Here’s a sure red flag the home contractor you’re considering is untrustworthy | 220v Contactor Relay

WIRE CONTACTOR: A wire and contactor displaying the 90°C rating on the wire and 75°C rating on the contactor (when properly torqued).

Looking at the datasheet for the Fotek SSR-25DA:https://cdn.sparkfun.com/datasheets/Components/General/SSR40DA.pdf

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.

Agreed…. I used to have a small plastic box in our workshop. It had two copper contacts on opposite surfaces, and a 9V battery, relay and tilt switch inside, and a Caution High Voltage sticker on it,

And now you know why companies react the way they do. It would be like someone going around deliberately ruining your reputation, and there’s little you could do about it.

The reason may be the cost of getting UL approval. You can buy off-the-shelf, UL approved, 12/24VDC power supplies. Once you are working with 12/24VDC most products don’t need further UL approvals. But — if everything is mains power you are going to have to pay for a new round of UL testing. That can be $10,000 or more.

Viking if your cord is getting hot, it’s being overloaded. Time to upgrade the circuit wiring and breaker. The cable doesn’t necessarily have to feel cold, but it shouldn’t feel noticeably warm to the touch either.

Not at all. One lumberjack pushes while the other pulls, and they’re both pushing and pulling against the ground. It’s fits perfectly.

​So if I am looking to make the magnet more powerful, other than supplying more current, could I wire the primary and secondary coils of the microwave transformer together in series to get more turns (being mindful to keep the direction the current flows the same in both coils)? My thoughts are that it would increase the resistance a bit from the added wire but that the magnet would have a lot more turns. Am I missing something or am I onto something? Thanks in advance!

While we are on this topic, in Canada a common building distribution voltage is 347/600V. Typically supplied to any medium sized business that requires more than 100kW and less than what would justify their own high voltage vault. For you electricians out there, a neat trick with 347/600V is that the current on a balanced 3 phase line nicely multiplies out to the power. So at 3 lines x 347V at 100A is 104kVA.

The contacts open because of the electromagnetic force (magnetism) generated in an iron core around which the relay’s coil is wrapped (Figure 3).

Phase-detect AF isn’t just faster, though, it’s much less noticeable in your videos. Because phase-detect AF actually measures the amount of mis-focus, it can command the lens to go directly to the correct focus setting, without "hunting" back and forth. By comparison, contrast-detect AF has to try different focus settings one after another, checking to see whether each amounted to better or worse focus than the one that preceded it. This can be quite distracting in the recorded video, as you can visibly see the focus shifting back and forth, even when the subject isn’t moving. Have a look at the video above left which shows pretty fast, sure-footed focus when the subject is changed. (See our Sony A33 Video page for more details and sample videos.)