May a conductor be marked with a colour at its end?

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May a conductor be marked with a colour at its end?

Answer:

  • This is not allowed with 2- to 5-core cables, as the cores must be coloured over the entire length.
  • This is a MUST for cables with more than 5 cores, where the cores are marked with numbers and which are used as a neutral (marked in blue) or protective conductor (marked in green and yellow).

Rationale:

  • NEN1010:2020 514.3.1.1 Neutral or middle conductors shall be marked blue along their entire length.
  • NEN1010:2020 514.3.4 The designation of cores in cables with 2 to 5 cores shall comply with Annex 51.C. The phase conductors must be marked brown, black or grey over their entire length, the neutral conductor blue and the protective conductor yellow/green .............
  • NEN1010:2020 514.3.4 .............. For cables and cords with more than 5 conductors, each conductor shall be marked with colours or numbers as per NEN-EN-IEC 60445. Conductors marked with numbers and used as protective conductors or neutral conductors must be marked at each end with green-yellow or blue, respectively ..............