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Yep. Almost immediately on powering on.

Fitted Tuesday afternoon, lights have survived since then.

Update. After some email dialogue with the lighting manufacturer, a 5uF capacitor across the transformer secondary has fixed the issue. No buzzing or failing lights. Thanks all again.

Yep, although there is no neutral easily available.

The fittings have failed with nothing else starting or running, either on this equipment or elsewhere in the building so I think I'm ruling out voltage spikes or variations. I might look at what filtering I can fit after the transformer, and give the transformer supplier a call, might be a...

Could you expand on "in a way" at all, please?

https://www.ete.co.uk/product/transformer-380v-480v-to-110v-or-220v-50va-wide-input-voltage/ The project is modifications to an existing piece of equipment whose existing supply is TP + E..

Yep. Measured 230V at each light. Lights are controlled by a contactor.

http://redarrowtrading.com/300w-smd-ac-floodlight-photocell-6000k-black.html

On a project where I have got 8 off 300W LED fittings on a radial circuit from a 400 to 230V transformer. The fittings are 230V supply, and keep failing either straight away or after a short time, except the one nearest the transformer, which is fine. The fittings also seem to hum, so maybe a...

Do we try to guess what those suggestions are? RCD protection?

I'm guessing there are regulations for electric gates, and that you have a duty of care to people using the gates, and that lashing a panel from a roller shutter door onto the gates without the appropriate safety devices and design doesn't quite meet those requirements. I've no doubt I could...

Is there not a requirement to comply with 552.1.2 in the yellow book, or does the motor have built-in overload protection? Just asking, I don't know for sure, although I would assume there is a requirement to comply.

I have Ei smoke detectors, rest assured, you would struggle to sleep through them :)

If you're putting that amount of work in, fit a separate test and alarm silence switch.

I would have thought they are all equally effective. You're overthinking it, it's smoke, it will drift around in the breeze...

Also 50 or 60 Hz depending on where in Japan you are.

Yes, 200V p-p

Off-topic.....Currently working on a project with 3 phase + N + E blue c-form connectors.....didn't even know they existed prior to starting the project. The project is in Japan, where mains supply is 200V three phase, either 50 or 60Hz depending on location.

I would think it cheaper to patch up the ceiling and fit a pendant than buy more downlighters. A bit of plasterboard, timber, filler and white emulsion.....job done. Probably some MF boxes too.