For clarity and consistency, US utility companies rely on Uniform Color Codes developed by the American Public Works Association when mapping out subterranean utilities on surfaces above. On city streets today, you can see the spectrum of safety colors that have been formalized and revised over the decades by the American National Standards Institute: RED: electric power lines, cables, and conduit ORANGE: telecommunications, alarm and signal lines YELLOW: gaseous or combustive materials including natural gas, oil, petroleum, and steam GREEN: sewers and drain lines BLUE: potable water PURPLE:
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