Here’s a sure red flag the home contractor you’re considering is untrustworthy | 19mm Momentary Push Button

Step 1:  To find the voltage rating of the MOV, allow for 20% headroom to account for voltage swell and power-supply tolerances: 24 V dc × 1.2 = 28.8 V dc. Given that no varistors have a voltage rating of exactly 28.8 V, check the datasheets for specifications for 31-V dc MOVs.

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No need, really. You just need a few mates with smartphones – just enable the wifi hotspot on each of them, place them roughly in a circle and put your coffee in the center. Make sure to dismantle the circle before you reach in for your cup though if you don’t want to get fried too – safety first!

The use of isolation transformers that is suggested here is very dangerous as the residual current detector of the installation won’t detect anything if one gets electrocuted from the secondary of the transformer. I’d rather not use an isolation transformer unless I really need.

And keep in mind that EVSEs are a continuous duty device. As such, you need to derate them from the circuit’s rating by 20%. So you should only use 12A on a 15A rated circuit. And you should only do that if you’re confident that there’s nothing else pulling significant current on EITHER circuit besides your EVSE.

The MOT cores are welded to the head, so they’re not coming loose without shearing. The sole purpose of the epoxy would be to keep the coils mounted to the cores (as well as keeping them free of damaging debris that would short the coils.) The only force the epoxy sees is from the eddy currents trying to push the coils away from the core (or vice-versa.) That energy then becomes the electromagnetic force that gets “transferred” to the ferrous cores – that are welded to the head. Since the force from the eddy current is fairly weak, there’s an low extremely low risk for such a failure. Not impossible, but it would take a catastrophic failure.

Well your musle will clench with AC as well. That’s why friend mine is still among the living. He was an oilfield pumper after n over night thunderstorm there was much equip down because of blown fuses and tripped motor over load protection devices my fried got an a hurry and got careless He reached int a motor control box and grab a fuse in each hand to pull them out. Because of other damage in the box they where energized. The jolt threw him on his ass because his hands clenched surround the fuses the act of throwing him back disconnect him from the electric power as the fuses pulled out out of their holders. I tech school one of the other student got bit by HV inside a TV and it threw his hand way. He wasn’t hurt by the electrical shock, but we kept an an eye him for a while because he looked like he could enter a state of physical shock.

The second was in an industrial setting, working on repairing a 480v-supplied welder in a hard-wired installation. Plant electrician assured me the circuit was locked & tagged out. I trusted him. Sprayed some contact cleaner on the mains relay to start, and took 480v up the spray and into the can (and my hands holding it). That was an unusual sensation.

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Heating is a function of power loss, which varies by the square of the voltage drop and inversely with the resistance. Current is a fallout of the voltage drop across the resistance. While typically stated as I*I*R losses, getting that “I” to be a big number with a low input voltage means that R has to also be low, which decreases power. Requiring a low R for the heating element magnifies the power losses in the rest of the circuit, where heat isn’t desired.

A bright idea. The Sony A33′s LCD screen sports a super-bright "Sunny Weather" mode. It loses some highlights, but makes the viewfinder remarkably usable in direct sunlight. Shot in direct afternoon sunlight, the sequence above gives you some idea of the effect.

Sorry.. gotta disagree here. I’m sure L1 charging can work for some people who don’t drive very much. But people who buy an EV thinking they are going to be able to do everything using the 120V EVSE are going to wind up ver dissatisfied with their EV owning experience. When you get buy a 240V unit from clipper creek for $300 these days, plus maybe a few hundred for electrical work, there is really no excuse not to get this done in most cases.