My service does not have a Main Breaker. I think the device looks very promising, and I think I will contact Duke about whether I can have one, after I study it a bit more. I appreciate the OP mentioning it to us.
/ Bargain transfer switch instead of double male ended cord farmer fix
Thank you for that lesson. I just learned something that may hel to keep me from killing myself...or someone else. None of the electricians I have ever been aroun have told me of this.