The home electrical system began to see larger circuits which required more protection which was provided by fuses. These fuses have been used as the main electrical service protection being enclosed in a pull-out assembly that also served as a service or circuit disconnect. For several years, the modern switch style circuit breaker has been used to protect all the electrical circuits for a modern home. A Transformer changes the voltage level (or current level) on its input winding to another value on its output winding using a magnetic field. Both the primary and secondary coil windings are wrapped around a common soft iron core made of individual laminations to reduce eddy current and power losses. A grid connected system allows you to power your homes or small business. Currently requirement for connecting distributed generation system to electricity grid vary widely. Power providers have to be sure that your system include safety and power quality components. These components include switches to disconnect your system from the grid in the event of a power surge or power failure and power conditioning equipment to ensure that your power exactly matches the voltage and frequency of the electricity flowing the grid.