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John Peckham:
If only 3 phases and neutral come from the transformer to the main panel and there is a link between the neutral in the panel and the installation earth then that is TN-C-S (PNB). PNB is one of the 2 types of TN-C-S.
John Peckham:
If only 3 phases and neutral come from the transformer to the main panel and there is a link between the neutral in the panel and the installation earth then that is TN-C-S (PNB). PNB is one of the 2 types of TN-C-S.
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