PJK
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BS7671 at 526.5 advises all terminations and joints to be made within an accessory or an appropriate enclosure, this means fitting a light will require the connector block, wago or helacons to be placed inside a round dry liner, wago box, steel box, in the dome or body of the light or similar. Really difficult when you are just asked to put up a new light, especially when there will likely be wooden grounds in the way. Most customers will not want you cutting holes in their ceilings. If the light is on a ceiling downstairs this could mean lifting floorboards above to fit the enclosure to house the connections. A lot of hassle and expense to fit a new light. But seems to me necessary in order to comply with the regs. I just completed an NICEIC inspection and the inspector did check to see how my recessed lights were terminated, luckily they were in wago boxes.