IEC 60073 is the international standard that sets the rules for how we use colors, shapes, sounds, and touch to communicate with machines
When she presented her sketches at the next lab meeting, the engineers laughed at first. Then they fell silent. Her simple drawings prompted them to speak of safety in human terms instead of footnotes. They redesigned an instruction sheet, changing the layout and adding clearer visual cues. The new manual reduced accidental mistakes in the prototype rig by a small but meaningful amount.
| Color | Meaning for Indicators (Lights) | Meaning for Actuators (Buttons) | Typical Application | |-------|--------------------------------|--------------------------------|---------------------| | Red | Danger, emergency, fault | Stop, emergency stop | E-stop button, overheat alarm | | Yellow/Amber | Warning, abnormal, attention | Restart or intervene | Temperature warning light | | Green | Safe, ready, normal operation | Start, enable | Machine start button | | Blue | Mandatory action (operator needed) | Reset | Reset after fault | | White | Neutral or general info | Any function (if no conflict) | General status lamp | | Black/Grey | Not used for indicators | Start/stop (if red not used) | Auxiliary controls | iec 60073 pdf
The IEC 60073 standard, titled "Basic and safety principles for man-machine interface, marking and identification – Coding principles for indicators and actuators," establishes the international rules for assigning meanings to visual, acoustic, and tactile signals.
IEC: International Electrotechnical Commission - ANSI Webstore IEC 60073 is the international standard that sets
The standard aligns closely with the principles of IEC 60204-1 (safety of machinery) and ISO 13850 (emergency stop functions). By following IEC 60073, manufacturers reduce the risk of human error. Consider these real-world applications:
Temporal changes (flashing) are used to attract urgent attention. IEC 60073 specifies two flashing speeds: Normal (High Priority): 84–168 flashes per minute. Slow (Low Priority): 24–48 flashes per minute. 2. Acoustic Coding They redesigned an instruction sheet, changing the layout
At 2:13 a.m., while reading the section on signal polarity, Mara dozed and dreamed. In the dream the symbols stood up from the page and formed a city — the City of Conventions — where every lane, lamp, and gate corresponded to a clause: the danger sign sat on a tall pillar, the protective conductor formed a backbone of bronze, and the isolation symbol was a moat around the central library.
The standard defines specific methods for coding information so that users can react immediately and correctly to signals. 1. Visual Coding (Colors and States)
