Morning fella,i did not say bunching could not generate problems,i never mentioned overlooking any regulations,or hinted at grouping factors being fun...
...and,talking as i was,regarding a domestic setting,i thought my analogy drawing similarities between groups of conductors being tightly constrained every 400mm by either a tie,or a notch,was a fair conclusion.
Having said that,to continue the debate,as permitted...i do concur with the bulk of your assertions :yes:
May i ask your honor for a short recess,whilst i consult my 15th Edition.
corrected that for you