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tn-c-s

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  1. S

    TN-C-S and earth electrode?

    Why would someone want to go and put one in on a PME system? On a closer examination, I noticed that the main earthing conductor had been removed from the PME cut-out! So, had the spark who installed this electrode just gone straight in, done a Zs which appeared excessively high without...
  2. K

    TN-C-S or TN-S?

    How do you check if installation earthing is TN-C-S or TN-S if in doubt?
  3. C

    TN-C-S + earthing

    Why on a caravan site or some other outbuilding does the earth have to be an earth electrode and not the earthing on the supplying TN-C-S ???
  4. B

    tn-c-s help

    hi all. i may be completely wrong but on a tn-c-s system if i was testing at say a lighting point, lighting circuit breaker off but main switch on then i would have continuity between neutral and cpc, right? but then by my reckoning if i were to then open the main switch then the continuity...

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