1. Engineer here. I made one of these for work, although I used the banana plugs with the retracting shroud. Significantly faster for recording all the readings I needed.

  2. Also an engineer, op would definitely not like the one I have, 60A 3phase Connecter on one end and spade connectors on the other end. Gotta test the motor in the shop somehow.

  3. I agree for a test / lab setup this thing comes in handy. But they could have at least used female banana plugs for this ...

  4. We did some weird and non-compliant stuff in the test lab I worked in, though I don’t recall AC into male banana plugs…

  5. I have one of these with spade connectors on it that I use on occasion. Granted I'm using it to test switching psus that come out of things like arcade machines. Who really knows what this is for with those banana Jack's on there.

  6. I don't know what they were trying to do, but if you know what you're doing this is probably a safe way to do it.

  7. We make these all the time. They are used for voltage / current injection when commissioning circuits in electrical drives/mccs, because you cannot turn power on to a circuit that is not verified. I can guarantee you that the technologists/engineers that use them know exactly what they are doing and that we have policies/procedures for their use.

  8. You obviously have to be careful, but there's a reason why this is a commercial product you can buy. This is as safe as just about anything in the "enough electricity to kill you" part of the world.

  9. My assumption, given my environment, is they had a buck or box and don’t bother to put the proper connector on it. It’s not exactly unsafe but I wouldn’t build it if asked.

  10. It is an engineers job to find solutions to problems. It is a perfectly acceptable solution if it will be used in a lab. I do not think it is a mass marketed product where safety rules and idiot proofing becomes much more important.

  11. I dont see anything inherently wrong with this. Sure there is a high potential for danger if used incorrectly but I imagine there is valid professional uses for such a cable. A bunsen burner can cause tons of damage if used improperly just like this cable.

  12. He should have used the banana sockets and not the plugs to make it safe. If a plug is needed for some reason, shielded ones with a plastic tip exist.

  13. It’s not any more dangerous than unplugged multimeter leads. The ones with unsheathed banana plugs.

  14. I'm a tech and at work we still use the old 90° expandeble unisolated banana plugs. They fit the EU sockets perfectly, no need for this one, lol.

  15. I've made up many 120VAC outlet cords for specific applications, test supplies, etc. It's really not unsafe as long as you're qualified and cautious.

  16. Cheater cables are very common. Its better to have a dedicated board and switch though..

  17. As a test lash up ? I’ll allow it. Hell, I have one similar with insulated banana clips on my bench.

  18. Whats the big deal. They could be using it for prototyping on a breadboard. Many have banana jacks for powering the rails.

  19. An engineer would also know to plug it into wall current only after the banana plugs are securely landed where needed. Looks good to me.

  20. Just plug in the Red... and the White... and the Green... and then over here we plug it into the wall an-FZZTBAM

  21. I should post some of the exposed 480V connectors we use in our lab. They're even scarier than the 100,000V supplies.

  22. Lol. Yikes. Yeah, some of the shit we get away with in R&D is scary. Had “one that walks on carpet” come down with 400v DC at 200a through a bunch of caps and wire bound ceramic resistors, unfused mind you, running through contactors with uninsulated lugs…. All mounted to a piece of plywood. His ask, “can you clean up the wiring?”

  23. Gonna be honest. I had one of these, but it had an AC/DC converter in the plug end. It broke one day and I had no way of telling, plugged it into the bread board as normal, and ended up running 120 volts of AC current up the ground leg of a raspberry pi.

  24. It's crazy to me that it would be designed in a way that would allow a non functioning rectifier to cause it to pass through full AC power.

  25. Technically, yes, you’re right, there’s safer ways to do this. It’s probably an inexperienced engineer that doesn’t know how to use McMaster-Carr to get connectors to do this right.

  26. Hey at least its better than my mother splitting a charging cord down the middle and stopping right before it fully cut and then proceded to charge two phones with it.

  27. If those banana Jack's are anything like the identical looking ones I have they're only rated at 40v lol

  28. I went to a hackerspace some time ago. There was a plug in the back that was on one end a shuko 16A plug.

  29. The biggest thing I see wrong with these bench test cables is that I always make the hot lead real short, so that if it gets yanked out while live, there is a good chance the ground will stay connected and if it doesn't they will be different lengths and less likely to accidentally touch.

  30. If somebody really does know what he is doing and is qualified this thing is fine. This thing is probably not even used on live outlets but with isolated transformers or four-quadrant ampflifiers for R&D purposes.

  31. It's called a suicide cord, and they are commonly used for electrical commissioning. Just don't fuck up.

  32. Both as an RF technician and an engineer, I've made a lot of test cables that OSHA would frown upon. Sometimes you have to do what you have to do.

  33. This is the sort of cable I make once for a random test and then lock in my bottom drawer so no one can use it and kill themselves.

  34. Well, good for her. Engineer A created one connector, Engineer B created another connector and this Engineer made the actual connection.

  35. I mean technically an engineer designed the machines that made everything in the photo, the camera that took the photo, and the hardware that runs the entire internet.

  36. I'd prefer to see a big red DANGER tag on the plug top end as a minimum, so you can't accidentally switch on the wrong outlet if it's next to other plugs on a strip.

  37. The reality is you need to do things like this. This is a tool, not an item that an untrained person can use without hurting themselves or others. Like most tools.

  38. I did the same but with iphone charger tho. It was so exciting when i was making it. But at the end there was a blast and phone died. Sad ending.

  39. Just as other comments state, there are practical reason to make these. I use these all the time. Im in the electrical testing field. Only proper personnel should use these.

  40. Lol still better than the cords I use which are basically just an AC power plug with the end cut off and with exposed copper wires at the end. I call them ‘suicide cords’.

  41. there are real technical uses for a contraption like that... if you pair it with a neutral to ground voltage detector or live to ground voltage analyser.

  42. /s well if the on-duty engineer made it, it must be safe. Engineers have so much time in college that they know what they're doing and would never hurt anyone with their designs! /s

  43. This is fine as long as it's used correctly. It should definitely be kept out of the hands of idiots, but based on the workmanship and the fact that they're an engineer, the person who made this (and will likely be the one using it) is no fool. As long as the three connectors are all plugged in before the wall plug is connected there's no problem here, and it's actually a very useful tool for prototyping. There are safer ways to do this of course, but realistically this should be fine and is cheaper than making a whole setup that serves the same purpose.

  44. I'll agree with some of the other sentiments here. This should definitely be locked up when not in use, the operator should have some decent PPE, and have a fundamental understanding of how this tool works before they're ever allowed to use it (which is probably a given, since they designed it.) Engineers often can't see the forest for the trees and this is probably one of those instances. They may have a specific need for this tool or something EXACTLY like it. We have to get to "yes" somehow.

  45. This sub is dying. Lmao. Driving your car to the post office to pick up your mothly subscription to golf magazine is more dangerous. Anyone who can do a 3 year olds jigsaw puzzle with stars, squares and triangles can use this safely. Obviously you don't plug it in and touch the ends to yourself, unless you have no idea how an electrical plug works.

  46. I have something similar to power up stuff for testing. But it's in my garage not a place where others can use it. And I use alligator clips.

  47. Pretty standard stuff when youre at the work bench chasing power problems on electronics, strictly in-shop

  48. Considering the kinds of cable i make here at work for various "i need this now" purposes i can see that one coming into existence.

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