Can't find Lighting Transformer

[Electron]

Just been on a "simple" job, changing 8 50w MR16 halogen downlights to (customer supplied) IKEA LED's (£3 each!).
Pulled out the 150W transformer that supplied the first set of 4 and changed these. The other transformer must be fixed into the ceiling void. I can't feel it and the void is full of rockwall insulation. Has anyone any ideas how to locate and remove the transformer without taking the ceiling down?

 

[telectrix]

can you get boards up above?

 

[Wilko]

As per Tel - sometimes there is a section of flooring above that's been taken up in the past to install the transformer. Murphy's Law is it's now under the bathroom tiles.

 

[Midwest]

The other transformer must be fixed into the ceiling void. I can't feel it and the void is full of rockwall insulation.

Not good for the transformer, covered in insulation. When it cooks, after you've finished, the customer will be blaming you.

 

[littlespark]

I hope the existing transformers are compatible with LED's. I've had experience with identical transformers where some LED's worked and others didn't. Had to change every trans for a driver over time.

Unlikely that the tranny is screwed down. Possibly just clips in the T&E supplying it

 

[plugsandsparks]

assume new leds are 240V ?. I have an inspection camera which i should in dark holes to see whats going on.

 

[Octopus]

I spent a couple of hours a couple of weeks back pulling an landing floor apart to locate 2 x transformers ......... customer not too happy

I'm going back next week to remove the transformers and re-run cables and convert the MR12 to GU10 LED's

My Top Tip for the OP - don't let customers buy products like that ..... or don't agree to fit them.....

 

[Midwest]

I have an inspection camera which i should in dark holes to see whats going on.

Filthy swine.

 

[Midwest]

Even SWD wouldn't resort to that...………..well like to think he wouldn't

 

[telectrix]

get the 12V transformer leads accessible. connect a flex to them. apply 240V and listen where the Bang is.

 

[Octopus]

OP - out of interest, did you warn them about "larger" transformers and the complications that then arise?

 

[Electron]

can you get boards up above?

Tel, It's a flat roof extension.

 

[Electron]

I hope the existing transformers are compatible with LED's. I've had experience with identical transformers where some LED's worked and others didn't. Had to change every trans for a driver over time.

Unlikely that the tranny is screwed down. Possibly just clips in the T&E supplying it

It probably is being held by clipped T&E although the transformer I removed has two screws for fixing to a joist. If, as seems likely, the lost transformer is the same type there is the possibility it has been fixed.
I think I will take the supply from the point it was attached to the transformer I removed and put new cable to bypass the lost transformer.