Completed a residential panel upgrade today. Replaced old 100A panel with Square D Homeline 200A, 40-space main breaker panel. Installed new 2/0 AWG copper service entrance cable. Upgraded grounding system with 6 AWG copper to new ground rods. Transferred and labeled all existing circuits. Added AFCI and GFCI breakers as required by code. Used Greenlee knockout set for new conduit entries. Secured panel with Tapcon concrete anchors. Torqued all connections with Klein Tools digital torque wrench. Performed voltage drop and continuity tests with Fluke multimeter. Coordinated with utility for meter swap. Completed upgrade in 10 hours, significantly improving home's electrical capacity and safety.