On May 22, 11:00 am, wrote:
On 21 May 2007 19:51:29 -0700, sparky wrote:

I am amazed at how many truly ignorant people are advising that some
variety of interlock is OK for a transfer switch. It is not only
dangerous but
illegal in both Canada and the US.

There are certainly legal, listed breaker interlock systems that are
legal in the US. Look in a Square D or Siemens catalog.
I can't speak for canada but I bet these are CSA listed too.

The OP was talking about a keyed interlock with maybe ONE key or
maybe many more keys.

I should have explained more clearly.