IEC 60684-3-283:2010 gives the requirements for two types of heat-shrinkable, polyolefin sleeving for bus-bar insulation, with a nominal shrink ratio of 2,5:1. This sleeving has been found suitable up to temperatures of 100 °C. - Type A: Medium wall Internal diameter up to 170,0 mm typically - Type B: Thick wall Internal diameter up to 165,0 mm typically.