First published as part of AS 2818-1986.Revised and redesignated in part as AS 1926.3-1993.Second edition 2003.Third edition 2010.Reconfirmed 2016. Originated as part of AS 2818 1986. Previous edition AS 1926.3 2003. Third edition 2010. Reissued incorporating Amendment No. 1 (December 2011).