Regulations on structure of bare electrical cables

The basic content provides for:

1. Parameters of nominal cross-sectional area, number and diameter of constituting fibers, number of twisted layers, breaking force, maximum conductor resistance at 20 degrees C.
2. Structural requirements:

• • Conductors must have a uniform surface, braids without overlapping, twisted or broken as well as other defects harmful to the process of use.
  • The successive layers must be in the opposite direction and the outermost spiral in the right direction. Twisted layers must be tight.
  • The steel wires of the steel core aluminum wire must be galvanized to prevent rust, the zinc coating will not peel or crack when tested on the core, and may or may not be greased with anti-rust grease.
  • There shall be no more than 5 splices on any one strand of the outermost layer of yarn over the fabricated length. The distance between the joints is not less than 15m, the joints must be welded by fire welding method.
  • No joints on single-strand steel cores are allowed.