What Most Techs Get Wrong About Wire Sizing | 2017-09-18 | 220v Contactor Relay

But yes, 1A is the absolute maximum, peak value for the MOC3041M for a brief amount of time. Even the MOC3041’s 8A maximum, temporary rating is unsuitable as a peak for a typical 15A US mains.

So the 12 / 24 V designs aren’t an illusion of safety, they are safer if you accidentally short yourself to them

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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.

I work with high voltage all day everyday except for weekends, and then I’m probably doing some wiring or something at my house. 480VAC is on the low end of the voltage scale for what I do. The biggest and most important safety tip is: “Know thy equipment.”. That means knowing where the 480VAC is coming in, everything it powers, where that voltage gets stepped up to thousands of volts, what chassis and assemblies are floating at high voltage, at what point of the turn on sequence they are at high voltage, knowing what to use a chicken stick on when things are powered down (i.e. the high voltage bits – BUT NEVER AC MAINS!!!). I’ve seen the ends of chicken sticks where the unknowing tried to short 480VAC to ground… thank el diablo for fast acting circuit breakers… If you do not know what the hell you are doing or think suiting up in some silly bomb suit and silly gloves that are going to get you killed faster with than without, you need to stay the hell away from anything over 28 volts…. You cannot troubleshoot everything with LOTO, you sure as hell can’t troubleshoot with big stupid gloves and a bomb suit on. Those things were invented by desk jockeys who have never had to work on anything themselves in their lives. Great for theory, terrible for getting shit done. Knowledge is the only thing that will keep you safe. Stupidity and trusting others to keep you safe will kill you.

The mechanisms that take place if a big shock happens (big = high current, not voltage) is that it cooks the muscle so even though you sort of feel OK within a few hours the blood coagulates, you start to ache like you would not believe and you suffer a horrible painful death.

Evil Triacs, should be banned by Law anywhere in the World. How is looking a dimmer with Relays? I will love to see a picture. Or an evening filmed youtube video with it, the contact sparks are a free added effect, nice one

The Residual Current Circuit Breaker is a tad expensive, and is probably overkill for most hobbyists. A Ground Fault Circuit Interrupter outlet, (GFCI), is cheaper to buy, cheaper to have installed, and a *knowledgeable* do-it-yourselfer can install his or her own. If you are knowledgeable about electrical wiring and codes, but don’t want to change an outlet in your house, you can buy a GFCI outlet and some regular outlets and make your own ground-fault-protected power bar, as a correctly wired GFCI outlet can protect additional regular (cheap) outlets as well. Alternatively, I’ve also seen GFCI units that plug in overtop of regular outlets and add protection to them.

1) the frequency (50-60 Hz) tends to make muscles spasm repeatedly (DC spasms and stays there) 2) the frequency can interfere with cardiac electrochemical signalling (your heart goes into fibrillation) 3) the current can pass through capacitance (shielding) and via inductance 4) the current can pass through ground return and other single-wire, open circuit States

All of the wire in the high current path is 10 gauge wire that was cut from SOOW cable, so it is, indeed, rated for 600V. In addition, it has 105 degree insulation, which means that it’s actually good for more than 30A. But it’s largely moot since the NEMA 5-15 plugs would only ever be found on 20A circuits (and even then, they likely wouldn’t be dedicated).

We were pretty close to that 40% rule when our controllers started to fail, which is probably why they only started failing after our customers had use the controllers a few times. We were pushing 22 Amps through 40 Amp rated parts. In other words, using a component at half its rating still won’t cover for substandard parts! Our solution was to find a part that was manufactured to spec and also use the component at half its rating and we’ve not had a verified SSR related failure since.

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