Overcurrent exists when current exceeds the rating of equipment or the ampacity of a conductor. This can be due to an overload, short circuit, or ground fault [Art. 100]. Overcurrent devices protect conductors and equipment from overcurrent.
Outdoor conductors running to buildings aren't necessarily service conductors. They may be feeders or branch circuit conductors originating in another building. They may provide power for area lighting, outdoor equipment, or a separate structure.
Abstract: In this webinar, Mike will not only explain the current NEC requirements for GFCIs and AFCIs, but he'll explain how they operate, what causes their premature failure, and when they won't provide the safety protection you might have thought they would.