If you are communicating with a person who puffs out his cheeks and says that he is perfectly familiar with the screens cross-bonding of single-core high voltage cables, then ask him next simple question – “What is the difference between two types of screens cross-bonding shown on schemes (a) and (b)?”

There is type “123-312” (a) and type “123-231” (b). If a person answers you that schemes are the same, then this person should not be an authority for you. These two kinds of screens cross-bonging are different. It is a pity that there is not a word about this in the cable catalogs of leading companies. Also there is nothing about it even in the IEC standards.