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Can you create, and how safe it would be, isolation transformer with two transformers? so, secondary of first transformer connected to secondary of second (2:11:2) ? In my naive thinking head, it should work. i have few microwave transformers with modified secondary (about 20-30V output from 220V input), and was thinking of using two of them…

And it’s is a bad advice from ESD protection standpoint as well because nothing else, like your table where the new components are laying on, isn’t grounded so you’ve just created a potential well.

In the next part of this article we will venture inside some of the typical devices you will be working with to examine the individual hazards and techniques you might encounter.

Dust particles are often flammable, in high densities this means they’re explosive. https://en.wikipedia.org/wiki/Dust_explosion

I had a job testing these once, and I can confirm that standard failure mode for overcurrent is some kind of explosion. Usually it was a puff of flame and dust down the leg, but occasionally we’d get a TO220 blown in half

The list of absolutely required tools is missing the appliance tester. e.g. something like this http://www.fluke.com/fluke/m2en/Products/category.htm?Category=PAT or https://www.gossenmetrawatt.com/english/ugruppe/testingofelectrappliances.htm

You also have cables running from the power distribution system and over to the servers, if we halve the current in these lines, then we quarter the power dissipation in these cables. This is both true for the power cords, and for the internals in the power supply as well. At least for the “AC” side of it.

[Ron] does a nice job of explaining some basic concepts like using opto-isolators. However, the real value to the video is the easy way to interface to the existing controller. A little configuration into Home Automation rounds out the project.

However, there’s a reason we use 12V and 24V heated beds – they give us, at the very least, the illusion of safety. Therefore, [Makertum] is looking for a few comments from specialists and people who know what they’re doing.

I had a chance to spend a few days with a late prototype of the Sony A55 (equipped with production firmware version 1.0) prior to its release. (Note that the Sony A33 is so similar to the A55, that we’ve only made a few edits to this Field Test to make it work for the A33 review.) After running a couple thousand shots through it (it does have a very fast continuous mode) I found it to be a pretty compelling camera, combining remarkable shooting speed with a host of other capabilities that really set it apart from most of the market. It’s by no means perfect, but unquestionably expands the range of shooting capabilities open to consumers with average pocketbooks. Looking at just how much I found to comment on below underscores for me just how much Sony has done in the last few months. Read on for some of my thoughts on this new class of consumer SLR:

I think that one of the statements that stuck with me the most while doing LV operations training was from a doctor who said “If you are admitted to my hospital with electrical burns then I will do my utmost to make sure that your family get here before you die”

Not really clear but good point. I met an electrician who told me : ‘230VAC is not dangerous, I’m getting shocked a lot, it really hurts when its 400VAC. Oh by the way, I have to get an appointment for my heart !’