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The percentage of the minimum breaking load (MBL) of a new mooring rope or wire it carries, at which the winch brake is designed to render. Winch brakes are normally designed to hold 80% of the line MBL and are set in service to hold 60% of the mooring line MBL. Brake holding capacity may be expressed either in tones or as a percentage of the line MBL.
Note: The rated brake holding capacity is only achieved with one layer of wire on the tension drum. Operation with additional layers will decrease the brake holding capacity.