AFCI circuit breakers and the problem of ‘nuisance tripping’ | 19mm Momentary Push Button

True enough; This hack goes back decades floor finishers who have large floor sanders use this hack to run their large sanders.

I am certainly not suggesting HVACR techs engage in performing work outside of their skills or licensures, but, in many cases, being able to identify the problem and making the repair are two different things.

Later while an engineering student I worked in a factory where they built video projection systems with a 30kV final anode voltage

I couldn’t agree more. I was hesitant to document it at all, but my thinking was that if someone was going to try it, better they have an outline of the traps they face.

The reason may be the cost of getting UL approval. You can buy off-the-shelf, UL approved, 12/24VDC power supplies. Once you are working with 12/24VDC most products don’t need further UL approvals. But — if everything is mains power you are going to have to pay for a new round of UL testing. That can be $10,000 or more.

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And another actually bigger reason for using DC instead of AC is when one wants x amount of mega watts of battery backed power, and converting that from DC to AC to DC again is rather inefficient, compared to just sending out the DC directly.

I’ve built a 24 V heated bed for my DIY (as I call it) Mendel 90 XXL printer (400 x 400 mm print area). I use a 24 V 400 W LED power source and – since I already had a 12 V RAMPS – put a 24->12 V DC-DC converter in line with the RAMPS and driving a 24 V heating mat (for cars) via a DC solid state relay. As long as it’s not too cold in the room I get up to 60°C which is helpful for PLA but of course not sufficient for ABS (but I don’t want to breathe these ABS fumes anyway)… I’d rather use a thick cable (in combination with an energy chain) than playing with mains voltage.

Yeah just what we need – another dopey ‘standard’. Putting stuff in right and using proper equipment is and has always been the solution.

The UMC equipment included with the Model 3 LR can supply up to 32 amps. That’ll charge at a bit over 30 miles an hour.

In the second week, I’m not even sure why I did it, I was working on a pinball machine and measured 240V between the chrome plates on the front of the 2 pinball machines to either side of the one I was working on. The electrician had “forgotten” to hook any of the earths for the whole building.

I am glad, that finally someone posts this, because this is also my information about dangers of electricity. I just have not been sure enough, if I had missed something. I also heard, that a DC accident can kill you hours later even if you are not burnt that heavily, because DC is able to cause electrolysis in your body which upsets the delicate balance of electrolytes in your blood and tissue.