This standard specifies the technical requirements for paper-insulated multi-strand stranded conductors. It is suitable for the leads of transformers or high voltage electrical equipment. The core consists of electrician soft copper stranded wires conforming to GB/T 12970 standard, and the insulating layer is wrapped by 3 or more layers of insulating paper tape. The standard also specifies the nominal cross-sectional range and specific conditions of use for this type of conductors. This standard should be used in conjunction with GB/T 7673.1 to ensure the mass and safety of the product.