Interesting on the immersion detection. Does it have a breaker fitted at the plug or in the cord, or does it just short the line and rely on the house breaker to open the circuit?
I don't remember hearing about the American IEEE's conclusion on EM fields, although I recall several groups here recommending that there is no need for further action as "no direct link has been proven," or words to that effect.
(Probably worded to avoid being torn apart by lawyers if any link should be found in the future; you can't publicly announce that grass is green these days without a disclaimer!)
Some domestic lighting circuits here were wired with single cables taking different routes, so stronger fields are likely there. As someone who works with sensitive audio and RF equipment, I'd certainly agree that anything which helps keep EM interference to a minimum is welcome.
By the way, this is another reason I don't like rings. The ground wire is run as a ring as well, which can give rise to some awkward loop problems.
