Technical Documents - Colour Codes


JB, OB, JZ & OZ

Below is a breakdown of the 4 different types of colour coding using J, O, B & Z codes.

J = Includes a Green/Yellow Earth Conductor

B = Colour Coded Cores

O = Without a Green/Yellow Earth Conductor

Z = Black Cores with White Numbering (Number Coded)

  • As an example, a 5core cable has 4 number coded cores and 1 Green/Yellow core.
  • A 12core cable has 11 number coded cores and 1 Green/Yellow core.
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