Colour Coding

I assume it was you who asked the same question the other day.

Do you mean cable trays, or the cables in the trays?

Yes sir It was me.It is the cable trays and not the cables running over it.In advertantly i did not log in when question was posted secnd time and it was posted second time as i did not see the question in the thread.Hope I have clarified.I look forward to the answer.

Although colour coding of trays and conduits is sometimes used, for example to differentiate between mains power circuits and signal circuits, I've never come across any standard.

I'm not saying that there isn't one, and some large organizations almost certainly have one, but I don't know of any national standards.

Greetings.

The Bell System, AT&T, and most other telecommunications companies use this color coding.

5 tip colors

1. white (W)

2. red (R)

3. black (BK)

4. yellow (Y)

5. violet (V)

5 ring colors

1. blue (BL)

2. orange (O)

3. green (G)

4. brown (BR)

5. slate (gray) (S)

the first pair would be white with blue tracer (WBL) for the tip or number one wire or tray , blue with white tracer (BLW) for the ring or second wire or tray.

The color code for 25 pairs is:

1. white blue pair (WBL, BLW), 2. white orange pair (WO, OW), 3. white green pair (WG, GW), 4. white brown pair (WBR, BRW), 5. white slate pair (WS, SW),

6. red blue pair (RBL, BLR), 7. red orange pair (RO, OR), 8. red green pair (RG, GR), 9. red brown pair (RBR, BRR), 10. red slate pair (RS, SR),

11. black blue pair (BKBL, BLBK), 12. black orange pair (BKO, OBK), 13. black green pair, (BKG, GBK), 14. black brown pair (BKBR, BRBK), 15. black slate pair (BKS, SBK),

16. yellow blue pair (YBL, BLY), 17. yellow orange pair (YO, OY), 18. yellow green pair (YG, GY), 19. yellow brown pair (YBR, BRY), 20. yellow slate pair (YS, SY),

21. violet blue pair (VBL, BLV), 22. violet orange pair (VO, OV), 23. violet green pair (VG, GV), 24. violet brown pair (VBR, BRV), 25. violet slate pair (VS, SV).

You could use each pair combination or each individual wire as your numbering system and get 25 or 50 different trays.

To get more than 25 pairs you start with the first ring color as a binder

Blue White (White Blue to Violet Slate) pairs 1 to 25

Orange White (White Blue to Violet Slate) pairs 26 to 50

Green White (White to Violet Slate) pairs 51 to 75

... to

Slate Violet (White Blue to Violet Slate) pairs 600 to 625.

This will get you up to 625 different pairs or 1250 different wires.

OlympiaWA, thanks for your contribution - I'll probably copy'n'paste the info. for some time when I need it.

However, if you re-read posts #1 & #2, you'll observe that the question relates to cable tray colours, rather than cable or core colours.

Greetings.

Yes I read it. I have never seen a color code for trays in large telecommunications or large electrical installations and manufacturing plants.

To track cable trays in a large, multi-building complex it would work well to color code each one. There would be no confusion no matter which building, underground tunnel, tower, or computer room. There would only be one BLW RG conduit run or cable tray whether it contained power, phone, computer, cable tv, alarms, or control circuits.

I have used color codes in the USARMY, large telecommunications companies, computer systems, large manufacturing plants, military bases and posts, etc and these were all unnumbered or numbered. However there did exist confusion because as you can guess there were duplicate numbers.

Sooo I sent one that in lieu of none could fill the bill.

Thanks to both of you.Olympiawa ,info given by is useful.Well let's see any one else comes up with futher info.Thanks .

Nuclear plants, Cable Tray Color coding:

Channel A: Brown

Channel B: Green

Channel C: Blue

Channel D: Yellow

So long as it is internally consistent, and uniformly applied by all users, whatever standard you develop is apparently going to work, the point is, make it something that will work for you.