12.2.5.1 Multicore cables
Each multicore cable should have an identification number; in addition, every
conductor in each cable should be numbered. It is useful if the numbering of
multicore cables is carried out consecutively by voltage level. With this in mind, an
ample range of numbers should be provided, for example, multiples of 100 for each
voltage level, thus ensuring that there are sufficient spare consecutive numbers
available for any additional cabling in the future. All the conductors in the wiring
diagram should be marked at each end with the location of the far end of the
conductor.