Not sure how me last thread went down

[tri cal elec]

but if anyone can help me solve this little problem Id be greatfull

Light needed in a room

-Drilled into concrete ceiling and put what I have no idea what it was called now into the whole. Found that the 8 ml drill bit the matey said id need was a bit of a tight fit to get this raw plug shall we say into.
anyway after getting it in, with a hammer! I had to punch the middle of it so that it splayed out. someone will know what there called im just trying to describe it. did that threaded me m8 i thnk he called it bar into it, for a good few turns then put a washer on top with a nut to hold it.

took the light drilled out a 8ml in the centre threaded a nut up the m8 bar, popped the light on and put another nut on the inside to hold it. drilled another hole into the side of the light and put a glad onit for the cable to enter. prob is im finding it wobbles and sways like a barstard, id say the drop of the bar is 1.5 m

I think onother bar dropped down would steady it. perhaps you can buy some sort of clip/clap that can attach to the m8 bar and a random pipe that just so happens to be there for it to grab onto which would be more ideal as its a bit of a tight gap to drop another bar.

anyone wanna say what they would have used/done?

 

[tri cal elec]

I assume the fixings are drop anchors?

hello mate yeah that the one. do you bang that with a blunt object to splay the end out if so its deffo that

 

[tri cal elec]

I hope one rawl plug is not the only thing holding up your light bar.
You do not use rawl plugs in this fashion
You need proper masonry anchors
like this -

not like this -

this is a rawl plug.

sorry mate ive confussed you

 

[tri cal elec]

Just one rod per fitting? M8 is very flexible when it's 1.5M long! What are the light fittings being installed?

yes mate first time doing an install in this sort of enironment. The lights a led bulkhead

 

[tri cal elec]

So you have mounted a light fitting by suspending it from a 1.5m threaded rod that is screwed into concrete with what sounds like a wedge anchor.

You will not be able to prevent the light fitting from swaying.
Even using two rods (which would be sensible) will only prevent swaying in one direction it will still sway from side to side.

Potentially you could install stay wires to the light from various ceiling points as they would not require much holding force but this would look terrible.

yes mate i have

I have pipes that I could attach to, weather or not you can get something that can grip the m8 bar and then clamp on to a water pipe I dont know

 

[tri cal elec]

Drop-in Anchors | Brackets and Bolts - https://www.bracketsandbolts.com/shop/?cid=74

As others have said, you've got no chance of it being steady with only a single 8mm fixing of that length.
Drill size should have been 10mm so your anchor is probably loose in the concrete.

Is this in a House / Flat /Apartment or Commercial?

You'd have a slightly steadier light with 20mm steel conduit dropped from the ceiling.
Or maybe 3 drops of Gripple.
Cable Tensioner - Construction - Standard Hanger | Gripple - http://www.gripple.com/gb/en/p1/a14/standard-hanger

I found that using a 8mm drill bit to drill the hole for the drop/wedge anchor I was given made it a right tight fit. so much so i had to use a hammer to encourage it in. It just didnt feel right but i got it in. I was thinking maybee i needed a 9mm drill bit if i had used a ten im sure it would have just dropped out but the again thats probably the point of the splays. I was never shown so Im sort of learning here.

what your saying is that with a m8 anchor your supposed to drill a 10mm hole and then put it in and give it a ---- to sply them bits out which will give it a nice tight fit.

if thats the case nice one, ill apply it if i ever use m10 or m6

 

[tri cal elec]

Normally suspended fittings are done with jack chain and they could swing around. And a galvanised hook plate on the ceiling. Don't suppose anyone's gonna get up there and swing on it so doesn't seem there is a problem?

cheers for another option mate. I guess it is doing its job and if anything has some flexability in terms of being able to move it about but if it was in my garge id sooner it sturdy and I wondered if I had missed a trick but it seems physics said it would wobble

 

[tri cal elec]

You won't stop a suspended fitting from swaying unless you anchor it in at least 3 points (as Richard Burns explained)^^^^^
But if you wanted to reduce that sway then a thicker rod or conduit maybe be as snow head mentioned. Also the size and weight of the fitting will play a part.

If the concrete anchor fixings are installed correctly and the concrete is of good condition these type of fixings are usually quite good and take some shifting once in place. Its important you use the correct size drill bit for the job, too small and you won't get the fixing in with a big hammer which is likely to damage the fixing. Too big and the fixing will not expand enough to grab the sides of the hole and will easily slip out under load.

thanks mate I did think the only way to gurantee it was sturdy would be with a triangle i think the m bar only goes up to m10 but im not 100 per cent on that. if I used conduit how am I gonna attach it to the concrete ceiling. If I used a 20mm bit of conduit say then id need a 20mm anchor can u get 20mm anchors. the thing witht he m8 bar and the anchors was that it literally threaded into it. conduit has no thread and ive never worked with the stuff but i know you can put a thread on it but ive never had anyone show me that although I dont mind getting all the bits to do it

I did have to hammer the anchor in as it was so bloddy tight. not pround

now i know that a 10mm anchore needs a 12mm drill bit and i should have used a 10mm drill bit for the m8 bar i had

 

[tri cal elec]

Hi dude,i hope the flat above,hasn't got a lump in the carpet...

I am not trying to cause alarm,but if you are unsure about fixing types and methods,i would refrain from perforating what could be a structural or service containing section of building.

Or,if not concerned,drill right through,and ask the folks above to thread that M8 nut on...

lol