Insulation resistance: when the ambient air temperature is 15 35 ℃, relative humidity of not more than 80%, compensation conductor should be finished product line between the core and the line between core and screen out layer of insulation. Insulation material layer and sheath mechanical properties: insulation material layer and a sheath the tensile strength of 12 or more. 5 n/m ㎡, elongation is 125% or higher. Flame retardant properties: according to user needs can meet GB12666 - Wire 1990 a, B, C compensation and compensation cable shape size and weight calculation note: Ⅰ with screen off or aluminum-plastic composite belt of the cable diameter slightly not less than no screen layer of cable Ⅱ split screen off and total screen off the cable diameter of not less than only slightly split screen out cable Ⅲ only total screen out of the cable diameter is slightly less than only split screen off the cable.