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I'm having a problem with the CU rcd tripping out, I have installed a feed outside to my daughters hot tub using 6mm cable about 14mts in length going to a metal clad dis board and from there via a 32A mcb to a 32A switched socket, insulation is good, no damp, but when I connected up the tub the rcd tripped, I removed the connections and connected a socket to connect a kettle as a test load everytime the kettle was turned on the rcd tripped, Ideas please tia