Annex II of NR-18 – Steel Wire and Synthetic Fibre Ropes

  1. It is mandatory to comply with the conditions of use, sizing, and maintenance of steel wire ropes used in construction works, as stipulated by the current national technical standards.
  2. Traction steel wire ropes must not have splices or broken strands that could compromise their safety.
  3. Steel wire ropes must have a breaking load of at least five times the maximum working load they are subjected to and a tensile strength of at least 160 kgf/mm² (one hundred sixty kilograms-force per square millimeter).
  4. Steel wire ropes must meet the minimum requirements contained in current national technical standards and allow for their traceability.
  5. Steel wire and synthetic fibre ropes must be secured using devices that prevent slipping and wear.
  6. Synthetic fibre or steel wire ropes used in Personal Fall Protection Systems (PFPS) and those used for supporting suspended chairs must be exclusive to each type of application.
  7. Steel wire and synthetic fibre ropes must be replaced when conditions compromising their integrity due to use are observed.
  8. Synthetic fibre ropes used in PFPS as vertical lifelines must be compatible with the fall arrester to be used.
  9. Synthetic fibre ropes must undergo testing conducted by the manufacturer, in accordance with current national technical standards.
  10. The manufacturer’s manual must include recommendations for inspection, use, elongation, maintenance, and storage of synthetic fibre ropes.
  11. Synthetic fibre ropes must have a minimum breaking load of 22 kN (twenty-two kilonewtons) without terminals and can be made of three covers or cover and core, with the use of polypropylene being prohibited for their manufacture.