Quote:
Originally Posted by Jurassic Spark  You can export a PME supply to an outbuilding providing that the outbuilding in question has no structural steel metalwork. If it has, a TT supply feeding an RCD protected CU is required, all structural steel is to be bonded and an earth rod installed. The danger with PME is if the neutral conductor fails, extraneous metalwork is used as the return path for the supply. |
Technical at the IEE agree. I'm wiring an outbuilding in Cornwall at the moment and I tried to use an earth rod. It took 2 hours to install just a single 1m rod as I kept hitting granite. Once the rod was finally down, Ze came back at near 1000 Ohms so I really wanted an alternitve. I have an IEE wiring matters from 2005, it covers supplies to outbuildings and gives examples using both methods mentioned here, as the artical is pre-17th, I contacted the IEE just to be sure, they confirmed that it is still acceptable to export the PME, as long as the building has no extraneous conductive parts.
07-08-2008
Re: Exporting PME 
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