This International Standard specifies the requirements for performance, sizing, marking and test methods for deck safety harnesses and safety lines. It is applicable to harnesses and lines in the following sizes of body mass a) size 1 50 kg1) b) size 2 20 kg . 50 kg1) c) size 3 . 20 kg1) which are intended to be worn by all persons when in the exposed cockpit or on the working deck of a vessel afloat. It is not applicable to dinghy "trapeze" harnesses, windsurfing harnesses, seat harnesses for fast motor boats and harnesses intended to protect against fall from a height.