How do wire nuts work?

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The same nut fits on various size wires and holds it very tight!

In: Engineering

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They are designed to fit certain ranges of wire gauge and are typically color coded for what gauges they will fit. They are able to fit multiple gauges of wire because they are tapered. The metal threads inside grip the stripped wire and twist it together with the screwing action pulling the wire to the top where it gets smaller causing the wires to compress and hold.