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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.

Parents
  • 0

    You need to be careful about these definitions of park homes etc.

    you are straying into the the realms of the Local Authorities Planning Departments rather than their Building Control Departments.

    Some years ago one of my customers had temporary Planning Permission for five years to site a mobile home on a farm for a groom to live in look after horses being imported from Mainland Europe.

    Around twenty years later it was still there and they replaced it with a timber cabin, someone reported this to the Planning Department at the Local Authority, there then followed a couple of years of formal discussions about wheels and what the legal definitions are of moveable and transportable are. One of the things discussed was that it actually uses the original electrical, water and sewage connections with the owner pointing out that although it looks different physically nothing much actually changed on site.

    The cabin is still there, the planners put some restrictions on it and both they and the owner spent a few thousand pounds on having the discussions about it, employing professionals to represent them.

    Regards the park home under discussion, if you own it converting the installation earthing to TT is not complicated or expensive, but I will suggest that you really need 10 metres separation between this homes electrical installation and the other installations.

    It will get more interesting if people are or will be charging electric vehicles on site.

Reply
  • 0

    You need to be careful about these definitions of park homes etc.

    you are straying into the the realms of the Local Authorities Planning Departments rather than their Building Control Departments.

    Some years ago one of my customers had temporary Planning Permission for five years to site a mobile home on a farm for a groom to live in look after horses being imported from Mainland Europe.

    Around twenty years later it was still there and they replaced it with a timber cabin, someone reported this to the Planning Department at the Local Authority, there then followed a couple of years of formal discussions about wheels and what the legal definitions are of moveable and transportable are. One of the things discussed was that it actually uses the original electrical, water and sewage connections with the owner pointing out that although it looks different physically nothing much actually changed on site.

    The cabin is still there, the planners put some restrictions on it and both they and the owner spent a few thousand pounds on having the discussions about it, employing professionals to represent them.

    Regards the park home under discussion, if you own it converting the installation earthing to TT is not complicated or expensive, but I will suggest that you really need 10 metres separation between this homes electrical installation and the other installations.

    It will get more interesting if people are or will be charging electric vehicles on site.

Children
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