I was brought up (under the 15th) to believe that if you installed a dedicated radial like an immersion heater circuit, a shower or a cooker, that no additional CUE could be added to that circuit.
Then when the 16th came along, I considered that these circuits could have additional CUE added (although the OSG, not the regs advises not for IH's) as long as it is done with cable of the same csa.
Now the 17th has introduced this reg allowing a reduced csa under certain circumstances.
OK, I shall consider myself dragged into the 21st C....
I can add it to my creaky knees and spine & look forward to retirement!
They do say there's nothing wrong in exceeding the requirements of the regs.
When visiting houses I shall be aware of that, as I have previously highlighted circuits with undersized cable on them as unsafe, but for me personally, I shall continue with my 15th Ed. thinking, in that respect at least.
no, because if you look at the other picture of it, it shows it as extending lower than the back box at roughly the level where the terminals are.. as shown by the red box I've drawn on it to show the boundaries of the back box..
But now imagine it without one of the outgoing cables, and consider the space under the cover - it doesn't look to me as though you definitely couldn't route singles back up inside, and then off to the left or right.
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