All cables shall have extruded bedding and non-hygroscopic solid fillers and shall be laid-up using fillers as necessary, so that the inner sheath is substantially round and completely filled and to satisfy cable gland tolerance requirements. Filler shall be non-hygroscopic as per IEC 60092-376.The cable inner and outer sheath shall be extruded over the insulation and armour. They shall be resistant to scuffing, rough handling, UV radiation, heat, crude oil, diesel, and natural gas corrosive agents normally found in crude oil processing facility. The cable outer sheath shall be coloured according to the cable type and embossed with the cable identification at one (1) meter intervals.For non-critical equipment or circuits, cables shall as a minimum be flame retardant complying with IEC 60332 Part 2 Cat A for instrumentation and communication cables with the oxygen index of not less than 30 and acidic emission less than 0.5% in accordance with IEC 60754.