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| are wire nuts vibration resistant? |
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| rhb:
Buchanan crimp connectors certainly won't come loose. http://www.idealindustries.ca/products/wire_termination/terminals_crimps/crimp_connector_splice_cap.php There are a number of options for insulation including insulated sleeves and separate covers. And there's always heatshrink if space is tight. I've found wire nuts in a lot of tools. I wouldn't use one on a vehicle, but I've never seen one fail in a power tool. |
| KL27x:
--- Quote ---In my mind a crimp is deformed mechanically so much that the effect is small. With a wire nut I am not sure, it seems mechanically different. Can it 'walk' off? --- End quote --- If the proper nut is used for the wire size, the wire should be deformed and squished together. The threading will push the copper into the nut, rather than a crimper squeezing the crimp around the wire. The method of generating the pressure is different, but the end result is pretty similar. I don't know why a nut should ever fail in a house. I think the main concern in a circular saw is the vibration. "Pullout force," shouldn't be a factor unless you mean internally by vibration. The maze/gland has the job of preventing a pulling force on any connections. |
| drussell:
--- Quote from: Karlo_Moharic on November 04, 2018, 08:21:23 pm ---Much safer to use something like this : --- End quote --- Oh my... Good GOD no... Those things are terrible! :scared: That kind of horrible thing is never allowed in any kind of permanent wiring installation anywhere here in NA, at least not that I'm aware of. I certainly would never use those anywhere, even inside some solid steel kitchen appliance or industrial apparatus that couldn't possibly burst into flames. |
| james_s:
--- Quote from: CatalinaWOW on November 04, 2018, 11:53:47 pm --- All connectors fail occasionally. Either due to improper installation, manufacturing defect, or whatever. What are the failure rates? Anecdotal information is not data. Thermal expansion and contraction is an issue for any connector design. Some designs have an explicit and fairly free floating spring to deal with this. Others have a more implicit spring action. Screw terminals and wire nuts are in this class. Crimp joints have little if any. All of the connector types mentioned in this thread form a gas tight seal. Some with more area than others. Some with some control over the pressure exerted. There are reasons to hypothesize failure for all of these, but I don't have any information on the actual fielded failure rates. There is also reason to expect those failure rates to vary regionally due to climate and construction differences. I would really like to see engineering data rather than prejudice. I am uncomfortable with some aspects of European wiring, but readily admit that my discomfort is driven more by unfamiliarity than facts. --- End quote --- The European style screw terminal blocks are quite good, I've used them in quite a few projects where the convenience is nice. They are not as secure or reliable as a good wire nut though, I've had the screws work loose, wires can sometimes pull out, but if being able to connect and disconnect easily is important they are superior for that task. I'll still stick by my assertion though that anyone who says wire nuts are not reliable is either not installing them right or is full of shit because they're simply not any more problematic than anything else used for that purpose around the world. There are billions of them in service and failures are exceptionally rare, only time I've ever seen it is when box used outside has filled with water. If that's not the case then I too want to see data. Now one very seriously flawed part of the NA electrical system is the push-in backwire terminals that are all too common on residential grade junk. Those ought to be outlawed, the European screw terminals are far superior to those. |
| rhb:
--- Quote from: drussell on November 05, 2018, 05:19:27 am --- --- Quote from: Karlo_Moharic on November 04, 2018, 08:21:23 pm ---Much safer to use something like this : --- End quote --- Oh my... Good GOD no... Those things are terrible! :scared: That kind of horrible thing is never allowed in any kind of permanent wiring installation anywhere here in NA, at least not that I'm aware of. I certainly would never use those anywhere, even inside some solid steel kitchen appliance or industrial apparatus that couldn't possibly burst into flames. --- End quote --- Actually, most US wall receptacles currently being sold have a connection like that. It's packaged differently, but the principle is the same. It was up to 12 AWG, but now they only allow that connection for 14 AWG. |
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