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Hi. I’ve just tested a friends DB and it recorded a Ze of 0.50 ohms on a TN-C-S with an 80amp fuse is this ok. As the DNO state that the 0.35 ohms is for 100 amp..
Discuss Ze of 0.50 ohms on a TN-C-S system in the The Welcome Forum area at ElectriciansForums.net
If all his Zs reads are within parameters he potentially can. Let's be honest in domestic the R1 +R2 is so low the Zs is normally way under the permissible.Out of interest if the dno does say it’s ok what’s his next move? Obviously he can’t work on the installation and recited a Ze within what’s acceptable,still learning so these things keep me awake at night......
I know what I’m reading tonight, thanks.For a bit of a read on such things have a look at Engineering Recommendation P23/2:2018.
Out of interest if the dno does say it’s ok what’s his next move? Obviously he can’t work on the installation and record a Ze within what’s acceptable,still learning so these things keep me awake at night......
Apparently 0.35 ohms is the typical maximum.Regardless of what the DNO say he records the measured Ze on the certificate, and if everything else complies then no problem.
The figure of 0.35 is a guideline typical value, not a fixed maximum permissible value.
As long as the Ze of 0.50 is stable and all circuits comply for Zs then it is fine.
Reply to Ze of 0.50 ohms on a TN-C-S system in the The Welcome Forum area at ElectriciansForums.net
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