Any rope or steel cable will fail if it is worn out.
Always inspect your rope.
Never use the nominal,tensile or break strength listed for a rope or steel cable as the working load limit.*
There are many other safety factors to consider in the application and use of a steel cable or synthetic fibre rope; For more information, you can consult the Cordage Institute’s International Guideline on the Safer Use of Fibre Rope available here.
*A safe “Working Load Limit” or WLL is determined by dividing the nominal strength of a rope by an appropriate design factor. For example: A factor of 10 to 1 would mean a rope with a minimum break strength of 30,000lbs would have a WLL of 3,000lbs.