Labeling Visibility and durability
The size, color, and contrast of all labels should be selected to ensure that
the identifiers are easily read. Labels should be visible during the installation of and normal maintenance of the infrastructure.
Labels should be resistant to the environmental conditions at the point of installation (such as moisture, heat, or ultraviolet light), and should have a design life equal to or greater than that of the labeled component.
To maximize legibility, all labels shall be printed or generated by a mechanical device, and shall not be written by hand.