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Best practices

Hi all can someone please give me some advice on the following? 

 

  1. say you’re maintaining a circuit and you realise parts of the circuits do not comply to the regulations what is the standard procedure for example ZS values that do not comply or IR that’s too low. I know in the industrial setting we are pressured to keep things going (critical kit) but say even if we’ve got it in writing we’ve said it’s potentially dangerous and we’ve been told in writing to switch it back on who is then at fault?

 

  1. say the circuit is an old installation and complied at the time of installation if we were then doing work on that circuit say for instance changing adding a spur to sockets that aren’t RCD protected what is the protocol with regards to bringing it up to current standard? 

 

Parents
  • A lot depends on the DEGREE of non compliance. Taking as an example Ze, a figure SLIGHTLY higher that that required might be reluctantly acceptable, it probably does not matter much in practice if an earth fault on a submain is disconnected in 5.5 seconds instead of in 5 seconds.

    If however the figure was several times that permitted, then I would be very reluctant to allow continued use.

    Likewise with other defects. 15 amp socket outlet on a 20 amp circuit ? not really correct but not that bad. 15 amp socket outlet on a 63 amp circuit, no way !

Reply
  • A lot depends on the DEGREE of non compliance. Taking as an example Ze, a figure SLIGHTLY higher that that required might be reluctantly acceptable, it probably does not matter much in practice if an earth fault on a submain is disconnected in 5.5 seconds instead of in 5 seconds.

    If however the figure was several times that permitted, then I would be very reluctant to allow continued use.

    Likewise with other defects. 15 amp socket outlet on a 20 amp circuit ? not really correct but not that bad. 15 amp socket outlet on a 63 amp circuit, no way !

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