The most relevant standards for emergency stop applications are ISO 13850 and IEC 60204-1. ISO 13850 contains functional aspects and principles for design. IEC 60204-1 is about the safety of machinery and electrical equipment of machines.
• Emergency Stop Devices(1) Types
The following are typical types of emergency stop devices:
A pushbutton operated switch
A pull-cord operated switch
Electric contacts must have a direct opening mechanism.
Emergency stop devices must have a holding function that will mechanically hold in the stop position until the device is manually reset.
Actuators of an emergency stop device must be colored red and of a mushroom shape. The background immediately behind the actuator must be colored yellow.
Consideration must be given to the following items when a wire is used as an actuator.
The amount of deflection needed to generate the emergency stop signal
The maximum deflection possible
The minimum clearance between the wire and the nearest machine in the vicinity
The amount of force required for operation
The ease with which an operator can locate the device, by use of a marker flag or other method
The automatic generation of an emergency stop signal in the event that the wire breaks or becomes detached
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