Label Information cont'd

DOE-STD-1044-93

control centers may be identified as MCC-1A and MCC-1B, but identifying them as

MCC-1A and MCC-1-1A may lead to confusion.

Abbreviations and acronyms used on labels should come from the facility's approved

list of abbreviations and acronyms, and should be commonly understood. Example

lists of system designator codes and component function codes are shown in Appendix

The following additional guidelines should be considered when developing labels for

specific components.

C Labels installed on electrical cabinets, panels, and equipment should indicate the

maximum voltage present.

C Labels placed outside doors to rooms should identify the major equipment items

contained within.

C Labels for electric motors and other electrical equipment should identify the power

supply (e.g., distribution panel, circuit breaker, etc.).

C Labels for pneumatic actuators should identify the respective isolation valves.

C Labels on piping should indicate the contents (or hazard) and the normal flow

direction. Piping containing radioactive fluids, toxic materials, or explosive gases

should be uniquely marked. (Appendix B identifies a standard method for labeling

piping using color codes to indicate the level of hazard.)

Color coding or shape coding can enhance the information presented on a label. For

example, facilities having multiple units or parallel trains of equipment may color code

labels using a distinctive color for each unit or equipment train, or they may code each

unit with a unique label shape (e.g., unit A labels are triangular, unit B labels are

rectangular, unit C labels are round). These practices have been shown to reduce

misidentification.

Color coding can also be used to identify functional groups of components, such as

components connected to the emergency power bus. When color coding is used, it

should be applied consistently and have only one meaning for each color or