Outdoor electric panel boxes often have jammed locks and warped lids preventing easy access. First, ensure power is off for safety. Apply penetrating oil to loosen moving parts. Because the box contains high-voltage, high-amperage components that can be lethal, a homeowner must understand that this guide is strictly for safely opening the exterior cover and the protective dead front, not for performing any wiring or internal component work. A qualified, licensed. However, with a few simple steps, you can open an outdoor electrical box safely and efficiently. The breaker serving the circuit is a GFCI breaker. The good news is that most issues are easy to troubleshoot, especially if you follow the steps below.