Fail-Safe 11 : The mode of failure whereby a safe condition is maintained upon loss of power or actuating force to any control element, or failure of any control element to operate when energised
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}