Safety Interlock 2 : A switching lock that prevents access to an area or space during hazardous operation and prohibits hazardous operations while access is permitted. See: Interlock
Ralph W. Burklin & Robert G. Purington, Fire Terms: A Guide to Their Meaning and Use, National Protection Association, Boston, MA 1980 USA. (Guide: Meaning and Use, Nat Prot Association Fr Srvc - Amer) {457}