Upgrading supply/dno earthing

[RF Lighting]

It sounds like the circuit hasn’t been designed properly if you’re having to rely on the bonding to get a satisfactory Zs reading.

 

[JohnW2]

It sounds like the circuit hasn’t been designed properly if you’re having to rely on the bonding to get a satisfactory Zs reading.

Indeed so, but those who, when inspecting the circuit, 'rely on' direct Zs measurements (rather than R1+R2+Ze) will presumably remain unaware of that deficiency in design of the circuit?

... which leads me to wonder how many others, like you, do not rely on Zs measurements?

Kind Regards, John

 

[RF Lighting]

Found a non RCD socket outlet on my travels today.

Low current (top) and high current (bottom) Zs test carried out.

 

[JohnW2]

Found a non RCD socket outlet on my travels today. ... Low current (top) and high current (bottom) Zs test carried out.

Interesting. Thanks, and consistent with what secure suggested. Do you have any thoughts about a possible explanation for the difference?

... and, of course, importantly, what was the R1+R2+Ze at that socket? (you did measure it, didn't you? )

Kind Regards, John

 

[RF Lighting]

I’m not sure why this happens. Perhaps it’s harder to get an accurate reading at lower current or maybe it’s a scaled up reading from a smaller actual reading relative to the lower current.

Sorry no calculated Zs I wasn’t actually working on this circuit. I just tested it for this thread!

 

[JohnW2]

I’m not sure why this happens. Perhaps it’s harder to get an accurate reading at lower current or maybe it’s a scaled up reading from a smaller actual reading relative to the lower current.

I don't know. In the end, it presumably comes down to measuring a current (or the voltage across a known resistance) and that can be done accurately from microamps up to mega-amps

Sorry no calculated Zs I wasn’t actually working on this circuit. I just tested it for this thread!

Fair enough. If the opportunity to find out ever presents itself in the future, it would be interesting to know which of the Zs measurements was closer to the 'calculated' figure.

Kind Regards, John

 

[Michaelsf90]

ENW turned up yesterday. The guy took a load of pictures and said it all needs replacing. He said someone will ring. If I haven't heard anything in two weeks to ring up and chase it up. Theyll have dig drive up. Cut into the cable and run new in. Itll still be a tns supply. Just need to chase up the supplier to see if the economy 7 can be ditched to free up some room

 

[JohnW2]

ENW turned up yesterday. The guy took a load of pictures and said it all needs replacing. He said someone will ring. If I haven't heard anything in two weeks to ring up and chase it up. Theyll have dig drive up. Cut into the cable and run new in. Itll still be a tns supply. Just need to chase up the supplier to see if the economy 7 can be ditched to free up some room

Thanks for the update. Do I take it that he did not undertake any measurements of any sort?

Kind Regards, John

 

[Michaelsf90]

No he just took pictures and said yer it needs sorting. He was a nice guy. Didnt do a ze test or anything tho