Charting the S&P 500’s range-bound, but bullish, (unofficial) summer start | Circuit Breaker Parts

On an MV distribution there is no neutral or ground wire, just the three phases with a delta / star transformer to make the LV.

Handheld Twilight is a scene mode on the Sony A33 and A55, so it doesn’t offer you much control: The camera picks the ISO setting, shutter speed, etc, that it thinks is best, and takes the picture. About all you can control is whether to enable face detection AF or not. For those wanting the multi-shot advantages but with more creative control, Sony offers Multi-Frame Noise Reduction mode. This mode lets you select the ISO you want to use, but the camera micro-aligns and averages together six shots, significantly reducing ISO noise. You get the same basic capability as in Handheld Twilight mode, but retain full control over other exposure parameters.

I suppose it’d be a case by case thing. But I wouldn’t want to give an insurance company another excuse not to pay out.

• Lightning: In fact, transients induced by lightning are not the result of a direct strike. A lightning strike creates a magnetic field that can induce large magnitude transients in nearby electrical cables. A cloud-to-cloud strike can affect both overhead and buried cables. The outcome also is unpredictable—a strike that occurs a mile away can generate 70 V in electrical cables, and another can generate 10 kV from 160 yards away. • Inductive-load switching: Generators, motors, relays, and transformers represent typical sources of inductive transients. Switching inductive loads on or off can generate high-energy transients that intensify in magnitude with increasingly heavy loads. When the inductive load is switched off, the collapsing magnetic field converts into electrical energy, which takes the form of a double exponential transient. Depending on the source, these transients can be as large as hundreds of volts and hundreds of amperes, with durations of 400 ms. Due to varying load sizes, there will be variance in wave shape, duration, peak current, and peak voltage of the transients. Once these variables are approximated, circuit designers will be able to select a suitable suppressor type. • Electrostatic discharge (ESD): This energy is the result of an imbalance of positive and negative charges between objects. It’s characterized by very fast rise times and very high peak voltages and currents.

I have to say up front that I’ve never been a fan of EVFs. While they do permit much more information overlay than conventional optical viewfinders, I’ve always felt that EVFs’ limitations have outweighed their advantages. In particular, EVFs usually have limited sensitivity and dynamic range, not to mention low refresh rates and poor resolution when compared with the view through a conventional optical viewfinder.

The thing about the picture that worries me is the receptacles seem to be mounted below 18 inches from the floor. That is a BIG NO-NO. IF there are any gasoline cans in the garage for an old lawn-mower, etc then he has just created an explosion hazard.

Similarly in the Senate, Republicans’ slim 51-49 majority means that Flake’s defection could be enough to help sink a nomination, or at the very least trigger a tie-breaker. In the case of Farr, Democrats have mounted an aggressive push to block his nomination. Given Flake’s current stance, if they can convince just one more Republican to switch over, they could successfully take it down.

The mechanisms that take place if a big shock happens (big = high current, not voltage) is that it cooks the muscle so even though you sort of feel OK within a few hours the blood coagulates, you start to ache like you would not believe and you suffer a horrible painful death.

Not always, you have to think on a global scope here before saying generalizations! In the UK a lot of houses are on what they call PME or protected multiple earths, where the earth bond goes back to the substation as a extra conductor. If you are in one of these properties and are not aware of it, and have your own ground system or leakage you can end up being lower impedance than the substation ground and grounding out faults in your neighbors properties which are also on the same bond. Where I am in europe, all the houses are individually bonded to their own low impedance earth, and the inspector comes out with a megga tester and tests its impedance before they will sign you off to connect to the public supply. It has to be below 50ohms total from any gnd pin on any socket in the property I remember from my inspection. I laid a load of mesh subfloor before pouring the floor so I had no problems with meeting spec. A nice low impedance earth will make your rcd and protection devices even more sensitive also.

▲ 仲鑫达配备资深的PLC可编程(自动化系统)技术工程师以及制氢系统设计开发工程师

Opto-isolated TRIAC is fine and dandy, but there is no fuse, so if you overload it, you have a cooking TRIAC in your junction box …

Most significantly, today’s Corolla arrives sat atop the Toyota New Global Architecture (TNGA), a complex name for underpinnings that, in this form, have already demonstrated considerable promise in cars such as the high-selling CH-R SUV, hybrid Prius and soon-to-be-on-sale Lexus UX.