Suspended ceiling - how do you run lighting calbles ? ? ?

[mikex79]

Hi I need to run cables in a suspended ceiling (grid made of aluminium tees and mineral fiber ceiling tiles, suspention wires are fixed directly to the concret ceiling so there are not wooden beams that I could clip the cables to) the luminaires are already fit so what I need to do is just run the cables. What I have always seen was twin and earth PVC cables laid directly on the ceiling tiles and grid but I just have a feeling that this practice is not right there is something that is telling me that if there is an insulation fault even due to cable rubbing the main beam and tees the whole grid will become live.
My question is if there is any special method of suspending the cables so they will not touch the metal grid od should I clip them directly to the concret ceiling and just drop the cables to the luminaires? do the grid have to be earthed?
all suggestions would be much appreciate

 

[Spudnik]

i think one of the main reasons for keeping cables off the grid is because of the weight of them.

 

[joe kane]

There was an occasion in belfast where a fault developed on a ceiling grid with cables the ceiling fitter stuck to it.Nothing to do with weight.How can u earth a ceiling gid they are clipped together and give poor continuity.

 

[Spudnik]

Ther was an occasion in belfast where a fault developed on a ceiling grid with cables the ceiling fitter stuck to it.Nothing to do with weight.

READ MY POST.

I said ONE of the reasons.

 

[trebor]

Wire it up in Conduit,Wire armour,Trunking whatever to one of these or simmilar

Kilk - Lighting Distribution System Hager


Then flex drops to the fittings.

Hi Scott, ive not seen one of these Klik sytems before, I cant see forom the website the length of the prewired connections, as youve used these any info please

 

[scotsparky]

Trebor the prewired connection come in a veriety of lenghts but a coil of flex and the connections and you can make them whatever lenght you need. When i served my time in first year it was an apprentices job to sit and make them up.

 

[joe kane]

good job scotty but looks expensive.

 

[dkent5]

Trebor go onto Schneider Electric - Electrical Distribution and Automation and Control , I think thats the website but you can google schneider if you like. I normally buy the bare units and put my own flex on.

 

[adamh]

like some1 else said the easiest way is these black plug things (forgot there name) but you just drill a hole knock it in with a hammer and there is an eye for a cable tie to go through electricfix catalogue page 55

 

[Spudnik]

So how would we go about fixing to a fire resistant plasterboard ceiling above a suspended ceiling in a shop with flats above?

 

[adamh]

gripfill? lol

 

[sparks1234]

So how would we go about fixing to a fire resistant plasterboard ceiling above a suspended ceiling in a shop with flats above?

Use angle bracket screwed through the plasterboard into the joists

 

[Spudnik]

Use angle bracket screwed through the plasterboard into the joists

Not splitting hairs but i thought we were not allowed to penetrate the fire barrier?

 

[sparks1234]

Ah, how do they screw the plasterboards up then.....go on....

 

[Guest123]

They dont, they use sellotape.

 

[Spudnik]

Ah, how do they screw the plasterboards up then.....go on....

With those special fire resistant screws dont ya know.

Ok ill get me coat