In Bethesda, MD, I upgraded a 100-amp breaker panel to a 200-amp Square D breaker panel to accommodate higher electrical demand. The project involved disconnecting the old panel, running new service entry cables, and installing the upgraded panel. I transferred existing circuits to the new panel, labeled each breaker, and tested for proper voltage and load capacity. Additionally, I installed a surge protector within the panel for added protection. After final checks, the system was functioning reliably, providing the homeowner with increased electrical capacity for future needs.