There may be times when you want to turn the lift off (e.g. to stop children playing with the lift or prevent unauthorised use). However, most lifts have emergency batteries on-board that are continually charged from the mains power, so simply switching the lift off can cause the batteries to fail. A far better solution is to fit the lift with a key switch which will isolate the lift buttons whilst leaving the lift energised (and the battery charger operational). This type of key switch is referred to as Key Isolation (or Keyswitch Isolation) as it simply isolates the lift controls.