I would think that a 20 amp industrial grade duplex recptacle from home depot would except a stranded #8 wire. You might have to put half the strands on one side of the screw the other half on the other side. If you look at the receptacle you will see what I mean. It is designed to capture the wire. Another option would be a crimp on spade connector #8. This will reduce the size for easy make up on any receptacle. I recommend industrial grade 20 amp recptacle bare minimum.
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