Electronics > Projects, Designs, and Technical Stuff
"No-crimp" connector idea
Zero999:
--- Quote from: Simon on September 15, 2019, 04:41:41 pm ---It's about the voltage level and safety regulations on mains plugs. Plenty of connectors are rated for high voltages and disconnect everything at once.
--- End quote ---
But it's not safe to use one of those for the earth, as well as live conductors. Look at any properly mains electrical plug/socket and you'll find the earth connection is always designed to make first and break last.
Nominal Animal:
Where I live, outside temperatures can easily vary by about 60°C during the year. This means that screw terminals can fail due to thermal expansion, whereas spring-loaded terminals will keep contacts (due to spring action) regardless of temperature changes. Even indoors you can have 20°C temperature swings, especially if you leave your house at maintenance temperatures (around 10°C) for a winter month, due to a well-earned holiday somewhere warmer.
Because of this, I trust (locally sourced from reputable sources) Wago-style connectors way more than screw terminals. So do all the local electrichickens I've talked to.
ebastler:
--- Quote from: ElectronicSupersonic on September 15, 2019, 05:39:11 am ---Instead omega shaped contacts are used. Where wire is inserted in to an "eyelet" and affixed in place by the spring action of the contact. Thus special tools are not needed.
--- End quote ---
How much spring travel do you expect those "omega contacts" to have? Your renderings look like the inner diameter of the eyelet which receives the wire is pretty much fixed. How would these contacts clamp wires of slightly varying diameter? (Or worse, multi-stranded wire twisted in slightly different ways, and with some room for the strands to move relative to each other?)
Simon:
--- Quote from: Zero999 on September 15, 2019, 07:32:26 pm ---
--- Quote from: Simon on September 15, 2019, 04:41:41 pm ---It's about the voltage level and safety regulations on mains plugs. Plenty of connectors are rated for high voltages and disconnect everything at once.
--- End quote ---
But it's not safe to use one of those for the earth, as well as live conductors. Look at any properly mains electrical plug/socket and you'll find the earth connection is always designed to make first and break last.
--- End quote ---
They are not meant for such a use. They are equipment interconnection connectors that will only be mated or unmated when the equipment is powered off.
tooki:
--- Quote from: tautech on September 15, 2019, 08:15:44 am ---There's a simple trick for fine stranded cables and insertion into crimp lugs, ferrules and the like.
Pull off ~6"or more of insulation tape and spin it loosely into a soft round rope shape and bind the strands not too firmly together starting from the insulation sheath nearly to the tip of the strands and then back towards the insulation a couple of turns. Keep finished end taught.
Insert exposed strand tip into lug and press not too firmly home.
The tape rope slides down the strands and will bunch up at the end of the sheath between it and the lug.
Unwrap tape rope then press cable fully home..... done !
Done properly you'll never miss inserting even a single strand.
This tape rope can be used again and again.
Thanks to my sparky mate Wayne for that one. :)
--- End quote ---
Could you maybe make a video of this? I'm having trouble visualizing what you mean, but it sounds useful!
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