Correct, but would you say a DIY'er can be classed as a "competent person" in the electrical industry, and abide by what it says in the 17th edition regs? Nope
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depends on the industry, domestic application a monkey in a waist coat could do it with little training or reading a book, Industrial maybe a ape.

there is nothing hard or magical about domestic application, hell all the wiring sizes now comes with with current rating. so the worst you have to do is use the power equation to work out current draw. but in 99% of applications 2.5mm for power circuits, 1.5mm for lighting and either 6,8 or 10mm for shower and cooker circuits.
