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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
    Do you mean  section 13 ?


    It needs reading with the section before. Note the bold which exempts generating stations or substations..


    12.  No generator or distributor shall use any of his underground cables and associated equipment (except those in generating stations or substations) which he knows do not comply with regulations 13 and 14.

    Protective screens


    13.—(1) Underground cables and associated equipment which contain conductors not connected with earth shall be protected in accordance with paragraph (2).


    (2) The protection referred to in paragraph (1) shall comprise—


    (a)in respect of joints or terminations of a conductor in a low voltage system, some form of mechanical protection; and


    (b)in respect of any other part of any conductor, an electrically continuous metallic screen connected with earth,


    so placed as to ensure that, so far as is reasonably practicable, any tool or device likely to be used in the vicinity will make contact with that protection or screen before it can make contact with any conductors not connected with earth.
Reply
  • 0
    Do you mean  section 13 ?


    It needs reading with the section before. Note the bold which exempts generating stations or substations..


    12.  No generator or distributor shall use any of his underground cables and associated equipment (except those in generating stations or substations) which he knows do not comply with regulations 13 and 14.

    Protective screens


    13.—(1) Underground cables and associated equipment which contain conductors not connected with earth shall be protected in accordance with paragraph (2).


    (2) The protection referred to in paragraph (1) shall comprise—


    (a)in respect of joints or terminations of a conductor in a low voltage system, some form of mechanical protection; and


    (b)in respect of any other part of any conductor, an electrically continuous metallic screen connected with earth,


    so placed as to ensure that, so far as is reasonably practicable, any tool or device likely to be used in the vicinity will make contact with that protection or screen before it can make contact with any conductors not connected with earth.
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