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the insulation should already be. But the connections are small sleeves. Strip the cables 3-4mm, twist them and push them into the sleeve, then solder. Then the cable insulation is very close to the terminal and does not need to be extra insulated.
But if you use ribbon cable, I would stabilize the cable ends after soldering with shrink tubing, so they do not break under mechanical stress.
In this respect, one should secure cables in the sea against mechanical stress.