Bitcoin Futures Deliver Wild Ride as Debut Brings Rally, Halts | Circuit Breaker Parts

One quirk of the design of the Sony A33 (and shared by the A55) unfortunately conspires to make this high-speed burst shooting somewhat harder to use than would otherwise be the case. For both the ultra-speedy Continuous Priority AE mode, and the six frames per second Continuous Advance Hi mode, the live view isn’t shown on the viewfinder or LCD panel. Instead, the A33 shows the previously captured image. This makes it harder to follow fast-moving action, since rather than seeing what’s you’re trying to frame, you’re effectively seeing a static slideshow of what happened around a tenth of a second earlier. This problem, incidentally, is also found on all of the SLD’s we’ve reviewed. The Continuous Advance Lo mode, which shoots at around 2.5 frames per second on the A33, does return to the live view between shots, but only briefly — so it can still be a little hard to follow.

I learned even more respect for shock hazards on the job one day when I was working for a military contractor. I forgot to turn off the 400VDC B+ supply to a radar driver assembly before I put one hand on the metal chassis and grabbed the fins of a lighthouse tube with the other hand. After that I put my head down on the workbench and had me a rest for a few minutes. Even when you know better, one moment of inattention can be the end.

#PreferLinux mentioned switching off at the mains socket. Do that, but still test; that saved me once when the switch was faulty. Yes, that socket was replaced, pronto!

I would also use a solid state relay. And I would think about gluing the glass plate with high temp silicone to the PCB. This vastly improves thermal contact and so heat transfer which reduces peak temp and thermal lag in the control loop. Also it prevents exposed live wires even in case the glass breaks.

I find it fascinating how the difference has also impacted the very different “styles” of electrical standards, construction, equipment, etc…the US has had to worry about thermal issues in different ways because of the lower voltage, but that also extended to higher voltage equipment as well, and an overall concern regarding fire (particularly in non-residential installations) when at the same time, we had a lot more natural resources piled around so in the US, we focus heavily on metallic enclosure and grounding (and the fact that our neutrals are meaningful when most Euro outlets are non-polar). At the same time, engineers were far more plentiful (and far less expensive) in postwar Europe than in the US, and the electrician:engineer ratio was very different. Likewise, that’s why NEMA and IEC in many ways are so different (NEMA is overbuilt, maintainable, easily specified but expensive and not particularly precise in application, meant for an electrician to be able to come up with the right contactor, etc.) whereas IEC stuff is more resource- and space-efficient but requires specification. Double-insulation is instead the focus in Europe, which doesn’t need any more metal to accomplish.

But at the very same time, if the rectifier dissipates enough energy for this to be a concern, then it is probably a poorly designed power supply to start with. As most power supplies will be designed for the voltage range of 110 to 250 volts AC. And as it will draw the most current down at 110 volts, then this is where the manufacturer has their specifications chiseled in stone, as if we want 1100 watts, then we need at least 10 amps when we have 110 volts AC on the input. This means that we “effectively” have 5 amps to dissipate per diode.

It doesn’t add up like that. What *does* add up is the power. At 240 volts, you pull twice as much power at 15A.

Uh, maybe i should not post using a foreign language a 01:00 AM… Correction: It should be broken –> It COULD be broken

By not distributing the three wires and only distributing two you try to limit the possible potential between neutral at the sub and neutral at the house by using multiple earths anywhere you can so in this case when lightning strikes the local ground potential rise applies to the ground and to the local end of the neutral/earth wire. Massive currents may flow through that neutral/ground and eventually through the low value resistor at the substation but under no circumstance other than network failure is it possible to get a neutral ground potential of significance with a premise. The low value resistor at the sub limits the current to one that the network can handle.

I would prefer, use a circuit (SCR?) to lower the voltage to around a safer value, where we won’t have any problem in the worse case.

Aluminum is only used for specific applications like very heavy feeds and they have special connections for it. Wire nuts when properly used are very reliable. Push locks are not all they are cracked to be sometimes too. We do have them, I have installed literally tens of thousands of WAGO connectors. Generally we do not use fuses here, almost all circuit breakers and most new houses now have arc detect breakers too. They are used in industrial situations where you have 100A+ service to a single machine.

No, because they are opposite phase. In this setup the neutral wire doesn’t carry any current, so the same 15 amps goes through both hot wires.