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Ring Main at Consumer unit

Former Community Member
Former Community Member
My daughter has just had an electrical safety check done and I suspect that the electrician has been over zeleous..

Would anyone care to comment.


There is no grommet where the meter tails enter the consumer unit and the outer insulation stops just short of the knockout.

He has graded this C1.   Now my opinion is that that does not present an  an immediate threat to the safety of personell

It needs fixing but surely only a C2?


More intriguing.  He gives a C3 to the ring circuit because the two legs enter the consumer unit through separate knock outs.  I can't find that in the regs


And finally an old chestnut which has been discussed before.   A C3 because two radial "circuits" are served by a single breaker..  I have always argued that the definition of a circuit is that it is served by a single breaker.  Certainly if both radials were brought to a junction box outside the CU and then connected to the breaker by a single cable it would meet the definition of a radial..


Thanks for your attention

Parents
  • dcbwhaley:
     


    I do not know who the "you" refers to in this post, but if itis me you are are misrepresenting me.  I am completly in agreement with you.  In my opinion the lack of sheath is a C3.  There are two other places in the installation where,, at socket entries, where primary insulation is visible and these have been graded C3

    The fact that there is no grommet and the primary insulation is in contact with the edge of the knock-out is a seperate and more contentious issue.   I have done an experiment with a piece of tail cable and an old back box and found it almost impossible to damage the cable on the edge of a bare knock-out






    Worst case scenario:

    https://www.rqia.org.uk/RQIA/files/2e/2e609d70-0e41-4682-829b-83017c3bfcc8.pdf


Reply
  • dcbwhaley:
     


    I do not know who the "you" refers to in this post, but if itis me you are are misrepresenting me.  I am completly in agreement with you.  In my opinion the lack of sheath is a C3.  There are two other places in the installation where,, at socket entries, where primary insulation is visible and these have been graded C3

    The fact that there is no grommet and the primary insulation is in contact with the edge of the knock-out is a seperate and more contentious issue.   I have done an experiment with a piece of tail cable and an old back box and found it almost impossible to damage the cable on the edge of a bare knock-out






    Worst case scenario:

    https://www.rqia.org.uk/RQIA/files/2e/2e609d70-0e41-4682-829b-83017c3bfcc8.pdf


Children
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