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Trapped key interlock switchgear door. An interlock is a feature that makes the state of two mechanisms or functions mutually dependent. It may consist of any electrical or mechanical devices, or systems. In most applications, an interlock is used to help prevent any damage to the machine or to the operator handling the machine.
Manufacturers of trapped-key interlock devices provide application guides showing typical interlock problems and recommended arrangements. Since the reliability and safety of the scheme critically depends on the possession of keys, duplicate keys must be carefully controlled to prevent any possibility of an unsafe operating sequence.
A Draeger ignition interlock device (red arrow) in a Scania bus. An ignition interlock device or breath alcohol ignition interlock device (IID or BAIID) is a breathalyzer for an individual's vehicle. It requires the driver to blow into a mouthpiece on the device before starting or continuing to operate the vehicle.
In functional safety a safety instrumented system (SIS) is an engineered set of hardware and software controls which provides a protection layer that shuts down a chemical, nuclear, electrical, or mechanical system, or part of it, if a hazardous condition is detected.
Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a diverging route, unless the corresponding points/switches had been changed first.
In addition to the low threshold, some of the other safety features include an in-cab emergency phone system and an "interlock door system" that won’t allow the elevator to move unless the doors ...