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The higher the voltage you test at the more likely it is that small imperfections would show up as a lower IR reading and give you an indication of an incipient fault earlier than a lower test voltage.
If blue insulation is over heated then it can cause changes in the colours used to impregnate the insulation as chemical reactions including oxidation will occur much more rapidly, reduction in the number of double and triple bonds in a coloured organic material can stop the material being coloured. If the blue is made up of a mixture that includes green to get the shading right and the blue colour is decolourised then green will remain.
Thanks. Yeah that seems logical to me, but I can only see use for it in special circumstances. As I see it the lower the test voltage you can use to confidently prove a cable the better. As we all know the higher the voltage used the more dangerous it can be if something should go wrong.
However this green discolouration seems to allude me.