IEC gives the requirements for two types of heat-shrinkable, polyolefin sleeving for bus-bar insulation, with a nominal shrink ratio of 2, Type A: Medium wall - internal diameter up to ,0 mm typically Type B: Thick wall - internal diameter up to ,0 mm typically These sleevings are normally supplied in colour, red or brown. Since these types of sleeving cover a significantly large range of sizes and wall thicknesses, Annex A Tables A. The actual size and wall thickness will be agreed between the user and supplier depending on the electric strength of the installed tubing offered and the requirements of the user.
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IEC System of Conformity Assessment Schemes
IEC Title Flexible insulating sleeving - Part 3: Specifications for individual types of sleeving - Sheet Heat-shrinkable polyolefin sleeving, general purpose, flame retarded, shrink ratio Abstract Gives the requirements for one type of general purpose, flexible, flame retarded, heat-shrinkable polyolefin sleeving with a nominal minimum shrink ratio of Sizes, shrink ratios or colours other than those specifically listed in this standard may be available as custom items. These items are considered to comply with this standard if they comply with the property requirements listed in Tables 2 and 3, excluding dimensions. Materials which conform to this specification meet established levels of performance.