1.Conductor Plain annealed copper or aluminum 2.Insulation General purpose PVC compound 3.Colour of cores Single core - red or black 2 cores - red and black 3 cores - red, yellow and blue 4 cores - red, yellow, blue and black 4. Formation 1) Single core 2) 2,3, or 4 cores - stranded together and the interstices may be filled with the sheathing compound or textile. A nonhygroscopic binder tape may be applied over the laid-up cores. 5.Bedding Black general purpose PVC compound 6.Armour Single core - Aluminum wire 2,3, or 4 cores - Galvanized steel wire 7.Sheath Black general purpose PVC compound