A friend of mine used to work for AT&T in large CO in the 80s and he said there were people in the company who had sole the job of inspecting their wraps. I don't remember the exact number but each one had to wrap someting like 8 1/2 wraps or it would be rejected and they had to do it all over again. I don't remember the exact number but the 1/2 stuck in my mind.
reply to battleop Depends on the style of wrap - a "modified" wrap is 1/2 wrap of insulated wire, and 7 of bare copper... A standard wrap is just 7 of bare, the insulation just touches the pin, but doesn't wrap around it...