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Are there are any regulations/guidance on the maximum weight that a luminaire can be if it is only supported by the plasterboard ceiling and not fixed to any joists or noggins?

I have a customer who would like a (heavy, but currently unweighed) light fitting from their old house fitted in the new one, but examination of the existing pendant reveals that it is supported only by a circular dry lining box. The dry lining box has words stamped on it something like the following: "Warning. Ceiling determines maximum load. Max 3kg". Does this 3kg come from some official guidance or is it just something the manufacturer of this particular dry lining box has come up with?

The plasterboard is 15mm thick and the mounting bracket for the wanted light is wider than the dry lining box so the fixings would be into the plasterboard rather than using the dry lining box. The room above has a laminate floor so I have no access from above, only through the 70mm hole that has been cut out for the dry lining box. Potentially, I could feed some strips of ply into the hole to try to spread the load and then put wall anchors or similar through both plasterboard and ply, but at the end of the day it is still just the plasterboard that is taking all of the weight.

Is this job feasible or must the customer be restricted to lightweight fittings until such a time as the ceiling can be reinforced properly?
 
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