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Max Ze values from DNO

Marc Lambert

Hi, long time no posting, busy busy I'm afraid.

Concerning supply Ze which is usually quoted as 0.35 max for TNCS, 0.8 for TNS.

On unmetered highway supplies UKPN says

Makes perfect sense as the fuse size (time and Ia)  dictates the max Ze. 

So where did the .35 and 0.8 come from, or go to in this case.

Kind regards

Marc

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  • I suspect it relates to UK Public Utility Networks and not domestic installs, which specifically states 5s disconnection for fixed lighting equipment.

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  • I suspect it relates to UK Public Utility Networks and not domestic installs, which specifically states 5s disconnection for fixed lighting equipment.

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