Color Code Telecom/Electronic

Telephone Color Code

Please Note: 

In the Telephone binder groups there is no binder group corresponding to the 25th group Violet/Slate This group was omitted intentionally to facilitate ease of counting in 600 pair groups. 

By using these simple 10 colors a combination of 25 unique pairs can be realized. Where Each Tip Color is combined with each Ring Color. Each time the 25th pair is reached that group of 25 is wrapped with a plastic binder that follows the same color coding sequence as the pairs of wires until it reaches 600 pairs total. Then that group will be wrapped with a super binder color that follows the Tip Color sequence only. White, Red, Black, Yellow, Violet. 

                Mnemonics:  Blue  Orange    Green Brown  Slate

                                      Bell  Operators Give Better Service

                                      White  Red    Black          Yellow  Violet                   

                                      Why    Run    Backwards Young  Virginia


Fiber Optic cables

Fiber Optic cables utilize the same primary 10 colors for the first 10 fibers but then add two additional colors Rose and Aqua. 

 Unlike Telephone cables fiber color coding has only a single color on each tube for the first 12 fibers. The second 12 are marked with an additional Black tracer line on each fiber except for the Black fiber #20 which has a yellow tracer for visibility. 

General Cable Manufacturing  made a variation of the 600 pr. Super binder for cables larger than 2400 Pr. The 300 Pr. Super Binder They also included spare pairs in the event some were bad. 

ANSI 568B & 568A Color Codes

Balanced Twisted Pair Cabling

Horizontal Cabling balanced twisted pair is by far the most commonly ran cable at present time. While this page offers a brief description of how they are numbered there is not enough space to cover the topic in depth here. 

Some information to consider is the speed of the connection - this varies by cable type CAT3, CAT5, CAT5e, CAT6, CAT6a, CAT7, CAT8 each has their own limits on speed determined by not only conductor gauge, and conductor length, amount of twists, and also the type of conductor (solid or stranded) used as a patch cable to connect to the horizontal cable. 

NOTE: (Stranded conductor is never used as the horizontal portion of the circuit).

 Typically the horizontal cannot run more than 100 meters total, with the limit on the horizontal cabling at 295', and the patch cables 16'.  


Some articles to read on this subject would include: 

Ethernet Cabling, Structured Cabling, Balanced Twisted Pair, VOIP (Voice over Internet Protocol), Video Conferencing, Data Communications, just to name a few. 

Learn More

BICSI - Building Industry Consulting Service International 

Offers publications which provide a wealth of information to not only the new

apprentice technicians entering the field, but also to the seasoned professional, by constantly updating practices and methodology as it evolves BICSI standards help to insure your installation will your clients communications objectives. 

Find out more on BICSI

Underground Utility Color Coding

White -Proposed Excavation

Contractors are required to mark the pavement where they intend to dig or bore prior to the utility companies marking the existing facilities . Typically the utilities have two days to get their facility marked.

PINK - Temporary Survey Markers

Red - Electric

Electric power lines and cables, conduit and street lighting cables

Yellow - GAS

Gas. Oil, Steam, petroleum or gaseous materials.

Orange - Communications

Communications Cables or Fiber, alarm or signal cables or conduits

Blue - Potable Water

Water fit for human consumption

Green - Sewer and Drain Lines

Purple   - Reclaimed Water