The Expanse is being turned into an RPG | 25 Amp Circuit Breaker

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In the above, the first was the result of a fault condition making a sub part of the internal chassis float at HT voltage. The second was the result of a “friend” jokingly giving my shoulder a shove when I was working.

Opto-isolated TRIAC is fine and dandy, but there is no fuse, so if you overload it, you have a cooking TRIAC in your junction box …

No I don’t want one, because I have a computer museum and I don’t feel the need to instant-wipe all my floppy disks at the flip of a switch.

A mains isolation transformer. wdwd [GFDL], via Wikimedia CommonsAn isolation transformer isolates the mains supply from the earthing system. This does not change any of the risks inherent to the mains voltage or other high voltages in your device, but it does provide you with some level of protection should you accidentally provide a path to earth from a live component.

AC is safer than DC. You can let go of two AC terminals but not DC as DC keeps your muscles clenched. AC doesn’t.

Don’t blame the Chinese for this one! They are more than happy to sell us any quality we want. For example, you are probably reading this on a very well built, Chinese made, smart phone.

I don’t approve of that design. It lacks the third relay, which means that if you plug into two circuits on the same phase, you get 0 volts between the two hots, but both are still 120 volts away from ground. That means that the equipment doesn’t work, but it’s not safe to poke at. I prefer to insure that the 240 volt outlet is guaranteed to either be completely dead, or properly powered.

In the case of an opto-couple my ‘rule of thumb’ is for the min to be the distance between the pads on left and right rows of pins. ie nothing under the opto at all apart from the pads connecting the pins.

There are lots of big name professional meters that share the same ports for both. My Klein shares them.

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Before we dig in, know that the Amazon Smart Plug is designed for use with a 100-120 volt three prong system so it’s a North American product only.