ebee:
What is the solution for an ordinary person with a newish house (TNC-S) having an outside socket probably connected to installation earth terminal rater than a separate rod and deciding to hook up their caravan in the drive to their household mains power. Do we warn them it could compromise safety or do we leave `em to it?
Zoomup:
ebee:
What is the solution for an ordinary person with a newish house (TNC-S) having an outside socket probably connected to installation earth terminal rater than a separate rod and deciding to hook up their caravan in the drive to their household mains power. Do we warn them it could compromise safety or do we leave `em to it?Just how conductive is drive block paving on sand or tarmac?
Z.
I would imagine that it could be quite conductive at times Zoom
ebee:
What is the solution for an ordinary person with a newish house (TNC-S) having an outside socket probably connected to installation earth terminal rater than a separate rod and deciding to hook up their caravan in the drive to their household mains power. Do we warn them it could compromise safety or do we leave `em to it?
mapj1:
I do not think we should talk about 'the' earth voltage as if there is some 'plate at the end of the universe' (apologies to fans of Douglas Adams) at zero volts and we must connect to that by putting an electrode far far away. This is a simplification that makes text books easy to write.
Rather I think there are many things we can refer to as 'an earth', but these are not always at the same voltage as each other.
What I think is more important for the shocked user is the local voltage gradient - we need the car, caravan or boat to have the smallest sensible offset voltage relative to whatever else is in touching or stepping range.
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