Recent content by sxdave

  1. S

    Emergency lights fed by two supplies

    Hello DPG, thanks for replying. The earths are commons you would expect. I am not sure about the neutrals. I am not at the site right now but I have a photo of the terminal block in one of the fittings. In this photo the neutrals are not obviously connected although they might be connected...
  2. IMG_2326.jpg

    IMG_2326.jpg

    • sxdave
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    • Category: Electrical Videos
  3. S

    Emergency lights fed by two supplies

    I have come across a similar situation to this and am looking for a suitable solution. The problem is with 2D fluorescent light fittings that are now failing due to age. Some of these 2D fittings are also emergency lights. They have two complete feeds (L, N & cpc for normal lighting and another...
  4. S

    EICR Test Fail, before and after

    Sorry - did not see the latest posts today - much of below has already been commented on... Perhaps I am missing something but I am puzzled as to why the MCB on circuit 4 has changed. Looking at the 'before' photograph both MCB3 (32A) and MCB4 (32A) have two red line wires, suggesting (but not...
  5. S

    Legrand Tenby compatibility

    Unless legrand have done type approval of their MCBs/RCBOs in Tenby CU then I suggest it would have to be a consumer unit replacement. Otherwise I think, in legal terms, you would be making yourself responsible for a CU setup that was not type approved. Open to correction on this if have...
  6. S

    Electrically operated cooking gas valve?

    I have only a suggestion for the motor to use - hope that helps and that the following is not telling you what you already know. I think small stepper motors may be what you want. Some come with several gears so the rotor rotates many times for a small movement of the output shaft. The rotor is...
  7. S

    Classification of RCD - for Additional protection only or Fault protection?

    The problem is with my understanding of how they decide the RCD is not for ADS. As the RCD is present and functional I consider the circuit to be safe as required by regulations. So, as you surmise, my concern is with the report. I am very much in favour of your view expressed in one of your...
  8. S

    Classification of RCD - for Additional protection only or Fault protection?

    Thanks for replying. Your 4th paragraph ('If the reason is unknown....") is of most interest to me regarding this situation. Are you basing this on common sense or is it upon some published material I have missed such as guidance note? I have not tried to estimate the length of the RFC. I will...
  9. S

    Classification of RCD - for Additional protection only or Fault protection?

    I agree, a 'B' curve MCB would eliminate the uncertainty I am seeing. I am trying to clarify how the decision is made in classification of the RCD purpose in a case such as this. The installation is about 25 years old to the best of my knowledge. Nearly all MCBs are 'C' curve ( 29 out of 34) but...
  10. S

    Classification of RCD - for Additional protection only or Fault protection?

    Sorry, missed one point in your reply. There is one other circuit where the values of Zs(db) and R1+R2 lead me to question the true purpose of the RCD. I do not think there is a loose connection given the values recorded.
  11. S

    Classification of RCD - for Additional protection only or Fault protection?

    Thanks for replying. Here are some of the relevant measurements... Ze = 0.15 ohms R1+R2 of cable from intake to DB is 0.04 ohms (DB is about 5-6 metres horizontally distant from the intake). R1+R2 of ring final circuit is 0.45 ohms. MCB is 32 amp, 'C' curve. Max Zs measured at sockets on ring is...
  12. S

    Classification of RCD - for Additional protection only or Fault protection?

    Ze measured at the intake as 0.15 ohms, R1+R2 of cable from intake to db measured as 0.04 ohms, Zs(db) is recorded on EICR as 0.19 ohms. Final ring circuit R1+R2 measured value is 0.45 ohms. MCB is 32 amp 'C' curve. So I can do the calculation Zs = Ze + (R1+R2 [intake to DB]) + (R1+R2 [ring...
  13. S

    Classification of RCD - for Additional protection only or Fault protection?

    Thanks for taking look at this. Yes, the DB is quite a distance from the main intake, about 5-6 metres horizontally. So given ceiling height the run of cable is probably more like 8-10 metres
  14. S

    Classification of RCD - for Additional protection only or Fault protection?

    I would appreciate some opinions on the following situation... I have been asked to comment on an EICR for a local community resource (church hall used by various groups of all ages). During an EICR on the TN-C-S installation the testing of a ring final circuit gave R1+R2 and Zs(db) values that...
  15. S

    continuity test on a protective bonding conductor

    I have suggestions for you to consider. Obviously I do not know what your teacher wants as an answer but perhaps you should be informing the duty holder (person responsible for the safety of the installation on a day to day basis) of the finding and consequences for the installation (safe or...
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