25 things to do before Aug. 25 – Edinboro University News Detail | 25 Amp Circuit Breaker

Japan is odd for another reason. The two “halves” of the country are on different frequencies. I believe the West is at 50 Hz and the East and North is 60 Hz. They have a collection of DC interconnects in the middle of the country to facilitate power sharing across this otherwise intransigent gap. Since the shutdown of Fukushima, those interconnects have been under quite a bit of strain, but that’s a whole ‘nother story.

I’ve never used a 3D printer but I imagine the printer nozzle is conductive – a small misalignment, the nozzle breaks through the solder-mask, your whole printer then becomes live, blowing up the PC connected to it at the same time.

You really should drop the 110/240 volts statements and use 120/240 volts for residential installs. I don’t think 110 volts has been used since Thomas Edison.

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You know very well, I hope, that for dimming you need to use a random phase optoisolator not a zero-crossing one. Like MOC3020/21 for example. This is in the command/trigger circuit for the Mains swiching Triac. Now show us your Relay driven dimmer beauty concept. Is good to learn something new everyday.

I’m cynical that the non-tetany behaviour of AC results in being able to pull away. Remember that mains is oscillating at >50 x a second, so the pull-away would have to be within that cycle, as well as overwhelming the hyperpolarisation and ignoring the fact that normal neuromuscular signals are essentially pulse-frequency modulated with saturation causing desensitivity (I.e. A continuous signal is ignored)

Although we bumped into each other on job sites, we had different employers. I knew his family and I wasn’t about to ask them about the details of course.

continuing akismetuser212339447″ Using a mechanical relay for your thermal control _may_ make you crazy with the clicking. If you think you can take the madness, keep an eye on the make/break current rating, and the lifetime switching at the design current. Switching current and voltage is often far less than carrying current, and electrical contact life is short compared to mechanical life (Switching at zero crossing will help). Also note that failure mode of relays is possibly contacts fused closed – design with safety in mind, and have some sort of feedback. Something like a thermal cutoff fuse?

Anyone that knows me really well, especially family members, is surprised/amazed that I’ve managed to be over 50 and still more or less bilaterally symmetrical, without too many visible scars.

You neglected to mention the Geiger-Muller counter and the Anthrax detector. Nothing short of criminal negligence to work without either one.

I had my own suggestions further up in the comments here, and I’d like to believe I expressed them respectfully, and TJ addressed them. And, as is appropriate, the article text has an exhortation to not play with HV power without due care.

Step 2:  To determine which MOV disc size to use, first identify the MOV series that minimally meet the 1000-A surge requirement. Inspecting the table above suggests a 20-mm MOV with a 31-V dc maximum continuous voltage rating (part number V20E25P) as a possible solution to meet the requirements.