On most switchgear ordered for 3 wire ungrounded systems there is usually some type of ground fault indication or alarming. Ungrounded systems are popular in continuous process applications where a circuit ground and the subsequent breaker trip causes more of a problem or expense than can be tolerated. Think about a plastic moulding machine, if a heater band fails to the machine frame (which happens) and the entire heating system goes down it can cause the damage to the entire machine as the plastic cools and hardens where it cannot be extracted. If this happens on an ungrounded system, the result is a corner grounded system (through the fault location). The machine continues operation until it can be shut down properly and a repair can be made.