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Would you fall in to part p? I could not give a definitive answer.
Is it normal to have 1 transformer per bulb?
lynx-
Would you fall in to part p? I could not give a definitive answer.
Not sure, my understanding is that like-for-like replacements aren't notifiable.
Notifiable works:
The installation of a new circuit
The replacement of a consumer unit
Any addition or alteration to an existing circuit in a special locationSince I reckon I need to replace the transformers anyway I could switch to low-voltage LEDs (the new transformers would need to be able to provide 4 or 5W, which halogen transformers can't), but it would be easier and cheaper to buy mains-voltage LED fittings with an integrated bulb.
Is it normal to have 1 transformer per bulb?
It's very common as far as I know, although you can have a single larger transformer to power several fittings. The advantages of one transformer per bulb are (from what I've read):
More of the cabling can be smaller diameter since the the high-current side from the transformer to the bulb is shorter
The transformers are nice and small so you can fish them down through the downlight holes to replace them.
There's a junction box at every downlight that you can wire a different fitting into (which is what I'm planning to do, just need to work out if I can switch to mains-voltage fittings).
ffm
My bathroom is currently lit by three 12V MR16 halogen downlights, each with its own transformer. Two of these keep blowing bulbs. I've checked that all the connections are screwed down properly and replaced the lampholders (because I understand that the heat from the lamps can weaken the springiness of the contacts leading to a dodgy connection to the bulb), but it's not improved things. I may have also replaced some of the transformers before (although I cant remember for sure).
What do?! Replace the transformers again or switch to mains-voltage, IP65-rated LED lamps. If the latter, is there anything I need to check before doing so and does anyone have a recommendation for a particular LED lamp?