IEC 60073 mandates that coding principles be established early in the system design phase and remain consistent throughout a plant or process. It recommends using multiple "channels" of indication—such as combining color with shape or sound—to ensure clarity even if one sense is impaired (e.g., color blindness). 1. Visual Coding (Color and Time)
. Its primary goal is to increase the safety of personnel and equipment by standardizing how visual, acoustic, and tactile signals are used. iTeh Standards Summary of IEC 60073 Coding Principles iec 60073 pdf