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Farm Outbuilding Office & TT Earthing etc.

The wild geese are migrating now. We can see them overhead flying south as they appear out of the morning mists, calling to each other as they fly in large numbers in a large V formation. Then they disappear back into the high level mists. Some say that they will fly to S. Africa.

Wild Geese Flying - Bing video

Meanwhile, a local smallholder who keeps four footed animals, has built a new wooden building to be used as an office and farm storage unit. The new proposed office is only about 25 metres square.

He asked me about installing a few sockets and lighting in the new building.

Presently the nearest supply is a plastic cased TT earthed consumer unit.

Near to the new build there are two earth electrodes used solely by the electric fencer unit. These are run in parallel. How far away from any TT L.V. installation earth electrode should they be?

Will the electric fencer interfere in any way with I.T. equipment?

Shall I supply the office with P.M.E. earthing, or shall I TT it?

I have my own thoughts on these matters, but wish not to have missed any safety issues.

There is a miniature Shetland pony that can't eat regular grass. It is allergic to it. Its hay has to be “sterilised” in a hay steamer rated at just under 3kW.

Thanks,

 

Z.

 

 

Parents
  • davezawadi (David Stone): 
     

    Farm = TT. Do not use the fencer electrodes, put in new one(s) at a distance. 

    BS EN 60335-2-76 (as referenced from BS 7671) says "A distance of at least 10 m shall be maintained between the energizer earth electrode and any other earthing system such as the power supply system protective earth or the telecommunication system earth."

    There are recommendations for physical separation of electric fence wiring from other wiring systems and overhead power lines too.

    Electric fence systems powered by separate energizers also need at least 2.5 m between electrodes of each system.

    Interesting aside … For those who have been reading about EV charging installations, and the distances discussed in the IET Code of Practice for EV Charging Equipment Installation for separating TT earth electrode systems from PME, the distances 2.5 m and 10 m will come as no surprise … they are based on physics plain and simple.

Reply
  • davezawadi (David Stone): 
     

    Farm = TT. Do not use the fencer electrodes, put in new one(s) at a distance. 

    BS EN 60335-2-76 (as referenced from BS 7671) says "A distance of at least 10 m shall be maintained between the energizer earth electrode and any other earthing system such as the power supply system protective earth or the telecommunication system earth."

    There are recommendations for physical separation of electric fence wiring from other wiring systems and overhead power lines too.

    Electric fence systems powered by separate energizers also need at least 2.5 m between electrodes of each system.

    Interesting aside … For those who have been reading about EV charging installations, and the distances discussed in the IET Code of Practice for EV Charging Equipment Installation for separating TT earth electrode systems from PME, the distances 2.5 m and 10 m will come as no surprise … they are based on physics plain and simple.

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