Google reportedly paid Andy Rubin $90 million after he allegedly coerced sex from employee | 220v Contactor Relay

You do in fact need to be a licensed engineer/electrician to design stuff with mains voltage, or you need to have your work inspected and signed for by one. It’s not just a matter of good instruction – it’s illegal for the regular Joe to even repair mains powered circuits beyond swapping a frayed power cord.

Attack of the giant hand? That’s what we called these shots when we took them. Despite the disparity between the size of my hand and the camera body, the grip was still fairly comfortable.

“Main Power” means different voltage in different places. Where I am the mains is 240 Volts and circuit layout is not acceptable for this voltage. I doubt it would even be acceptable for lower Voltage.

Thanks again to the relatively short stature of the Sony A33, the remainder of the rear-panel controls are rather difficult to reach when shooting single-handed, even with the relatively light kit lens attached. There are only a few buttons, Function, Playback, and Delete, plus a four-way controller with a central OK button. This isn’t an issue if shooting two-handed, but you do have to change your grip fairly substantially to reach any further than the top quadrant of the four-way controller. With real-estate at a premium, Sony has only provided markings on the controller for the alternate functions offered during shooting (and in the case of the Up / Display button, during playback).

I did find the small body and grip a little problematic when shooting with a long or heavy lens, though: I spent quite a bit of time with the excellent Sony 70-200mm f/2.8 mounted on the camera, and did experience some wrist fatigue by the end of the day. Since the camera is capable of very fast live autofocus during video recording, I often found myself wanting to zoom during the recording, something that would be anathema on a conventional video-capable SLR. Doing so required that I carry more of the weight of the lens/camera assembly on my right hand, so my left could operate the zoom ring more smoothly. The result was a lot of weight for my right wrist to carry, and the small grip made it more difficult than otherwise. When shooting normally with smaller lenses, though, I never found the grip uncomfortable.

The UMC equipment included with the Model 3 LR can supply up to 32 amps. That’ll charge at a bit over 30 miles an hour.

“Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”

I’ve not tried to account for phase differences (that is, power factor). It’s very naive. I measure the current via a CT and compute RMS across a whole cycle, then I find the peak voltage and do the math.

If a consequence is human death then obviously that is completely unacceptable. If it blows a fuse at 1000V then good! If traces vaporise disconnecting the mains at 10,000Votls then well done! Where is the weakest point (lowest creepage clearance for the exposed voltages) and what are the consequences of a flash over at that point.

Kapton tape is nice but I know it peels and needs replacing eventually. You wouldn’t legally be able to sell something using just tape as a mains insulator. Glass can break. It’s a small chance, but risk should be proportionate to the danger when things fail. You might sometimes have metal screws or whatnot on the bed if you’re assembling a couple of pieces there. Best not to mess.

I probably ought to be dead, or have some scars at least, but apparently I’m a very resistant person.

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