If we’re are experience NCD when preforming an EICR on a property does this need to be noted on the observations, if so what code should this be given. I’m aware that this needs to be reported to the DNO and should be investigated and rectified.
With a PME system, diverted neutral currents are almost inevitable and not in my view anything to comment upon. The suppliers CNE conductor carries appreciable current with a voltage drop in proportion. Metallic services and structural steelwork provide a parallel earth path and will therefore take some of this current.
Thank you for your response & I also agree to a certain degree, but what current would you say would be acceptable to find within the main earth when the property is under load. In this case I had between 10 to 15A?
Thank you for your response & I also agree to a certain degree, but what current would you say would be acceptable to find within the main earth when the property is under load. In this case I had between 10 to 15A?
what current would you say would be acceptable to find within the main earth
It may be worth a call to the DNO - as they will know the layout of their supplies, and can comment intelligently about what is is reasonable for that particular substation or whatever.
You need to get past the 'have a nice day' girls to reach someone technical, but they certainly will have someone who understands.
I would only be concerned if the main earthing conductor, or anything connected thereto was getting warm or if the diverted neutral current exceeded the supply capacity.
60 amp cut out fuse, and 70 amps diverted neutral current would be bit concerning and might warrant investigation.
Main earthing conductor warm to the touch=concern, hot to the touch=alarming.
