If you hesitate at the thought of doing this math for every system you work on, the NEC Article 110.3(B) states: Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.
Evil Triacs, should be banned by Law anywhere in the World. How is looking a dimmer with Relays? I will love to see a picture. Or an evening filmed youtube video with it, the contact sparks are a free added effect, nice one 
I believe two-man saws bite both directions. And if they don’t, then pretend that they do for the analogy.
Sonos isn’t saying exactly when AirPlay 2 integration will be ready for release. Apple itself has yet to officially launch AirPlay 2 for iOS yet; it’s still in beta testing. So that part obviously needs to happen first. But Sonos has made enough progress to have finalized a list of which of speakers will get it. The Sonos One, second-gen Play:5, and Playbase will be updated with AirPlay 2 support. Older Sonos products — the Play:1, Play:3, and Playbar — won’t be. To help ease the pain and frustration of that cutoff, Sonos says that so long as you’ve got one speaker that can do AirPlay 2 in your Sonos setup, you can group it with older models to make that audio play everywhere. Mac Observer first reported the list of supported devices.
It’s the peak rating. For constant loads, or anything that could be temporarily constant you need to de-rate.
VAC says: “The two 120V legs are *in phase* with each other.” Of course they are not. *by definition* if they were in phase there would be no voltage difference between them. The two 120V legs are 180 degrees different from each other, so the difference between them is 240V. Which is (of course) the supply voltage.
400 Hz is the frequency of choice for aviation. That’s why the PA system in airplanes has *that* particular background tone in it.
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.
Heat is an issue at high current for sure. But you only need a few milliamps (approx 200) across the chest, to disrupt your heart to kill you.
i have 300w 12v silicon heat bed i just use a 700w pc power supply and 70A relay it heats bed over 100 oC in about a minute no problem
Some customers get sticker shock, but I’m not trying to rip you off. You only see the half-hour of work I did in your home, but that’s not the whole story. I spent years training, and now I need to pay my crew (who went out of their way to get to your home), plus deal with marketing and other costs of running a business—and my prices reflect that. Learn 11 more secrets contractors wish homeowners knew.
I also own an electric kiln designed to heat and temper glass so a page can be taken from that design. I haven’t made the effort to investigate the heating elements as of yet.
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