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Electrical connections are just that: they allow electricity to go through. Subjecting a cable splice to tensions or vibrations is a recipe for disaster. Regardless of whether a splice uses twisted wires, soldered wires, crimped terminals, etc., a mechanical device should always protect the splice from vibrations and tensions. Soldered splices have less losses, but they become brittle. The same happens with soldered terminals. Crimped terminals are the gold standard in most applications, even at high currents. I remember using crimping devices powered by hydraulic pumps or even shotgun shells to drive the piston into the terminal or splicing tube. Even then, there was always some kind of clamp or bracing device to transfer all mechanical loads away from the terminal or splice. Nowadays, we have plenty of splicing accessories that allow us to make efficient and safe splices.
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