... IEC (General purpose) (1) Single Core. (2) Twin, Three, Four (Circular) Cores laid up filled, where ... : 5831 (General purpose). For Flat Twin with or without E.C.C., Flat Three Core, PVC sheath General ... A of IEC (General Purpose) Twin or Three Cores laid flat for Twin with E.C.C. the position ... Core Nominal Thickness of Sheath Nominal Cross Sectional Twin CoreThree CoreFour CoreArea of ECC (mm.)(mm.)( ...