In message , Ellis Greensitt
writes
The RCD only protects against a fault to earth
What you had was a short circuit in a faulty lamp, this would not produce a
fault to earth and therefore not operate the RCD. This fault would product a
current sufficient to operate the fuse in the CU.
Hope this helps


Look ellis this is how it works

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Hope this helps and hope you're able to take this simple concept onboard



--
geoff