BS 6004:2012 pdf free.Electric cables – PVC insulated and PVC sheathedcables for voltages up toand including 300/500 V, forelectric power and lighting.
BS 6004 The cores of all cables shall be identified by colour.Each core shall be identifiedby its colour as indicated in Table 3 to Table 6.NOTE Other colours may be used by agreement with the manufacturer; in this casethe requirements in 11.2 do not apply.
Core colours.The colour shall be applied throughout either the whole insulation or the outercohesive layer and shall be applied as part of the extrusion process.
The insulation of the coloured cores, irrespective of the method of colouring,shall be tested as a complete single layer (see 7.2).
The colours of the cores, determined by the number of cores in the cable,andalso the sequence of the colours shall be as given in Table 3 to Table 6.Wherealternative colours are used (see 8.1,Note), the sequence shall be agreed withthe manufacturer.
On a core with the bi-colour combination of green-and-yellow, the distributionof these colours shall be such that for every 15 mm length of core one of thesecolours shall cover not less than 30% and not more than 70% of the surface ofthe core, while the other colour shall cover the remainder of the surface.
Conformity shall be checked by measurement.
NOTE 1 ln cases of dispute regarding the green-and-yellow combination, and where appropriate to the method of colour marking of the insulation, a suitable testmethod for checking conformity is given in BS EN 50396,5.2.
NOTE 2 lt is understood that the colours green and yellow, when they are combined as specified, are recognized as identifying exclusively the core intendedfor use as an earth connection or similar protection.The colour blue is for theidentification of the core intended to be connected to neutral but, if there is noneutral, blue may be used to identify any core except for the earth or protectiveconductor.
NOTE 3 Depending on where the cables are used, restrictions may apply to the useof certain colours for some applications.BS 6004 pdf download.