What is a Safe Working Load (SWL)?
Safe working loads for rope are usually described as a ratio of the MBS to load of a rope. Depending on industry the SWL varies. The NFPA recommends a 10 to 1 SWL for life safety rope. The National Association of Tower Erectors recommends a SWL of around 15 to 1. OSHA recommends a 10 to 1 ratio as well.