What Most Techs Get Wrong About Wire Sizing | 2017-09-18 | Circuit Breaker Parts

I don’t know where do you see low voltage traces close to mains voltage. Trace from R8 to the opto is 2.64. How far do you think it should be to meet your standards? Conformal coating is telling you anything?

Bryan Orr is an HVAC and electrical contractor in Orlando, Florida. He is the founder of HVACRSchool.com and the HVAC School Podcast. He has been involved in technician training for 15 years. 

I will not put all the money on the bet, but this one might be indeed one of the solutions: http://www.mouser.com/ds/2/328/lnk302_304-306-179954.pdf if you want something “all-in-one”. I prefer a separate external PSU for many reasons, including circuit separation and protection. You can find 5V and 3.3V SMPS DIN rail mouting ones for decent prices.

Remarkably, this big battery doesn’t affect the utility of this not-a-crossover. Interior dimensions, including the 100.9 cubic foot total passenger volume and 19.4 cubes of luggage capacity, matches that of the standard Niro. That picture of the cargo hold shows a small bag that carries the charging cable, but it’s removable and fastens anywhere on the floor with hook-and-loop fasteners.

Certainly not as dull as a Golf. The estate, sorry Sports Tourer, with more rear space might even tempt me.

It’s a 750W pump. Since it is running on 220V, steady current would be ~3.5A, so inrush current could be as high as 20A, according to some sites I’ve just found. Doesn’t sound awesome.

They’ve lifted 200kg so far, and it looks like a pretty cool addition to a shop already packed with other builds, like their MOT spot welder and a propane tank sandblaster.

A 25A relay seems perfect for a 22A load. If the relay is really built for 25A and not only marked as one. What use had a maximum rating when you could never really use it?

Tomczyk is a professor of HVACR at Ferris State University, Big Rapids, MI, and the author of Troubleshooting and Servicing Modern Air Conditioning & Refrigeration Systems, published by ESCO Press. To order, call 800-726-9696. Tomczyk can be reached at [email protected] (e-mail).

I came here to post those two points! The corollaries to 1) are that should something go wrong, you have a chance if there is someone else there who knows CPR. I like mandatory CPR training for lab workers because of this. AEDs are good too. Rules against playing with things that can shock you while working alone are also good, but much harder to follow–I’ve spent decades working alone in research labs. CPR fails way more often than not, but electrical shocks are an important exception to that rule. And you almost got the extra credit for correctly spelling arrhythmia.

I would also use a solid state relay. And I would think about gluing the glass plate with high temp silicone to the PCB. This vastly improves thermal contact and so heat transfer which reduces peak temp and thermal lag in the control loop. Also it prevents exposed live wires even in case the glass breaks.

Yup, switched off but still plugged in, that way the case is still earthed. Assuming a sensible 3-pin plug, or whatever the hell they do in places with just 2.