Guineafowl's latest activity
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GGuineafowl reacted to sophiecentaur's post in the thread Following up on the recent thread about Earth Resistance measurements with
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We are in different worlds and I need some advice which applies to a particular practical situation in UK. I appreciate your input... -
GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.Yes, I think we’re into ‘tomahto/tomayto” territory here. What you have is TN-C-S with extra earth rods at the installation end. You may...
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GGuineafowl reacted to Averagesupernova's post in the thread Following up on the recent thread about Earth Resistance measurements with Like.
Ok. I suspected as much. Here in the USA the transformer is seldom very far from the service panel. Several hundred feet at the most...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.Various reasons: - A TN-C-S earth is almost always PME (protective multiple earthing), meaning the neutral must be earthed at multiple...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.There are pros and cons to every earthing system.
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.That’s right, a TT earth is the customer’s responsibility, and perfectly acceptable if in spec. The OP requested an engineer visit to...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.I’ve just read this bit again - am I missing something, or did those engineers just walk away from a fault? At least part of your cable...
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GGuineafowl replied to the thread Electromagnet magnetic field issue.I hadn’t heard of that, but I looked it up - on the same site, in two different places, it seems to say two different things...
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GI have often turned nails into "soft iron", by heating and quenching them, for pupils making magnets. This makes the core lose its...
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GThat will change the magnetic properties, but it would actually harden it, and make it brittle. If you let mild steel cool slowly, then...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.Feeble! Your electric shower would draw 40A or so, for a start. My house has 100A*, and it’s just a rural croft house. I’d say you’ve...
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GGuineafowl replied to the thread Electromagnet magnetic field issue.Heating copper to cherry red, then water-quenching, would soften it, but steel would harden. However, mild steel wouldn’t harden...
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GGuineafowl replied to the thread Following up on the recent thread about Earth Resistance measurements.Remember that of the three earthing options, only TN-S and TN-C-S are the DNO’s responsibility. TT is entirely the customer’s. I’d say...
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GGuineafowl replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.What I said seemed to be the conclusion of Veritasium’s experiment? Time to first current pulse in the bulb was 1m/c seconds, determined...
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GGuineafowl replied to the thread When 50,000 volts go through a wire at 5,000,000 FPS - The Slow Mo Guy.A ‘negative’ wavefront? Does an opposite wavefront travel the other way around the circuit? I did see those, and the responses from...