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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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    wallywombat:

    Surely the correct reply is "follow the manufacturer's instructions" ??? (I'll just get me coat).




    Sometimes the manufacturer's instructions are simply wrong or even incomplete. I attended a house yesterday to wire up a new 6.0kW double oven and separate hob. The manufacturer's instructions had a diagram showing that the new 6.0kW double oven could be plugged into a socket at the rear of the appliance. After a bit of head scratching we concluded that the blanket instructions covered lesser rated ovens that could be plugged into a 13 Amp socket, but had been wrongly placed with the higher rated 6.0kW double ovens as well. I ignored the instructions.


    Z.

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  • 0

    wallywombat:

    Surely the correct reply is "follow the manufacturer's instructions" ??? (I'll just get me coat).




    Sometimes the manufacturer's instructions are simply wrong or even incomplete. I attended a house yesterday to wire up a new 6.0kW double oven and separate hob. The manufacturer's instructions had a diagram showing that the new 6.0kW double oven could be plugged into a socket at the rear of the appliance. After a bit of head scratching we concluded that the blanket instructions covered lesser rated ovens that could be plugged into a 13 Amp socket, but had been wrongly placed with the higher rated 6.0kW double ovens as well. I ignored the instructions.


    Z.

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