Impacts of DG on distribution network fault currents and protection. DG unit protection and Loss-of-Mains (LOM) protection. Failure of auto-reclosing. Sympathetic tripping of healthy MV feeder (unwanted trip). Blinding of MV feeder overcurrent protection (missing trip). Detection of islanding. Impacts on earth fault protection. Impact of generator type on fault currents. Disadvantages of ROCOF. Protection coordination. Electrical safety and DG.