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More people watched the Logan Paul vs. KSI fight on Twitch than on YouTube | 220v Contactor Relay

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I am certainly not suggesting HVACR techs engage in performing work outside of their skills or licensures, but, in many cases, being able to identify the problem and making the repair are two different things.

Dumb question but in wiring up a bench setup as described – in what order should the isolation transformer, RCD and isolator switch be connected up. RCD on mains side of transformer along with isolator? Double pole isolator for live and neutral? Maybe add a suggested circuit diagram to the excellent article and improve readership safety even more.

Please nobody get one of these boards. It is not a safe design for working with mains voltages. This guy has not followed guidelines for minimum creepage and clearances between the low voltage and mains side. You think it’s optoisolated and it may work fine for the majority of the time, but as soon as a mains voltage spike comes along it could bridge the gap and zap your circuit and you if you’re touching it (and your computer if you’re doing doing dev work at the time).

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The 40 Gallon Hot water tank takes 22 Amps with both element on. And you used a 25 Amp relay. What really happened is you under rated your relay. Solid state or Mechanical does not matter. At the Max for a load it should never use more then 80% of your ratted load of your switch/relay/controller.

UL rule of thumb for shock hazard: 1.5mm / 60mils distance between a hazardous live conductor and something touchable for single insulation level protection (double that for double insulation).

That’s also a mistake in the article, because the house ground doesn’t exactly ground the house. It just grounds the appliances. You can still have thousands of volts between a table and the wall socket ground in a thunderstorm. Even on a normal day, you have about 100 Volts per meter in potential difference just from atmospheric charges, which is why it’s a bad idea to ground the computer you’re working on unless you also ground the table, the chair, the floor and yourself.

Low current (and damage-reducing high-frequency skin effect) on the Tesla coil’s HV secondary. Mains frequency penetration, arcability and cross-heart lethal current on the neon sign transformer’s secondary. So, it’s good that my wakeup call went in & out of the same arm.

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The MOT cores are welded to the head, so they’re not coming loose without shearing. The sole purpose of the epoxy would be to keep the coils mounted to the cores (as well as keeping them free of damaging debris that would short the coils.) The only force the epoxy sees is from the eddy currents trying to push the coils away from the core (or vice-versa.) That energy then becomes the electromagnetic force that gets “transferred” to the ferrous cores – that are welded to the head. Since the force from the eddy current is fairly weak, there’s an low extremely low risk for such a failure. Not impossible, but it would take a catastrophic failure.

Exposure. The Sony A33 offers a selection of exposure modes commonplace on any DSLR, as well as several more unusual modes. These include Auto, Auto+ (Advanced Auto), Programmed AE, Aperture Priority, Shutter-speed Priority, Manual, Continuous Advance Priority AE, Sweep Panorama, Scene, and Flash Off modes. The Advanced Auto mode acts much like a regular Auto mode, taking control of most settings, but differs from the standard Auto mode in that it can also access some of Sony’s more unique multi-shot modes, such as Handheld Twilight and High Dynamic Range. Continuous Advance Priority AE increases the maximum burst shooting speed as compared to the standard Continuous Advance modes, but does so by requiring the aperture be fixed near its open position. The Sweep Panorama mode can function in either 2D or 3D variants, and allows capture and in-camera stitching of multi-shot panoramic images by simply pressing the shutter button and sweeping the camera across the subject. A selection of user-friendly scene modes accessed through the Scene position include Portrait, Sports Action, Macro, Landscape, Sunset, Night view, Hand-held Twilight, and Night Portrait, and let beginners get the look they’re aiming for, without needing to understand the subtleties of shutter speeds, apertures, and the like.

The earth ground connection won’t prevent you from being shocked unless it’s a GFI outlet. The soil resistivity in most places in the US doesn’t cause enough current to flow to earth ground to trip a normal breaker. Bonded ground systems are better, but if the bond from neutral to earth ground is far away from the short it might still not trip a normal breaker.


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