MBN LV 124-1 shows how the joint requirements of the German industry are taken up by an individual manufacturer: where several companies have agreed a common standard, each of them may issue its own numbered document that adopts the common text with the additions or clarifications its own engineering requires, and the document then carries both the manufacturer's prefix and the name of the common standard. For a supplier the consequence is generally convenient, because a component qualified to the common standard is close to qualifying for the manufacturer's variant as well, but the differences have to be established rather than assumed. The document covers the electrical rather than the electromagnetic behaviour of low-voltage components, that is the supply conditions, the transients and the abnormal operating states of the conventional vehicle installation.