Safe to use Wire Strands?

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Hello,I recently bought a 4-pack of smart light switches (Treatlife brand) off of ebay. Three of them look essentially unused but one (left in photo) looks like it was used and that someone had actually cut the wires to disconnect it.The ends of the wires look frayed – I’ve been doing some reading and I think this is because the wires are actually stranded (?) rather than solid.Do you know if it would be safe to use these wire-ends? Would the strands need to be soldered together? Or would it be OK to join these wire strands to a solid 14G copper wire using a wire nut?Thanks for your help!https://ift.tt/2KjIkAA via /r/DIY https://ift.tt/3oPLJ9v

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