Dandy,
Hello!
I was just trying to point out that from a safety standpoint of "less than qualified" persons working on the Electrical system the common tie handle is the safest. I areas where you would not want crital circuits being turned off or tripping off with others I believe single pole breakers are best. These areas should also have qualified personnel installing and servicing the system so it is not a problem. The only area I have seen this required is in residential work in some jurisdictions.
