Two cables from the shield to the junction box
Will it make sense if you combine two cables with a cross-section of a core of 2.5 mm.sq.? For example, use two cables, like one for the trunk from the shield to the distribution box? Will the power increase?
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If you connect two wires in parallel, their cross section will be folded and will be 5 mm.
This tandem can withstand double load. This is sometimes done, but it is not right and expensive in material terms.