While advantages of DCMGs are considerable, of particular concern are the associated protection challenges, such as lack of phasor and frequency information, rapid fault current rise, breaking DC arc and certainly the lack of standards, guidelines and practical experience. DC microgrids, along with existing AC grids, are a future trend in energy distribution systems. At the same time, many related issues are still undefined and unsolved. In particular, uncertainty prevails in isolation requirements between AC grids and novel microgrids as well as in the grounding. Increased Energy Security: Microgrids can reduce dependence on fossil fuels and the traditional power grid, providing a more secure and stable energy supply. Increased Energy. Abstract—In this paper, we share the experiences of designing, installing, and commissioning grounding and ground fault protection systems for three different low-voltage and medium-voltage power systems. The first project is Electric Code (NEC) requirements, which may apply at DER sites. DCMGs have clear benefits such as high efficiency, high reliability, better compatibility with DC sources and loads, and simpler control, over its AC. teraction with the electrical system. However, the intrinsic structure of Current OS microgrids makes fully resilient to c ture to offer mor : battery rooms, solar panels arrays.