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TEHCNICAL INFORMATION
The cable is installed, a .D.C.. voltage test may be carried out. Each core should be tested at 4 kv against others and the armour, the latter connected to earth. The voltage should be increased gradually to full value and maintained continuously for 15 minutes. No breakdown of insulation should occur during test.
Colours
Red, Yellow or Blue Red and Black Red, Black and Grey & others.
Identification of Core
1 cores - Red, Black, Yellow or Blue
2 cores - Red and Black
3 cores - Red, Yellow and Blue
4 cores - Red, Yellow, Blue and Black
5 cores - Red, Yellow, Blue, Black and Grey
6 cores - Either Two adjacent cores (Counting and direction & above core) in each layer Blue and Yellow,                remaining a   cores Grey or all cores Grey with numbering i.e., and 1,2,3,….