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why will my rcd not trip?

why will my rcd not trip when tested?
tony, April 2007
either a faulty RCD if so replace it or a faulty earth connectio even more dangerous get it checked by a proffesional

alkazar, July 2007
A safety device that doesn't do its task is by default unsafe.
Argos, 8 quid. A small price to pay for peace of mind.

Big Softy, April 2007