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Supply type?

D4G

Hi people, 

I need to know the supply type, see picture. 

Its thrown me as there  are 2 cables but not of same size so I assume not a looped service. Not the best picture but the cable on the left appears to be your average TNCS type cable but the cable on the right is about half the diameter, would this be a seperate earth cable?

 

f91b276108ba5f0ea53b7e96f23c1a7b-huge-cutout.jpg
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    I need to know the supply type, see picture. 

    The DNO seem to have provided an Earth terminal - so provided that's working, it's TN. Just about every UK DNO says to treat their earth terminals as PME unless there's some explicit agreement that it isn't (which is unlikely unless this is a caravan site or marina) - as if it's not PME now it's likely to be in the future. They don't even have to change anything at the head to make it PME - just re-do some joints under the road or on poles.

    Really we could do with a box on the forms that says ‘Appears to be TN-S but treat as PME' (which means we'd have to take all the PME precautions but still keep and eye on Ze which could be a bit higher like TN-S).

       - Andy.

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  • 0

    I need to know the supply type, see picture. 

    The DNO seem to have provided an Earth terminal - so provided that's working, it's TN. Just about every UK DNO says to treat their earth terminals as PME unless there's some explicit agreement that it isn't (which is unlikely unless this is a caravan site or marina) - as if it's not PME now it's likely to be in the future. They don't even have to change anything at the head to make it PME - just re-do some joints under the road or on poles.

    Really we could do with a box on the forms that says ‘Appears to be TN-S but treat as PME' (which means we'd have to take all the PME precautions but still keep and eye on Ze which could be a bit higher like TN-S).

       - Andy.

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