The end of Instagram as we know it is here | 19mm Momentary Push Button

Ok let’s assume you have a coated PCB that that doesn’t promote condensation, now unless you’re immersing your PCB in Argon, the flash over voltage is a function of the air it’s in. Unfortunately this calculation has many variables such as impurities in the air like smog (which cause condensation), altitude (which dictates how much moisture the air can carry), distance between traces (of course) and several others.

First, some background. I am a design engineer working on safety of life critical hardware design and technology development for a military application. I noticed this project a while back, and I invested some thought into how I would design the system.

It is not enough to have the proper tools, you also have to use them in a safe way. The basic five rules go like this: 1. Disconnect from mains. 2. Secure against reconnection. 3. Verify that the system is really dead. 4. Perform earthing and short circuiting. 5. Provide protection from nearby live parts.

The melted solder was probably a secondary failure. When SSRs fail they often turn into heaters as his did and the heat from the base plate itself melted the solder before incinerating the plastic housing.

This. An isolation transformer can be a very useful thing, but also very dangerous. If you touch ONE end no problem, but if you touch both ends you will get cooked and the RCD will NOT trip. Or more directly: An isolation transformer does NOT allow you to switch off your brain! And NEVER connect a scope to such a transformer.

With the nation’s network of public electric vehicle charging facilities still relatively thin, most EV owners charge their rides at home. This can be as easy to accomplish as plugging the car into a wall outlet or as complex as having solar panels installed to replenish an EV’s battery.

For a more detailed explanation of how to match MOVs to applications, check out the “DC Application Varistor Design Guide.”

I would like to add that it’s not just electricity you need to worry about. There could be other energy sources present from things like air, springs, hydraulic, etc that could pose a safety risk when you remove the electricity.

I recently spent 2 days troubleshooting my main PC because it was shutting down under even normal load, let alone trying to mine cryptocurrency. (I mine on my daily-driver hardware, not investing in a dedicated rig)

PHEV is a lousy name for a class of cars, but what a good class they are. Most everything you say here could be said of my 2017 Ford C-Max Energi. It gets almost twice the MPG as my control car, a 2014 C-Max Hybrid. PHEV MPGs vary wildly according to your use patterns, but FWIW, mine is stuck on 65 cumulative MPG for its first 20,00 miles. At least half these days, I drove beyond the 20 mile EV range, and I drove over 100 miles on two or three days of the week, so I didn’t restrict my use to inflate my mileage.

▲ 西门子（siemens）PLC系统改造、PLC控制柜、施耐德（Schneider）PLC系统改造、罗克韦尔（Allen Bradley）PLC系统编程、电气动力柜半自动、全自动、专业程序编写、为您解决自动化控制难题。

And here I am telling the tale, one reason I snort whenever the momma’s kiddies post their “safety warning” comments on HaD.