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splicing stranded flexible wire? Bad idea unless you know what you're doing. Best use a barrel or other splice connector and tape well.If you have several lampcords to run through the wall, get two J-boxes (junction boxes), one for each side of the wall. Use some cable glands/dome fittings for the flexible lamp cords. Between both J-boxes install a length of EMT pipe and some plastic bushings, and run cables through the EMT pipe, you can splice if you have to. The J-boxes will have 1/2" knockouts or drill your own for the dome fittings.
https://www.zoro.com/burndy-mechanical-conn-splice-10-to-14-awg-ams0/i/G4689763/