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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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    So the law permits it. It permits many things. But to decide it is safe or not, I'd still look at the construction on a case by case basis.

    Caveat, I'm one of those who sometimes TTs supplies to things like  shipping containers, trailers and other things with a lot of external earthed metal if the supply was PME and they are not on free draining gravel. Equally I might not blink at an  export PME to a wooden shepherds hut even though it can be towed... I've never actually been asked that latter one, but thinking about it....

    Mike.

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  • 0

    So the law permits it. It permits many things. But to decide it is safe or not, I'd still look at the construction on a case by case basis.

    Caveat, I'm one of those who sometimes TTs supplies to things like  shipping containers, trailers and other things with a lot of external earthed metal if the supply was PME and they are not on free draining gravel. Equally I might not blink at an  export PME to a wooden shepherds hut even though it can be towed... I've never actually been asked that latter one, but thinking about it....

    Mike.

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