- Reaction score
- 2,853
Thanks . . .434.5.1 as Julie said. Section 3.3 OSG, section 3.5.3 of GN1? I have an old copy so this may not be correct.
Discuss TNS Ze 0.8Ohms in the UK Electrical Forum area at ElectriciansForums.net
Thanks . . .434.5.1 as Julie said. Section 3.3 OSG, section 3.5.3 of GN1? I have an old copy so this may not be correct.
I stand corrected! Can someone please point me to where I could read a bit more about this. Can't seem to find anything about it in the BBB, OSG or GN3.
Clearly that maximum Zs value would not be applied to a TN fed circuit despite being compliant. If the measured Zs got much beyond the value that would be expected then other factors in the circuit design or earthing system would be suspect. For example lets say a measured Zs of 100 ohms is recorded on a standard ring circuit, either the Ze is way beyond acceptable limits, or the circuit either has a fault or is about a mile long.I also didn't think you could rely on an RCD for fault protection if it is TNS or TNCS. Zs on these systems would almost become irrelevant if we did as they would always be below 1667.
About which bit?I stand corrected! Can someone please point me to where I could read a bit more about this. Can't seem to find anything about it in the BBB, OSG or GN3.
Thanks all. I downloaded the same data you posted Julie and I get it now.
There's quite a lot to this electricity malarky isn't there.
Please.... no more books!It would be nice if they produced a book that gives clear guidance and limits, maybe review it and ammend it every year or two, it would be costly mind but it would remove the ambiguity.
Reply to TNS Ze 0.8Ohms in the UK Electrical Forum area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.