Weatheryou’re connecting a solar electric system or a wind turbine to the gridyou will require a point of interconnection. The NEC (National ElectricCode) allows a grid tie inverters to be connected on the load side ofyour electrical service disconnecting means. Each grid tie invertermust be connected by its own dedicated circuit breaker or fuse.
Therewas a change in the 2008 NEC that allows the sum of the supply breakersto be 120% of the busbar ratings for both commercial and residentialsolar pv installations. This change in the NEC rules allows small solarpv systems to be interconnected without having to upgrade the servicepanel. Grid interconnection is quite complex, it’s not as easy assimply wiring your grid tie inverter into the service panel.
Thisinformation is good to know weather your the person conducting theinstallation or intend to hire a professional to grid tie your solarelectric system, you must make sure your installation is up to NECstandards.