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Direct Buried cables within a controlled area and what constitutes mechanical protection

Former Community Member
Former Community Member
Hello 


I have a  query raised by a client stating that a PV solar Generation site built on agricultural land is non compliant due to direct buried cables. 

Some of the DC string cable is direct buried roughly at 600 depth laid within  cable sand and protection tape over. 

The cable spec is EU and states is suitable for direct burial. 

The protection system constantly monitors the  insulation resistance and dis engages the inverter upon fault. 

The client has stated a non compliance due that no mechanical protection has been installed underground but all cables above ground are mechanically protected. 

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  • 0
    The idea that BS7671 covers generating stations is not correct. Even the ESQCR is rather vague on this. I suggest again, the "consultant" is wrong. Suggest this to him and ask for evidence, that usually works for me! BS7671 does not cover generation, the Grid, or anything else except after the meter. Where are the metallic sheaths on EHV overheads? You say not buried, I suggest you look at the superconducting connections.

    Added as edit. The scope of these things is set out, it is much more important than the content!


    David CEng etc.
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  • 0
    The idea that BS7671 covers generating stations is not correct. Even the ESQCR is rather vague on this. I suggest again, the "consultant" is wrong. Suggest this to him and ask for evidence, that usually works for me! BS7671 does not cover generation, the Grid, or anything else except after the meter. Where are the metallic sheaths on EHV overheads? You say not buried, I suggest you look at the superconducting connections.

    Added as edit. The scope of these things is set out, it is much more important than the content!


    David CEng etc.
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