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Why do we bother to monitor the connection to building ground on the DC bus, anyway? Most simply, the answer is protection of the cable and – even more important – the safety of personnel. If an AC line cable connects to ground, current flows through the protective devices and disconnects the power protecting the cable. If the DC cables short from the battery, often there is nothing preventing the batteries from providing full short-circuit current to the cabling. If one of the DC bus connections gets connected to the building ground, this sets the stage for a short if the other pole gets shorted to ground as well. Personnel who assume that the floating DC bus is not connected to ground can be electrocuted while working on the DC bus, if while handling the live connectors they ground themselves.