Electronics > Projects, Designs, and Technical Stuff
Earthing mains power supply
ocset:
The neutral and earth should not connect in the consumer unit, only the network operator is allowed to connect them in the service terminal equipment (head) to create a TN-C-S system.
But as the earth is already tied to the neutral, TNC-S, then it is a good bet that this will not change. I cannot see any need for additional earth electrodes unless a car charging point, or similar, is being added.
themadhippy:
--- Quote ---The neutral and earth should not connect in the consumer unit, only the network operator is allowed to connect them in the service terminal equipment
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There is a very rare beasty called TNC were neutral and earth are combined on the consumers side.Its also known as concentric earthing as the earth/neutral conductor must surround the phase conductor.Ive only seen 1 example in the wild and that was a long time ago.
Zero999:
--- Quote from: Monkeh on June 29, 2020, 04:47:14 am ---
--- Quote from: Bassman59 on June 29, 2020, 04:43:53 am ---
--- Quote from: akis on June 28, 2020, 07:22:59 am ---"I'll see your radiator clamps and raise with bonding metal window frames in the bathroom."
If I understand correctly you are saying that one should only earth an electrical device that has a chance of exposing its live power to its metal chassis, but one should not earth a passive device like a radiator?
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I read it as radiators (and the metal window frames) are a sufficient ground, rather than a proper ground going back to the panel.
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.. no, they're absolutely not.
There was some minor insanity regarding bonding every metal object you could possibly touch to earth. It was, indeed, insanity, and we now only concern ourselves with objects capable of introducing a (sufficiently low impedance) potential.
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The UK wiring regulations are like that: pretty much all metalwork in a building needs to be bonded to earth.
themadhippy:
--- Quote ---pretty much all metalwork in a building needs to be bonded to earth.
--- End quote ---
Not necessarily so anymore https://electrical.theiet.org/wiring-matters/years/2019/76-july-2019/protective-bonding-habits/
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