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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?
  • 0
    I am not a great fan of mixed systems - surely it will make the system confusing for the next unfortunate person wishing that they had a proper job
  • 0
    One arrangement of static caravans was served by a PME supply to intake and TT to vans. Each van pitch point was provided with a copper rod electrode which was subsequently dug up for the scrap value. However, the electrode provided at intake (PME terminal not used) was a chopped down structural steel column which was part of the building that had been demolished to make way for the caravan site. It provided the necessary connection to achieve compliance.
  • 0
    They aren’t daft at the scrap yards, they know that most Rods are copper plated steel.


     Andy Betteridge
  • 0
    Perhaps in such places the “safety electrical connection do not remove” label should be supplemented with a notice “earth rod has no intrinsic scrap value”. That would save them a great deal of wasted work in digging out the rods and let them concentrate on ripping out the earthing conductors!
  • 0
    I was in a scrapyard and a lad had brought in copper pipe to be weighed, the pipe was folded up, even the short lengths.


    The guy on the scales was laying into him asking if he thought he was stupid, as he knew the pipes had been filled with sand, then folded up to stop it falling out.


    Andy B
  • 0
    I think to work in the in the 'goods in' side of the scrap yard requires a certain sharpness of character - certainly the ones at my local are very quick on the uptake too.

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