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PV submain cables: 712.521.101

Jam

Hi all,

To paraphrase the regulation (not a verbatim quote, my emphasis), "Cables on the DC side shall be selected so as to minise risk of faults. This shall be achieved by (i) single-core cables having a non-metallic sheath or (ii) singles in individual conduits. Other types of wiring system providing an equivalent level of safety are not precluded"

So... this appears to be a conflict between a "shall be XX" and "other options are available".

  1. Should this really be read as "This could be achieved by"?
  2. Does a cable construction such as single core two layers of insuation* under a wire/tape armour with non-metallic sheath give you an option for burial of larger DC main/submains? I feel like it strictly does, but isn't what the authors had in mind when drafting the description... but I also think it gives the same degree of safety (or potentially improved)

*No, I don't mean bedding

I note that this is a watered down version of the DFPC that didn't have the opt-out clause.

Thanks in advance for your thoughts.

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    522.8.10 (cables buried in the ground to have an earthed armour/sheath) never did sit very well with unearthed or non-ADS circuits (I've felt for a while that this regulation might be better re-written for each individual chapter 41 section). Rather going down the concentric earth route, the other option of a 'conduit or duct giving equivalent protection against mechanical damage' might be more appropriate. Presumably if you're burying d.c. cables it's in a somewhat controlled environment, so it should be possible to put suitable procedures in place - e.g. prohibiting mechanical excavators in the vicinity.

       - Andy.

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  • 0

    522.8.10 (cables buried in the ground to have an earthed armour/sheath) never did sit very well with unearthed or non-ADS circuits (I've felt for a while that this regulation might be better re-written for each individual chapter 41 section). Rather going down the concentric earth route, the other option of a 'conduit or duct giving equivalent protection against mechanical damage' might be more appropriate. Presumably if you're burying d.c. cables it's in a somewhat controlled environment, so it should be possible to put suitable procedures in place - e.g. prohibiting mechanical excavators in the vicinity.

       - Andy.

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