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The Sunday Salient..........Quiz.

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Biblical references will instantly disqualify any entrant, so there, be warned, we don't want that nonsense on a Sunday do we?


The I.E.T. opening web site page with the rotating rectangular board has made me dizzy. Is the designer on something do you think? Clicking on it is like duck shooting at a fun fair side stall with a light cork gun and a wind blowing.


Anyway to the Sunday consideration. Where was I? Oh yes R.C.B.O.s, those residual current devices with inbuilt overload protection and a little functional tail coloured cream or green and yellow.


Q.1. Is there any safety advantage in having a separate connection to earth by an independent earth electrode to the main earth terminal for the functional earth tail of an R.C.B.O. for:


a, A TT supplied installation?


b, A TN-S supplied installation?


c, A TN-C-S supplied installation?


Z.




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    Hmm, an intersting thought I`d never considered. It does give you a double edge that if your earth reference is lost say with a PEN break or MET loss then you still have an earth to oppose the L and hopefully give a trip.


    Ditto on the Bible refs too. It`s the kind of thing that spoils xmas - bringing religion into it
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  • 0
    Hmm, an intersting thought I`d never considered. It does give you a double edge that if your earth reference is lost say with a PEN break or MET loss then you still have an earth to oppose the L and hopefully give a trip.


    Ditto on the Bible refs too. It`s the kind of thing that spoils xmas - bringing religion into it
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