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Thanks I think it is a built-in emergency light because when I switched the MCB from mains one of the tubes was still lighting. But how do I replace it with an LED panel

Hi I am replacing a commercial fluorescent tube light fixture with a LED panel on a suspended ceiling. I've done a few which were simple connection but noted one of the fixture is connected with a 3 core plus earth cable. The black wire is mentioned on a sticker with a warning as an unswitched...