Not all spotlights coming on - overload problem?

[tganning]

Hi,

I have just installed 3 GU5.3 12v 35w spotlights in the bathroom, but i can only get two to work at a time.

They are all connected to the same transformer which has 3 x 60vA outputs. I assumed that this meant I could put a single light on each pair, but as soon as i switch them on, they only have a very slight glow and the overload LED comes on.

When i remove anyone of the three pairs, the other two spring into life. If i then put that pair back in (while live), all three stay on. I am assuming that there isn't enough power to start all three from 'cold'.

The other thing is that I only measure 6v coming from any of the output terminal pairs. Could this be a transformer problem, or a supply problem?

Any help would be appreciated.

Thanks

 

[sparkwright]

Is the transformer part of a set with the lights, or did you buy separately?

 

[tganning]

Brought seperately from screwfix this morning. Everything is new.

 

[riveralt]

You need a bigger range on your transformer - but I think you have already worked that one out.
If its the Halolite 60vA then they suggest 35w lamp per transformer.
I always fit one tranformer per lamp - avoids losing all the lamps when the tranformer goes.

 

[tganning]

That was what i thought, but doesn't 3 x 60va mean i can put a 35w light on each of the 3 sets of terminals?

 

[sparkwright]

Are you certain it's not designed for three 20 w lamps?

 

[tganning]

the instructions clearly state 60w max per pair. Ive added a photo to an album on here if you can see it

 

[tganning]

hang on, it says up to transformer max. So that means all three can take 60w but must also add up to 60w as well. Right?

 

[333rocky333]

View media item 43515
60 max means any combination up to 60

an example would be three 20s daisy chained from one terminal pair and not using the other outputs

or one 20 from each terminal pair

Its a standard drawing used for up to a 180 va transformer 3x 60

 

[riveralt]

You need three transformers or one that has a range between 40/200w say.

 

[tganning]

Yes that's much clearer now. Thanks for all your help guys. I'll pick up some more transformers tomorrow

 

[ban-all-sheds]

I have just installed 3 GU5.3 12v 35w spotlights in the bathroom,

Were you aware that you needed to apply for Building Regulations approval before you did that?