Re-wiring a sailing boat - cable colours and standardised guage

I used the 50W deck floodlight as an hypothetical power requirement. I have an LED of 10W at the crosstrees IRL.

I am still undecided, in view of conflicting experienced-based advice about "multi-coloured" vs "red and black" wiring strategies, about which way to go. However, a possible hybrid solution of a 'ring main' using tinned 7 core lorry standard as a 'spine' with spurs taken off for e.g. bow nav lights, cabin deckhead LEDs, water pump, etc, is under investigation.

I think I have found tinned 7 core of acceptable rating

BRITISH MADEOCEANFLEX TINNED 7 Core CableTINNED Copper cored cabling (altecautomotive.co.uk)

and need to work out how to tap into the core effectively to run spurs locally. Using a spine would save lots of loose wiring runs,, though care, as recommended above, is needed for accumulated heating . Presently working on a colour scheme based on the ABYC system, which is needlessly complicated for my simple sailing boat.

ABYC system !

ABYC colours.jpg
 
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