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Farm Outbuilding Office & TT Earthing etc.

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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.

 

 

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    davezawadi (David Stone): 
     

    Farm = TT. Do not use the fencer electrodes, put in new one(s) at a distance. A pony allergic to grass is a serious problem, let it eat cake! (Horse nuts). The fence should not cause an interference problem, provided you don't introduce one with the Earthing. How will the phone line and Internet get to the building?

    But does a farm office have to be TT earthed as well? Is there a remote risk of extension leads being used outside of it? I have no intention of using the fencer electrodes as earthing for the office.

    Z.

    Section 705 does NOT prohibit PME or TN-S? Agricultural premises are not (always) caravan sites.

    If you are talking about 705.415.2.1, that only has a note recommending PME is not used unless a supplementary -bonded metal grid is laid in the floor of locations intended for livestock … but the normative text before this note recommends concrete reinforcement is part of the bonding in any case.

    I agree, however, that in areas for livestock, TT (separated from PME) is preferable, and you might as well because RCDs are necessary anyway even in distribution circuits - 705.411.1.

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  • 0

    Zoomup: 
     

    davezawadi (David Stone): 
     

    Farm = TT. Do not use the fencer electrodes, put in new one(s) at a distance. A pony allergic to grass is a serious problem, let it eat cake! (Horse nuts). The fence should not cause an interference problem, provided you don't introduce one with the Earthing. How will the phone line and Internet get to the building?

    But does a farm office have to be TT earthed as well? Is there a remote risk of extension leads being used outside of it? I have no intention of using the fencer electrodes as earthing for the office.

    Z.

    Section 705 does NOT prohibit PME or TN-S? Agricultural premises are not (always) caravan sites.

    If you are talking about 705.415.2.1, that only has a note recommending PME is not used unless a supplementary -bonded metal grid is laid in the floor of locations intended for livestock … but the normative text before this note recommends concrete reinforcement is part of the bonding in any case.

    I agree, however, that in areas for livestock, TT (separated from PME) is preferable, and you might as well because RCDs are necessary anyway even in distribution circuits - 705.411.1.

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