http://www.mikeholt.com/technical.php?id=grounding/unformatted/GroundResistance&type=u&title=Ground%20Resistance%20-%20It%27s%20Not%20What%20You%20Think%20%2812-30-99%29
My situation is a good example. I just purchased a new house and unfortunately it does not have a garage. Until I get the garage built in the Spring with a NEMA 14-50 outlet, I’m going to rough it with L1 at 120V/15A.
Agree on stupidity, but psychopaths have gotten an undeservedly-bad rap. See this: http://www3.nhk.or.jp/nhkworld/en/tv/firstclass/201604140600/ I’m proud to say that I scored 19 (average-level psychopath) on the the quiz that was presented.
Though, how ever, even with a heat pump, one could lower the power bill a bit more if one takes the power when it is cheapest.
Once you’ve established these ground rules you can then tailor your approach based on a realistic expectation of the risk involved. This process might seem rather long-winded, but in practice it should only require a moment’s thought. It’s infinitely better to take that moment to think than get an unexpected and possibly lethal high-voltage electric shock.
Yup, switched off but still plugged in, that way the case is still earthed. Assuming a sensible 3-pin plug, or whatever the hell they do in places with just 2.
Lenovo is announcing a second ARM-powered Windows 10 laptop this week, and this time it’s a Yoga. The Lenovo Yoga C630 WOS (Windows on Snapdragon) is, as you might have guessed, powered by Qualcomm’s latest Snapdragon 850 processor. It’s the first Windows laptop we’ve seen with the Snapdragon 850, and its a chip that Qualcomm specifically designed for always-connected Windows 10 PCs. This new processor ushers in the latest generation of ARM-powered Windows 10 laptops.
I prefer polycarbonate chassis with see-through lids. That facilitates continuous inspection while the device is in operation. I do agree that an output circuit breaker is not a bad idea. I’m comfortable with relying on the individual breakers on the input circuits combined with the two primary relays, which rather indirectly achieve the same purpose as the trip bar.
Retired engineer, 71 years young. Computer builder and programmer. Linguist specialising in language acquisition and computational linguistics. Interested…
The only thing I would add would be a (redundant) circuit breaker (Airpax, Heinemann, et al) on each input that was two-pole with a common trip bar. That, and I would build it in a metal enclosure.
The leads on that TO220 case SCR and that solder trace are not going to handle 20 amps continuously without heating up. A SCR that’s up to the task of carrying 20 amps for hours on end would have a TO-218 case or even be stud mount. If all else fails you could just use a contactor relay which is what they normally use for this application.
We frequently come across warm circuit breakers, warm dimmer switches, and even warm electrical panels during our home inspections. So how warm is too warm? It depends. I know, it’s kind of a blowhard answer, but there’s no one-size-fits-all answer.
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