This seller is falsely advertising the product I purchased (18AWG stranded). There is no rating on the cable itself. Any 600V wiring will show these ratings on the insulation. All of the wires were repeatedly reheated to 200Β°C except for the black wire which was also stamped 18AWG and appeared to be thicker than the others. I don't think other colors were even 18AWG. Bad product and false advertising.