Ze external earth loop impedance | on ElectriciansForums

Ze external earth loop impedance

Discuss Ze external earth loop impedance in the Periodic Inspection Reporting & Certification area at ElectriciansForums.net

S

Simon Hall

Hi I've done a Ze test on a TNS system and it's come back as 0.14 ohms is this reading ok as the max is 0.8 is there not a min amount you can have thanks
 
reading is fine. there is no minimum specified. damn good earth. i frequently get around 0.2.
 
ArseyDee said:
Am always a little suspicious when questions like this pop up from new members during one of Glen's bans! :)
Click to expand...

He isn't banned again is he!
 
1 week. for posting a picture of a pair of ----. wonder if this picture of a single --- will get me a ban.

[ElectriciansForums.net] Ze external earth loop impedance
 
Simon Hall said:
Hi I've done a Ze test on a TNS system and it's come back as 0.14 ohms is this reading ok as the max is 0.8 is there not a min amount you can have thanks
Click to expand...

Just means your damn near a local DNO distribution substation... lol!! Start worrying when you're getting values 00.4 ohms!! lol!!
 
And, just to point out something else.... there's not really such a thing as a maximum Ze value, either, as they don't officially exist. Neither BS7671 nor ESQCR contain the mythical figures of .35 and .8 for TN systems so the DNO's are quite at liberty to deliver as they wish. The only which IS set in stone is that circuit max Zs figures have to be achieved.
 

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