NBN EN ISO 8847:2004

ISO 8847:2004 specifies the minimum level of requirements for operation, construction and installation of cable and pulley steering systems on sailing craft of hull length up to 24 m , with or without an auxiliary engine.
ISO 8847:2004 sets requirements for the design and construction of all components of a steering system from the wheel to, and including, the steering arm. It applies only to cable and pulley steering systems, whether for pedestal or bulkhead types.
The design and specifications for the rudder shaft and rudder blade are within the province of the naval architect and are assumed to be appropriate to the size and speed of the boat.