Looking Mains Voltage In The Eye And Surviving | 19mm Momentary Push Button

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Why do the US still use 110v mains and 20A room circuit breakers? Those currents are dangerous, not the volts.

I prefer polycarbonate chassis with see-through lids. That facilitates continuous inspection while the device is in operation. I do agree that an output circuit breaker is not a bad idea. I’m comfortable with relying on the individual breakers on the input circuits combined with the two primary relays, which rather indirectly achieve the same purpose as the trip bar.

My post outlines the PME system. There are older systems that do run an earth / ground but they are being removed as and when they need attention. The US system is different but the number of countries using the US system is much less than the number of countries that use a similar system to the UK. I am UK based and UK trained.

Jamie Spinelli’s job as a case manager for Community Services Northwest takes her to parks, homeless shelters, the jail and…

UL rule of thumb for shock hazard: 1.5mm / 60mils distance between a hazardous live conductor and something touchable for single insulation level protection (double that for double insulation).

Chassis floats with just 2. My folks lived in the middle east before my dad retired and I visited them in 2013. You could feel 50hz on the refrigerator door handle. Touching their aluminum iMac gave a nastier jolt. I remember my dad telling me, “yeah, don’t touch that” after trying to plug in a USB stick.

With 12/24V, the resistance is low enough that it can be done using copper traces on PCB. P=V^2/R, so the resistance needed to be increase by 100 times for 12 to 120V. The traces gets a lot thinner and longer.

The US had the luxury of a relatively new infrastructure to deal with, just like our cars we built roads to fit the cars Europeans built cars to fit the roads, high RPM small displacement, VS low RPM large displacement in US. Power in Europe had to be retrofitted into 300 year old buildings, much easier with higher voltage-thinner wires, if you have ever been over there they also run their plumbing on the outside in old buildings because there is nowhere to put it inside the walls.

Pools have come a long way. It used to be you had a pump and if you were lucky it had a mechanical timer switch on it. That was it. Now you have digital controllers and spa jets and heaters. You can even get them that connect to your home automation system. If your pool isn’t new enough to do that already, you can get a range of add-on accessories. For a price. [Rob] paid $500 to get a remote for his pool. It wasn’t even WiFi, just a simple RF remote. In 3 years, the transmitter had burned out ($300 to replace) and he decided he had enough. For $20, [Rob] added MQTT control and monitoring to his pool using an ESP8266. You can see the video description of the project below.

I don’t know if the heat is high enough but mirror heating pads can be quite small and put under a sheet of glass would be quite effective.

Life gets in the way. No matter how much you plan, there will always be circumstances that, at the very least, interfere with that plan — if not throw it completely out the window.