... IEC (General purpose) (1) Single Core. (2) Twin, Three, Four (Circular) Cores laid up filled, where necessary, with suitable material PVC ... Insulation: Type A of IEC (General Purpose) Twin or Three Cores laid flat for Twin with E.C.C. the position ... , Yellow or Blue. (2) Two Core - Red & Black, (3) Three Core - Red, Yellow & Blue(4) Four Core - Red, Yellow, Blue ... 7..501.41.21.61.71.8.. PVC Electric Wire