Isolating Switch : A switch intended for isolating an electric circuit from the source of power. It has no interrupting rating, and it is intended to be operated only after the circuit has been opened by some other means
Department of Energy AREA SAFT, DOE Handbook, Electrical Safety (Appendix B), Acronyms and Definitions, DOE-HDBK-1092-98, D.C. 20585, USA 1998. http://energy.gov/sites/prod/files/2013/07/f2/hdbk 1092.pdf, (Electr Sfty - Amer) {43}