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PME earthing to a group of static caravans TT earth required?

LittlePlumb
Can anyone give me there valuable opinions on earthing to a static-mobile home please. As per BS7671, PME earthing is not allowed to (mobile) caravans. However, does a static caravan (plumbed in and permanent with a SWA cable supplying it and no plug/socket arrangement) count as a caravan. The Static caravan is metal framed, and placed some distance from the PME source 40m or so, and the cable size is 16mm CSA 3 core, so PME (100A single phase) could be exported on the cable as its greater than 10mm CSA,

The static caravan is permanent and not quite the same as a transportable caravan, so does a TT earth need to be installed?
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    AJJewsbury:




    In terms of the regs, maybe not, as static caravans are not explicitly mentioned.



    There have been some changes in the 18th and "residential park homes" do now get a mention in section 708. The BS 7671 prohibition on PME now seems to extends to all socket outlets on the park's installation -  whether they're supplying a caravan (tourer) or a residential park home (static). That wouldn't apply in the OP's case where the static is hard-wired though.


    Interestingly the requirement for 30mA RCD protection also extends now to fixed connections to residential park homes - so things are definitely tending away from treating statics 'just like any other building'.


      - Andy.


    Thanks Andy. More problems using a 30 mA RCD tho, since the distribution cupboard/meter is in a locked cabinet, so an additional sub main/cabinet really needs to be put in to allow access to the residents when the RCD trips. Existing site is an absolute mare. No glands on SWA, multiple cables stuffed through ungrommeted holes, un buried cables, no fixings, no cover on DB since one of the SWA cables is wired straight into the DB since there's no un grommeted holes left to stuff cables thru...


     

     




     

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  • 0

    AJJewsbury:




    In terms of the regs, maybe not, as static caravans are not explicitly mentioned.



    There have been some changes in the 18th and "residential park homes" do now get a mention in section 708. The BS 7671 prohibition on PME now seems to extends to all socket outlets on the park's installation -  whether they're supplying a caravan (tourer) or a residential park home (static). That wouldn't apply in the OP's case where the static is hard-wired though.


    Interestingly the requirement for 30mA RCD protection also extends now to fixed connections to residential park homes - so things are definitely tending away from treating statics 'just like any other building'.


      - Andy.


    Thanks Andy. More problems using a 30 mA RCD tho, since the distribution cupboard/meter is in a locked cabinet, so an additional sub main/cabinet really needs to be put in to allow access to the residents when the RCD trips. Existing site is an absolute mare. No glands on SWA, multiple cables stuffed through ungrommeted holes, un buried cables, no fixings, no cover on DB since one of the SWA cables is wired straight into the DB since there's no un grommeted holes left to stuff cables thru...


     

     




     

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