[Andy A.]

While labeling requirements are not specifically called out in either the rules or inspection checklist, an inspector is tasked with verifying that wiring is appropriately sized. The most foolproof way to demonstrate that a wire is correctly sized is to have it labeled as such by the manufacturer. There is enough variation in insulation thickness that you really can't/shouldn't rely on outward appearance. An experienced inspector can probably size wire that way, and they are given examples as part of the training, but the burden of proof is ultimately upon the team should any questions arise.

Some wire may not have a size listed on it from the manufacturer*. If that's the case for your robot, I'd strongly recommend that you bring the spool that wire came off of, which should have the size printed on it, with you to competition. An inspector can compare the wire on the spool with the wire on the 'bot and that'll satisfy 9 out of 10 inspector concerns.

Andy A.

*Incidentally I'm not sure if the lack of labeling signifies a lack of some certification or class rating. I'd be curious to hear from any anyone who knows the ins and outs of wire sizing and classifications about that.