration. There are no specific heights mentioned (to answer your question) in BS7671 regards cables indoors, however as I say a judgement would have to be made to ensure the height chosen avoids external influences to it which may cause danger or damage.

 

[davesparks]

I've missed something but he isn't referring to catenary suspended at that height is he?

He certainly is, in a chocolate factory, which we all know are staffed entirely by Oompa Loompas