No. The amount of heat given off is just going to be I^2R, and coiling the cable doesn't increase R. If you coil it so tightly that the heat can't get out, th

No. The amount of heat given off is just going to be I^2R, and coiling the cable doesn't increase R. If you coil it so tightly that the heat can't get out, that could be problematic, but it is not likely to be a problem with this coiling technique.