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Consumer Unit Change Video. Nice.

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I liked this video because it is well filmed, has no loud music, and the sparks is very pleasant and explains things well. With plastic conduit I cheat and use manufactured elbows and bends sometimes because they save time and are very consistent and neat. What do you think?




Z.
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    Putting the SPD at the far end of the bus bar on the second RCD means that the circuits on the first RCD have effectively over a meter approx of cable path (L+N) between them and the SPD.



    It's worse than that, putting it after a non-delayed 30mA RCD means that the RCD will likely nuiseance trip as soon as the SPD reacts to the first pulse - the 2nd pulse to come along then finds the SPD disconnected, but half the installation on the other RCD still connected - but now completely unprotected.


    If you do have to put and SPD downstream of an RCD it should be at least an S-type (as per note to reg 534.4.7).

     

    It should really be put before the RCDs, next to the main switch.



    I completely agree!


      - Andy.
Reply
  • 0

    Putting the SPD at the far end of the bus bar on the second RCD means that the circuits on the first RCD have effectively over a meter approx of cable path (L+N) between them and the SPD.



    It's worse than that, putting it after a non-delayed 30mA RCD means that the RCD will likely nuiseance trip as soon as the SPD reacts to the first pulse - the 2nd pulse to come along then finds the SPD disconnected, but half the installation on the other RCD still connected - but now completely unprotected.


    If you do have to put and SPD downstream of an RCD it should be at least an S-type (as per note to reg 534.4.7).

     

    It should really be put before the RCDs, next to the main switch.



    I completely agree!


      - Andy.
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