1.5mtrs springs to mind from somewhere.
all depends on how far the light is from the click rose.
From memory it's 2 or 3 metres. I don't know if it's the same reg but there's one which states a maximum length of cable which can be used where the csa of the cable is reduced, without fusing it down.
The fitting is supported by a ceiling grid. I could swear that there is a reg that stipulates the max length.
Well seeing as you are doing electrical work you have a copy of the regs.
You now have two options either understand the regs and find it yourself, or find a job that you know what you are doing when given a task.
Please can no one ever ask a question on this forum again!!!
how helpful...... Not.