NZS6116:2006 Metal Enclosure in equipotential zone
Posted: Wed Apr 12, 2023 2:06 pm
I have a stainless steel control cabinet located in the equipotential zone for a stunner.
This cabinet has a supply via the installation MEN earthing system and is earthed via the PEC of this final subcircuit.
Should this cabinet also be connected to the equipotential bonding system?
It doesn't seem right have a localized equipotential zone connected to its own earth electrode that could then end up at two different potentials, in fact it seems dangerous.
I can't see anything that restricts the connection of a bonding conductor to this cabinet in section 3.4 an although this adds another earth electrode to the installation I can't see this being worst than the possibility of two different potentials.
However table 2 number 7 in section 4 says "no directly wired connection from the equipotential bonding bar is connected to the MEN supply earth" and references 3.4.1.
Anyone able to clarify of shed some light around this for me? Should my cabinet be connected to the bonding network even though it has an earth from the MEN supply.
This cabinet has a supply via the installation MEN earthing system and is earthed via the PEC of this final subcircuit.
Should this cabinet also be connected to the equipotential bonding system?
It doesn't seem right have a localized equipotential zone connected to its own earth electrode that could then end up at two different potentials, in fact it seems dangerous.
I can't see anything that restricts the connection of a bonding conductor to this cabinet in section 3.4 an although this adds another earth electrode to the installation I can't see this being worst than the possibility of two different potentials.
However table 2 number 7 in section 4 says "no directly wired connection from the equipotential bonding bar is connected to the MEN supply earth" and references 3.4.1.
Anyone able to clarify of shed some light around this for me? Should my cabinet be connected to the bonding network even though it has an earth from the MEN supply.