... purpose) (1) Single Core. (2) Twin, Three, Four (Circular) Cores laid up filled, where ... A of IEC (General Purpose) Twin or Three Cores laid flat for Twin with E. ... Core - Red, Black, Yellow or Blue. (2) Two Core - Red & Black, (3) Three Core - Red, Yellow & Blue ... (4) Four Core - Red, Yellow, Blue & Black Colour of sheath - Black, White or ...