Could A Fire Have Caused The Loss Of MH370? | 220v Contactor Relay

A big oversight is that outlets are frequently wired backwards with the live and neutral switched. The outlets could be tested first but that kind of defeats the purpose of this thing. Also most houses will have all the outlets in one room be on one branch.

Waterjet, who seemingly has no concept of how a basic opto-isolated diac-driven triac circuit works, chimes in with useless blabber about insufficient current ratings of the *optoisolator* — seriously? If you’re going to throw stones at someone, perhaps you could verify that you have somewhat of a clue of what you’re talking about?

That’s also a mistake in the article, because the house ground doesn’t exactly ground the house. It just grounds the appliances. You can still have thousands of volts between a table and the wall socket ground in a thunderstorm. Even on a normal day, you have about 100 Volts per meter in potential difference just from atmospheric charges, which is why it’s a bad idea to ground the computer you’re working on unless you also ground the table, the chair, the floor and yourself.

Interesting idea. You don’t need a 3D printer for this though. Conductive strips or simple wire should work fine.

It happens to the best of us. We power up our project and immediately run into issues. Be it spotty communication or microcontroller reset or any number of bugs that have us mystified and picking though our code… only to find that it’s a power supply issue. Anyone who has tried doing Raspberry Pi stuff and depended on the USB power from their PC has certainly been bit by this.

> and some apartments are fed with 208V 3-phase, which provide three phases of 120V to neutral, or 208V phase-to-phase.

GFCI breakers aren’t usually used because they aren’t accessible to normal operators like a outlet mounted one would be.

I suppose the other point of note is that compared to 220/230/240 Euro voltages, residential 240 is not 240 to ground. The only things that have such high voltages to ground are either corner-grounded 240 deltas (which are exceedingly rare) and 480/277Y systems (which admittedly I do a lot of work with). I also really like how in the US we have such an extensive system of completely non-interchangeable, unique connectors for all the different voltage and phase combinations that one might find (thanks, Harvey Hubbell!)

http://www.aliexpress.com/store/product/110v-220v-Silicone-Rubber-Heater-Bed-600MM-x-600MM-24-X24-For-3D-Printer-With-100k/709519_1847472742.html

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Haha the big experts get all positive votes, but yours truly with a Master Electrician’s License gets all negatives. Hey, Believe what you want.

Interestingly, I didn’t notice the unusual size of Sony A33′s viewfinder display when I first picked up the camera, but I became acutely aware of its loss when I switched back to a conventional sub-frame DSLR after having shot with the Sony A55 and A33 for a day or so. The conventional DSLR suddenly felt I was looking down a tunnel, and I also found myself greatly missing the richness of the A33′s viewfinder information overlays. The excellent image quality of the Sony A33′s EVF did a lot to win me over to the idea of EVFs on interchangeable-lens cameras, but it was the combination of image size and informational richness that really put me over the top. Because it could appear right there in the viewfinder, rather than on the rear-panel LCD, I was surprised to see how much I came to rely on the electronic level display for keeping my landscape shots straight when there was no obvious horizon line.