Discuss 1st flats with concrete ceilings in the Electrical Forum area at ElectriciansForums.net

B

Bellendian

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Looking at a job first fixing flats with concrete ceillings, to be lined with mf ceilling system.
How do you guys support cables in this scenario? Just clip up to concrete, or some more elaborate solution? Tray seems kind of ott, but would be a good solution. Cheers
 
C

cliffed

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Could use all band,you can also get upside down like c shaped clips ,drill a hole & this clip fits in,it’s plastic,& 2 sides to it,try & get pic for you.
 
Joshua

Joshua

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I use one of these, makes it a doddle
I've just got the newer version but this one is just as good. Now I'm retiring the old one to gather dust in my garage.
 
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B

Bellendian

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Cheers guys, might end up with a combination, maybe a central spine of basket, then use the plastic clips for individual drops. Think I've seen some clips in wholsaler that just knocked into a pre drilled hole. Presumably they dont need to be metal since it will all be protected by ceilling once job is complete?
 
rapparee

rapparee

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Cheers guys, might end up with a combination, maybe a central spine of basket, then use the plastic clips for individual drops. Think I've seen some clips in wholsaler that just knocked into a pre drilled hole. Presumably they dont need to be metal since it will all be protected by ceilling once job is complete?
You are talking about crampets I think.

I take it that you will be using twin and earth
 
MDJ

MDJ

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All round band is what is normally used, not sure I like it but it is very common.
 
L

LankyWill

No fixings needed just tie a brick to the cable and sling it across the metal ceiling top hat, there’s your fireproof fixing free of charge.

(Just kidding, all round band works a treat)
 
D

Deleted member 26818

I worked on some luxury flats near to Vauxhall bridge.
All cables were fixed to the ceiling using knock in cable tie plugs and then cabled tied every 250mm.
 
T

Toneyz

Depends upon where sockets are etc when I did some flats with concrete slab above clipped most of the ring around the perimeter on the wall above the ceiling. The main spine of wiring as Lee posted.
 
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Gedh

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I've used p-clips and metal cable ties on jobs in past. Depending on size of void you'd probably need to work out if any pipe work / ducting going in same gap and try and keep your routes away from them. I've burnt through a ---- ton of sds bits doing concrete ceilings as well
 
Jamie'

Jamie'

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Spit gun/Hiti gun, a lot quicker then drilling a hole and knocking in a cable hook, also a lot quicker then throwing up some basket as by time ducting and plumbers pipes gone in there would be hardly any room anyway.
 
C

cliffed

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Do you need to use metal clips,does the ceiling count as a barrier,I dint think so according to 18th.
We are going all the way back to the days of metal trunking/conduit,not a bad thing.
 
D

Deleted member 26818

How many layers of plasterboard are going up?
How about metal cable ties every third fixing?
 
Big Man
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Sorry to invade this post. Just a variance on the above... same situation apart from the plasterboard ceiling is up plastered and painted in a relatively new apartment. Customer wants light switch moved to opposite side of room as it’s currently in a silly place. 6m across room assuming it directly opposite. What do other people do to meet regs in this situation? Metal fixings and a load of large holes cut out the ceiling? It makes for a great fixing for the entanglement/ premature collapse issue but kinda messed up the fire integrity of the plasterboard ceiling. Any thoughts gratefully received also.
 
Big Man
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Sorry to invade this post. Just a variance on the above... same situation apart from the plasterboard ceiling is up plastered and painted in a relatively new apartment. Customer wants light switch moved to opposite side of room as it’s currently in a silly place. 6m across room assuming it directly opposite. What do other people do to meet regs in this situation? Metal fixings and a load of large holes cut out the ceiling? It makes for a great fixing for the entanglement/ premature collapse issue but kinda messed up the fire integrity of the plasterboard ceiling. Any thoughts gratefully received also.
 
Big Man
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Quinetic switch
Thanks for the prompt reply. That was one thought. Customer wants original 3 gang switch removed and plastered over also dimmers in new position. So a cable run will be required. Historically people would have just pulled the cables through but with the premature collapse issue I just wondered what other people were doing in similar situations.
 
Big Man
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Linian clips. Brilliant invension.
I agree they are. My problem/issue is the multiple number and size of the multiple holes. It’s a big hole needed to fit an sds drill/hand/hammer into the void to drill the reinforced concrete. Bearing in mind it’s a 6m run that’s a lot of holes in their new ceiling. 😬
 
Paignton pete

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I agree they are. My problem/issue is the multiple number and size of the multiple holes. It’s a big hole needed to fit an sds drill/hand/hammer into the void to drill the reinforced concrete. Bearing in mind it’s a 6m run that’s a lot of holes in their new ceiling. 😬
Large linian clip. The bigger SWA ones can fit several smaller twin and earth cables in one loop. Run them along in one go.
 
ipf

ipf

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Used these many a time in the past but I don't know where you can get them these days. We knew them as Obos (obows, oboes?).
One fix, as can be seen, and an open/close clip....about 75x40mm. great for small bunches of cables above ceilings. I think they do some metal type's too.

IMG_2271.jpg
 
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pirate

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Big fan of Linian clips here. They have just introduced clips for fibre cables too.
Drill a hole, tap them in...job done. 1.5 and 2.5mm are so easy and fast to use, and the bigger sizes do SWA and conduit.
 
Mike Johnson

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Is it a structural ceiling, what cover is on the reinforcement, do you have enough information to ensure you are not compromising the structural integrity of the floor above?

Do you know if the concrete ceiling is a pre-stressed member, or a post drawn area of a main structural element of the building, do you have the structural engineers drawings?

Any fixings in a regular pattern is like putting in a zip for a stress fracture to form, do you really think you are competent to make these structural decisions without taking into account the introduction of a path for moisture/condensation directly to the reinforcement.
 
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telectrix

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Is it a structural ceiling, what cover is on the reinforcement, do you have enough information to ensure you are not compromising the structural integrity of the floor above?

Do you know if the concrete ceiling is a pre-stressed member, or a post drawn area of a main structural element of the building, do you have the structural engineers drawings?

Any fixings in a regular pattern is like putting in a zip for a stress fracture to form, do you really think you are competent to make these structural decisions without taking into account the introduction of a path for moisture/condensation directly to the reinforcement.
would gorilla tape compromise the structural integrity, glue dissolving the concrete? 🤣
 

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