Can you create, and how safe it would be, isolation transformer with two transformers? so, secondary of first transformer connected to secondary of second (2:11:2) ? In my naive thinking head, it should work. i have few microwave transformers with modified secondary (about 20-30V output from 220V input), and was thinking of using two of them…
Full-time autofocus. There are several advantages to the use of a translucent mirror in place of a traditional single-lens reflex mirror mechanism. The Sony Alpha A33 uses the design to allow it to simultaneously provide a live view feed with full-time phase detection autofocus. Most of the light is transmitted to the image sensor, while a smaller portion is delivered to the phase detection AF sensor, where it can be used to perform focus adjustments — even during live view, high-speed shooting, and movie recording.
It’s an ultimatum that hits at Republicans’ narrow margins in the Senate (which will be wider when the new Congress starts in January).
I’ve also experienced very similar shocks, mains flowing from one hand to another by trusting my co-worker. I couldn’t move my arms and upper body, couldn’t scream, breathe or even see during the shock. I don’t know how long it lasted and there was nobody nearby. Luckily my brain and lower body was still partially functional and I somehow managed to kick the wall in front of the, to disconnect myself from live connections. Some of my fingertips were smoking. I learned my lesson as well – never trust anyone, especially if they are repeatedly assures you that the power is down.
Typically, drivers are rated to handle surges in the range of 1 to 4 kV. The varistor, ranging from 7 to 14 mm in diameter, is usually located downstream of the fuse on the ac mains. However, to provide higher-level surge immunity for lighting installed outdoors in exposed surge environments, outdoor-lighting OEMs may want to add surge-protection devices (SPDs) on the ac input lines of their luminaires ahead of the LED driver.
A coworker at JPL got bit by an ion pump supply. On-site health unit recognized abnormal EKG, sent him to ER. ER doctor diagnosed a congenital abnormality unrelated to the incident. But he ended up with a date with a nurse, so he considered it a worthwhile exercise.
On Demand Refrigerant Safety Classes A2L and A3 have a very low GWP, making them a strong, long-term solution for many HVACR applications. However, these refrigerants are classified as mildly flammable and highly flammable respectively. This flammability class raises safety and compliance concerns. This webinar will help you understand these classes, along with the opportunities these refrigerants can offer.
SSRs can actually contain what is used here: optocoupler+triac or they may use optocoupler+mosfet. Just like individual triacs you will find that they suffer from the same issue: high power dissipation. A quick looks shows BT137 will burn 20W to switch a 5A load, I see 6W for the first 10A SSR I encounter. This is too much to dissipate in a small junction box isolated inside a wall. Meanwhile, a 10A relay will dissipate maximum 2.5W through the 0.1ohm contacts.
I use mains power for my bed on both of my 3D printers. It’s controlled from RAMPs exactly the same as a 12v bed would be with the exception that the signal from the RAMPs board is used to trigger a solid state relay. I use a standard silicon heat mat: https://www.google.com/search?q=3m+heat+mat&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjawpmuoOPJAhVFtIMKHXC1AO0Q_AUICCgC&biw=960&bih=557
Heat pumps are good as pre-warmers but it’s hard to get really hot water from one without wasting a lot of electricity in the process as you exceed the “point of diminishing returns”. Natural Gas is still the cheapest most efficient way to heat water because it’s fairly easy to make a 95% or better efficiency burner. In Canada you’d likely have to go geothermal which in most cases is nothing but a heat pump hooked to an underground water loop
With the start capacitor out of the circuit, the motor becomes a permanent split capacitance (PSC) motor in the running mode only.
The outlet on your wall is likely on a 15 amp circuit, so in many cases, the Smart Plug can handle as much power as the breaker or fuse can. To see what the power requirements of many electrical devices are and what type of load they create, you should visit Electrical Safety First. It’s a site based out of the UK, but the power ratings for products are the same no matter which country you use them in and the charts here are an invaluable tool.
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