Isolate (Electrically) : Positively disconnect a machine from its power supply to ensure that maintenance, tool setting or adjustments can be carried out without risk of accidental starting
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}