Should electricians assume TN-S and TN-C-S are both PME earthing systems.

When electricians are working on a TNS earthing system should they consider that it may change to TNCS in the future? This could happen when the DNO, distribution network operator, repairs or upgrades the electricity supply around the installation area.

eFIXX electricians question and answers are selected from comments on our youtube videos or other social media accounts.


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Gary Parker - Technical manager - Electrical Contractors Association. (ECA)
Joe Robinson - Technical editor eFIXX

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