Ditching Wire Nuts: Reliable Motor Connections Explained
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- Опубликовано: 1 авг 2024
- In the world of motor connections, following the rules is crucial. NFPA 79-2007 clause 13.5 9.2 is clear: "Electrical connections at motor terminal boxes shall be made with an identified method of connection. Twist-on wire connections shall not be used for this purpose." 📜
But what happens when motor terminal boxes keep getting smaller, making a solid connection a tight squeeze? 🤔 That's where Jeff comes in. Join us as he delves into split bolts, polaris lugs, ring terminals, and why wire nuts, once a go-to, now often spell failure in motor connections. Get ready for a crash course in motor connection reliability!" ⚡💡
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Great video Jeff! Thanks for putting this out here.
You bet!
thank you for the informative, clear presentation.
Glad it was helpful!
We use Polaris connectors. Haven't let us down yet
Awhile ago it was my turn to work the night shift at my plant and I had to work with an old guy. Keep in mind I’ve never talked or interacted with this guy before.. one night he told me to go make up a sump motor so I grabbed ring terminals, nuts, bolts and tape (varnished, 130, 88) and made my way to the motor to make up dog nuts. He came over and asked what I was doing, when I said I was going to put dog nuts on, he looked at me and said “you’re not an electrician, I’ve been doing this for years”. And then proceeded to make up the motor with wire nuts. 🙃
😖
So can you double lug motor leads on an insulated multi tap connection?
If referring to Polaris type connectors, yes as long as both wires are stranded. Usually with these types of connectors though, the motor conduit box is much too small to allow this type of connector.
@@MechanicalPros Yes, was referring to those (have some insulated multi tap connectors from Commercial Electric that are rated from #14 sol/str to #2/0 Str)
Any advice on how to do this though? Do the the two motor leads just sit on top of each other with the hex screw pressing on them in the connector? Or should the two strands be twisted then have the hex screw pressing on the twisted pair? Does it matter?
I will have the main power leads on the other side of the connector. So, L1 is in one multi connector with T1 and T6 on the other side of the connector. Then the second connector with L2 on one side and T2 and T4 tied on the other side. Last, the third connector with L3 one one side then T3 and T5 tied together to the other side. Don’t have to worry about the Wye start because the VFD is taking care of that.
My three main Leeds coming in for power are #6 AWG stranded (and the ground is #6). Then the six wire motor leads are #12 AWG stranded. 15 HP motor/200 volts.