Xiaomi’s Redmi Note 4 has a big 4,100 mAh battery and a tiny price tag | Lrd12 Overload Relay

And this AC vs DC case when it comes to skin effect, is a reason for why some Data centers use DC distribution, as most server products uses switch mode power supplies and therefor has an internal bridge rectifier.

I can’t remember the exact numbers, but before the change, UK mains voltage was acceptable between something like 210V and 270V, depending on grid load. EU mains had a similar range. All they did, was tighten up the range. So now it’s nominally 230V, with 240V being within acceptable range. Which is good because the voltage stayed exactly the same. They just trimmed the range at the top end to be within the EU standards.

I bought an optically isolated unit that is a “Solid State Relay.” ( SSR)The insides are some kind of zero crossing SCR/TRIAC I’m sure but the key is that the input is a logic signal at a few ma anywhere between 4-30 VDC. This unit is rated to 250VAC at 50 amps. I use it with a foot switch and DC wall wart to turn my welder on and off. It DOES require a beefy heat sink for that kind of power but it hasn’t even broken a sweat (my welder uses around 40 amps give or take.) I would strongly recommend adapting this circuit to take advantage of one of the many available SSR’s out there and let a professionally made and UL certified device handle the mains side. You just drive one of these with the GPIO side here. Of course you can use a much smaller unit for doing the typical 15 Amp light circuits. I actually used such a unit controlled by an Arduino to switch a hot plate (1000 watts) on and off for my flow soldering rig where the Arduino automates the solder temperature profile. I think it is best to marry our “hacks” to these commercial components that have proven performance/certification for our mains. My two cents ‘

They do not connect 240VAC , they connect 24v DC with a 15A source. Remeber AC is a sine signal, you don’t want a signal that turn off 60 or 50 times per second.

With mains electricity, always work one handed or wear live like I did in the day, 11KV gloves when testing 11KV circuits via test probes.

Neutral is connected to Earth Ground at your electrical panel. Circuit breakers interrupt the LINE only so I’m not sure what you mean by soil resistivity and current flowing in earth ground. 500 micro amps flowing or rather, leaking through Earth ground is usually all that’s allowed by UL in cord-connected products.

High-end professional SLRs drop the mirror between exposures, providing a direct (however brief) view of the subject between shots. In contrast, in their highest-speed capture modes, the Sony A33 and A55 display a static image of the shot they’ve just captured. Rather than seeing interrupted glimpses of your subject in motion, the A55 displays a procession of still images, each lagging the subject motion.

I’d like to say that I’m also grateful to TJ and other contributors for their contributions, inputs and replies, I did learn things and this increased my awareness of potential hazards. [I’m basically a SW developer doing 3.3V electronics, so any insight on mains operations from those who have experience is welcome.] Even though there may be some unwarranted background noise, the discussion is interesting, and dealing with mains surely is worth a few questions. Not knowing is not a problem, not wanting to learn or daring to ask is…

Step 3: Use the pulse-rating curves (Fig. 2) in the same datasheet to determine pulse capabilities relative to the 40 pulses at the 1000-A requirement.

I didn’t buy one, largely due to some compromises in the plug-in version. The very high load floor in the cargo area was a big downside for me, as it really limits cargo space.

The one negative that most stands out in my mind for the Sony A33 actually has the least to do with its abilities as a camera. The first thing that comes to mind when thinking about shooting with it isn’t whether I’ll be able to bring back the shots I want with it, but rather whether the battery will last long enough to do so. We have no doubt that the Sony A33 will meet the fairly generous shot-life numbers quoted under the CIPA specs (340 shots with the LCD, 270 with the EVF), but in actual practice, with the camera rattling off hundreds of shots in amazingly short order, what most struck me was just how fast I seemed to run out of battery life. It’s quite easy to run through a full battery in just a couple of hours of active shooting, and two batteries should be considered a minimum for a day of serious shooting.

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