US 4 Color Code:
| Conductor #: | Base color - 1st ring - 2nd ring: |
|---|---|
| 1 | black |
| 2 | brown |
| 3 | red |
| 4 | orange |
| 5 | yellow |
| 6 | green |
| 7 | blue |
| 8 | violet |
| 9 | gray |
| 10 | white |
| 11 | white-black |
| 12 | white-brown |
| 13 | white-red |
| 14 | white-orange |
| 15 | white-yellow |
| 16 | white-green |
| 17 | white-blue |
| 18 | white-violet |
| 19 | white-gray |
| 20 | white-black-brown |
| 21 | white-black-red |
| 22 | white-black-orange |
| 23 | white-black-yellow |
| 24 | white-black-green |
| 25 | white-black-blue |
| 26 | white-black-violet |
| 27 | white-black-gray |
| 28 | white-brown-red |
| 29 | white-brown-orange |
| 30 | white-brown-yellow |
| 31 | white-brown-green |
| 32 | white-brown-blue |
| 33 | white-brown-violet |
| 34 | white-brown-gray |
| 35 | white-red-orange |
| 36 | white-red-yellow |
| 37 | white-red-green |
| 38 | white-red-blue |
| 39 | white-red-violet |
| 40 | white-red-gray |
| 41 | white-orange-yellow |
| 42 | white-orange-green |
| 43 | white-orange-blue |
| 44 | white-orange-violet |
| 45 | white-orange-gray |
| 46 | white-yellow-green |
| 47 | white-yellow-blue |
| 48 | white-yellow-violet |
| 49 | white-yellow-gray |
| 50 | white-green-blue |
| 51 | white-green-violet |
| 52 | white-green-gray |
| 53 | white-blue-violet |
| 54 | white-blue-gray |
| 55 | white-violet-gray |