I think UL covered this in an article in the IAEI News or possibly in their own newsletter sent to inspectors. As the others have stated, minor damage to the jacket is no big deal under most circumstances. However, the nylon jacket is part of the gasoline & oil resistance (if the wire is marked as such) and if the outer jacket has suffered much damage it should be replaced.

Tom

Few things are harder to put up with than the annoyance of a good example.