Wire gauge for low power transformer

[john2k]

I have the following transformer (pictured below) which is for an infrared touchless toilet flush system. It’s input power draw seems relatively low. I have a storage cupboard outside the bathroom with a fused spur that has supply but hasn’t got anything connected for the load. It was put there as part of the new-build back then for installing alarm system. I’m am thinking to take a wire from the load of this fused spur place into the loft and place this transformer in the loft and then that way it’s out of the bathroom.

My question is could I use 1mm2 wire from the fused spur load to this transformer? Since the transformer only uses very little power? And possibly put a much lower fuse in there to protect the max of the 1mm2 wire?

Thanks

 

[Taylortwocities]

1mm conductor cable will be fine. Put a 3amp fuse in your FCU

 

[davelx]

The whole thing needs to be in an enclosure - you should not have single insulated wires or those connectors just lying free in the loft.

 

[john2k]

The whole thing needs to be in an enclosure - you should not have single insulated wires or those connectors just lying free in the loft.

So put the entire thing in an enclosure maybe like this? https://www.toolstation.com/ip55-junction-box/p70316

And make sure the transformer itself and the connections are all inside the box ?

 

[Taylortwocities]

So put the entire thing in an enclosure maybe like this? https://www.toolstation.com/ip55-junction-box/p70316

And make sure the transformer itself and the connections are all inside the box ?

Of course. Make sure the box is big enough, and sort strain relief for the cables.

 

[morqthana]

Make sure the box is big enough, and sort strain relief for the cables.

Looks like it would fit into a Wagobox XL. Strain relief sorted.

 

[JohnW2]

Interestingly, it is labelled as a "Class 2 Power Unit", and is CE marked, but does not bear a Class 2 symbol.

 

[john2k]

Interestingly, it is labelled as a "Class 2 Power Unit", and is CE marked, but does not bear a Class 2 symbol.

From what I’ve read, the confusion comes from “Class 2” meaning different things. In this case it’s Class 2 in the power-limited sense, not Class II (double-insulated). A Class 2 power unit just means the output is limited to a low voltage and low power level that’s considered inherently safe, so it can’t deliver enough energy to cause shock or fire.

The double-insulated Class II marking is about how the device is constructed internally and uses the double-square symbol. Since this unit is being labelled for its power-limited output rather than its insulation class, there’s no Class II symbol to show, even though it’s CE marked.