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http://www.russandrews.com/product....&customer_id=PAA1690089414233YHDJVLIQGOYZSSDCAbout the wiring regulations
The latest (17th) edition of the IEE‘s Wiring Regulations state that you should now no longer add an additional earth rod to your domestic ring main earth. This is something which was previously allowed and many people have had an additional earth rod installed to improve their system‘s sound quality.
We’ve developed our RF Router to allow you to continue to use an additional external earth rod and comply with the latest regulations. When installed, it means that your additional earth rod is not directly connected to the mains earth, while ensuring that noise and RF is dumped out of your system.
The internal components being resistors I guess and some kind of filter.
Worth £240?