During the refit of a megayacht built in Germany, unexpectedly high leakage currents were detected at the central earthing point, the cause of which could not be eliminated. Safety must come first, and technical failure must be ruled out, especially in an environment developed and created for all-round comfort at sea and where numerous technical innovations are designed to create luxury and inspire the guests on board. Imagine that you have chartered a megayacht to do everything you have always dreamed of. The plan: You and your friends start the morning with a dip in the pool, then after a light breakfast in the elegant dining area on the aft deck, you launch the jet skis in the sunshine to play on the waves and later look forward to taking a trip over the gently rolling hills of the island in front of you on the Harleys waiting on board. But then your plan suddenly unravels: When adjusting the counter-current system of the pool on the upper deck, the personal trainer suffers an electric shock, is rescued unconscious from the pool and must be flown by helicopter to the nearest hospital. Cause of accident: Electric shock from a non-tripped residual current device (RCD). As far as we know, something this bad has never happened before. And so that it never does, the first refit of an over 100 meter megayacht built in Germany focused on residual current monitoring and load monitoring. Luxury should be safe too Residual current monitoring with the RCMA423 residual current monitor 2