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TBD. The total length of the circuits ranges from about 12m to about 18. (6mm is the longest) I had originally thought I'd just say 20m for all of them, until I looked into prices; now I'll put some effort into closer planning.
But in the ball-park of 9x4mm²@12-16m, 3x6mm²@18-20m.
Plan B - I had the idea of using all the colours of the rainbow for the 4mm² to make it easy to tell which circuit is which. If I abandon that and stick to Br/Bl I could buy 100m reels and try to off-load the part-reels on eBay.
If it's only 2 colours you need, that'll be a reel each of 6mm² and hope your 16 or 20m estimate is just OTT.
My experience of trying to sell reel ends on ebay is very poor and by the time postage is included itaint worth the effort.
Wow, I've just looked up some prices, last time I purchased tri-rated (circa 2018) I was paying average £8 for 1.5mm² depending on colour, now about 4 times that; £25 for 6mm² which I assume is ~£100
I was going to suggest buying 3 core flex instead but that's even worse, looks like I should be selling my extension leads.
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