Hi,

We have visited a large site, where the on-site electrical team have advise us that the supply is a TNC-S, but they have a global earthing system.

What is a global earthing system?
What size earthing conductor ?
What size bonding conductor?

As 1 TX supplies many building from one main panel, what should the earthing and bonding conductor be? Each building as a earthing cable which goes to a rod i Believe?

Looking for clarification on this.

Thanks
Malaysia

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