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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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    John Peckham:

    If everyone around you has a FE then you will be OK as you will have "heard immunity". Note this is the first time anyone has used this term in the electrical field. I claim copyright on this along with my first use of the terms "doorstep competency" and "unicorn device".  




    It has already been used in the public domain, although with the different spelling of herd, which is perhaps more relevant in the electric field. ?

    Clive

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  • 0

    John Peckham:

    If everyone around you has a FE then you will be OK as you will have "heard immunity". Note this is the first time anyone has used this term in the electrical field. I claim copyright on this along with my first use of the terms "doorstep competency" and "unicorn device".  




    It has already been used in the public domain, although with the different spelling of herd, which is perhaps more relevant in the electric field. ?

    Clive

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