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BS7671:2018 SECTION 708

Phil Kinnaird

Hi all,

At present i stay in a Residential Park home. 

I have raised the matter with with the Site Manager that in my opinion the Connection to the Lodges is not in compliance with BS7671:2018 Section 708. The Electrical supply has been confirmed by the DNO  by visual inspection to be PME.

Section 708 clearly states that a Residential Park Lodge under ESQCR Regulations states that a PME earthing facility shall not be used for the means of earthing for this type of installation.

Unfortunately the Site Manager is digging his heels in stating he has spoken with 2 Electrical Contractors who say it is perfectly OK to utilise this means of earthing and the a Contractor who carried out an EICR Report stated in his opinion the System was not PME despite the DNO confirming it was in an email.

I have advised in my opinion each lodge should have its own earth rod installed to earth the individual lodges.

I did contact the helpline at Certsure which is a helpline run by the NICEIC.

They did advise that in their opinion BS7671 :2018 would apply.

They also provided an extract from UK Power Networks Engineering Design Standard  EDS 06-0017 CUSTOMER LV INSTALLATION EARTHING DESIGN Section 6.9 Mobile Homes which states.

 6.9 Mobile Homes

A PME earthing terminal may be provided to mobile homes if the following criteria are satisfied.

The mobile home is permanently sited

The mobile home is is permanently connected to water and sewerage services

The installation is constructed such that a person in contact with the general mass of earth cannot touch any metalwork connected to the earth terminal

The installation complies with the earthing and bonding requirements of BS7671

If these conditions cannot be satisfied the mobile home shall be treated as a caravan in according with Section 5.6

Refer to BS7671:2018   SECTION 721 for earthen and bonding.

Any comments / clarification would be gratefully received.

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    It looks like a relatively new site. If the DNO distribution system is new, with modern joint kits, it is almost impossible to lose the neutral. In any event, if there was to be an injury, then someone should sue the ass off the DNO! 
    An approach to HSE in this part of the world confirmed that not one single incident has been investigated in the last 20 years (as long as the officer responding to my query was in post). That is not to say that loss of neutral did not occur, merely that injury was not sustained or, perhaps, not reported.

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  • 0

    It looks like a relatively new site. If the DNO distribution system is new, with modern joint kits, it is almost impossible to lose the neutral. In any event, if there was to be an injury, then someone should sue the ass off the DNO! 
    An approach to HSE in this part of the world confirmed that not one single incident has been investigated in the last 20 years (as long as the officer responding to my query was in post). That is not to say that loss of neutral did not occur, merely that injury was not sustained or, perhaps, not reported.

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