WAGO Union Nuts are described as accepting 12-gauge stranded wire. I've tried inserting 12 gauge stranded wire several times to no avail. Even when fresh, straight-cut and stripped, there is usually either twisting of the strands or bending of the wire due to over-diameter insulation, or both. I've only dabbled in 12 gauge since I got them about a week ago (that's why I bought them), but I'm sure they'll work fine in 14 gauge or less. I'm new to them so it may take a little experimentation to find an arrangement that works.
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