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A lot of info: The Sony A33′s EVF display conveys loads of info, but the Fn menu items (shown here at the left and right edge) require a low eyepoint or eye movement to take in. (Image courtesy Sony USA.)

In salt water – which approximates human flesh, the skin depth at 1 MHz is actually 25 cm which means your arm is a pretty good conductor through and through. The illusion of safety comes from the fact that the frequency is too high for the nerves to react, so you don’t get spasms or cramps and you don’t feel the heating that’s happening below the skin because there’s no heat-sensing nerves there and those at the current entry points have died already.

Most systems now do not distribute ground (earth) from the MV / LV substation. At the sub the neutral is connected to ground through a low value resistor (<1 ohm) to a nest of earth spikes. Live and neutral are then distributed. At the house Neutral will be connected to a suitable ground point and at that point the earth connection is split off from the neutral. This means that any difference in ground potential is slowly leaked through the big resistor at the substation and it is a big resistor, looks like an oil tank maybe 2 metres high and 1.5 metres across. It is also normal that if there is any equipment at a pole it will also have an earth nest for the neutral wire.

Read ‘Hack’ as in ” don’t really know what they’re doing” or ” shouldn’t really work but does anyway”

My busy season is when people are spending their tax returns and spring-cleaning, but I’m slower in the winter months leading up to that. Call me then, and I might be able to offer you a lower rate if I’m desperate for business.

Anyone that knows me really well, especially family members, is surprised/amazed that I’ve managed to be over 50 and still more or less bilaterally symmetrical, without too many visible scars.

This is the sort of topic where it wouldn’t be a great idea to be dismissive of textbooks and/or formal instruction. Often local power line crews will put on a safety demonstration at hamfests. No doubt they would do the same for the various builder/hacker/maker spaces

It may be just perception coloured by the general work environment, but a lot of the US regs seem driven by liability concerns. Too many lawyers.

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I neither would recommend the mains power approach (230V in Europe), the power of 120W is very well to be handled with 24V, even 36V is necessary. This 3D printers are in many cases still some kind of “hacker toy”, often are modifications or experiments done.

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It’s just sensible to avoid risks where you can. If it doesn’t cost much extra, why not bother? Tinkering with a 3D printer is likely to take concentration away from other areas. Low voltage is intrinsically safe from electrocution. Don’t make things dangerous for yourself.