Are you saying that, unless someone screws something into it (in the wall) no part of the metal frame (nor anything which was in electrical continuity with it) would be 'touchable'?Essentially not extraneous but potentially could be if someone screws a conductive shelf or rack to the wall for example.
Exactly. Not exposed until someone makes it so will be bonded. The structures is sat on a concrete raft on a plastic membrane. Floor is lino on timber so I don't see that being an issue.Are you saying that, unless someone screws something into it (in the wall) no part of the metal frame (nor anything which was in electrical continuity with it) would be 'touchable'?
That could be the reinforcement fabric contained in the concrete slab, which will be far better than a single electrode.it is recommended that an earth mat or earth electrode of suitably low resistance, e.g. 20 ohms or less, be installed and connected to the protective equipotential bonding.
Where a PME earthing facility is used as the means of earthing for the electrical installation of a swimming pool or other basin, it is recommended that an earth mat or earth electrode of suitably low resistance, e.g. 20 ohms or less, be installed and connected to the protective equipotential bonding.
But loss of the PEN can cause problems ...
That would be a 'solution', but it would be reliant on most/all installations having such an arrangement - since if just a few of the installations affected by a 'lost TN-C-S neutral' disconnected the PEN, currents through bonding in the remaining affected properties could rise.So are we back to a breaker that disconnects everything (including PME earth now) from the supply if there's excessive voltage/current between PME earth and a local earth rod ? ...
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