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Low voltage DC distribution makes sense in some cases. 12V is pretty low, though: copper losses are still high, so the amount of copper required is expensive for house-scale. 48V uses one sixteenth the amount of copper, and still is below the shock hazard limit. 48V rack systems are mature, common and are a great idea.

True, but I have never seen a product use them. They will probably become popular with wifi powered stuff.

The ESD protective wrist strap should not tie you to a hard ground, it usually has a 1Meg resistor included, just for this reason. But perhaps not every cheap chinese one has?

24v 12a is not that much more at 288watts. I’m sure I’m missing something to do with electromagnetism which makes the secondary unnatractive?

Take a look at the Lennox air conditioning condensing unit tag on Page 19. Notice that the MCA is 28.6 amps and the maximum fuse or circuit breaker is 50 amps. This means it is allowable to install this unit on a circuit breaker rated at 50 amps and a conductor rated at 28.6 amps, according to the NEC’s NFPA 70.

Actually most power panels I have worked on alternate phases as you go down the opposite rows, not one phase on each side, 240 breakers take up 2 breaker spaces on one side of the panel using alternate legs.

You need to learn how to read a datasheet and understand the terms – without an understanding it won’t do you any good.

Agreed…. I used to have a small plastic box in our workshop. It had two copper contacts on opposite surfaces, and a 9V battery, relay and tilt switch inside, and a Caution High Voltage sticker on it,

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You can not do it much more complicated! If you want to heat your print bed by induction, it has to be ferromagnetic to work with a commercial induction cookers coil. And using the copper coil as resistive heater is also no good idea.

Storage and battery. The Sony Alpha A33 offers a single flash memory card slot, but it’s compatible with two memory card standards, each with various permutations. The first is Memory Stick PRO Duo / PRO-HG Duo, Sony’s own proprietary media format. As an alternative for those who prefer more standardized media, Sony also supports three flavors of Secure Digital cards — standard SD, SDHC, and SDXC.

If you can tell me the relation between MOC max or peak amps values and the switched power done by the MAINS BT137 Triac I will be more than happy to hear….