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P.M.E. and Potato Peelers.

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About 2 years ago I was asked to undertake electrical work at a local chip shop/fast food outlet. I was concerned about large metal drummed wet potato peeling machines located on a wet floor in an old outbuilding and the P.M.E. earthing system. I could not devise a safe system in my mind where the large potato peeling machines positioned on a wet stone floor could be made safe with the P.M.E. earthing.


Anyway, unfortunately recently the place burned down and is now boarded up. The cause may not be electrical, but due to oil catching fire.


I have not done any work in the building at all.


Because the machines could not be effectively TT earthed I did not proceed with any work.

https://www.edp24.co.uk/news/norfolk-norfolk-fire-at-mundesley-business-7985784


Z.
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    Answering the OP, you can do a good job of equipotential bonding of a wet concrete slab, you just need to fix a large area of metal to the slab, or access the reinforcing or whatever, and connect this to the bonding system. This will give similar effect to the "foundation Earthing" being pushed at one point by the IEC. It will be sufficient to prevent much danger of death, although shocks will still be possible. You also need to remember that operatives in food processing areas tend to wear rubber boots (often white) and these probably provide a good degree of insulation. It is nothing like as dangerous as you seem to think, otherwise the entire food industry would have deaths all the time.
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    Answering the OP, you can do a good job of equipotential bonding of a wet concrete slab, you just need to fix a large area of metal to the slab, or access the reinforcing or whatever, and connect this to the bonding system. This will give similar effect to the "foundation Earthing" being pushed at one point by the IEC. It will be sufficient to prevent much danger of death, although shocks will still be possible. You also need to remember that operatives in food processing areas tend to wear rubber boots (often white) and these probably provide a good degree of insulation. It is nothing like as dangerous as you seem to think, otherwise the entire food industry would have deaths all the time.
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