On 14/06/15 17:07, ARW wrote:
"Tim Watts" wrote in message
...

The must be on the same circuit and generally are put on a lighting
circuit (ground floor preferred) so that circuit trip is immediately
apparent (evening/night at least).


If you do that then there should be a means of isolating the smokes
whilst still leaving the lights powered up.


Is there a recommended way? I presume it should not be *too* easy?
Emergency key type test switch or just an out of the way normal isolator?