Primary wire used in marine applications. Tin plated copper wire resists corrosion.
| UL®Marine Primary Wire | ||||||||
| Gauge | Black | Brown | Red | Orange | Yellow | Green | Blue | White |
| 16 ga | 251300 | 251301 | 251302 | 251303 | 251304 | 251305 | 251306 | 251309 |
| 14 ga | 251400 | 251401 | 251402 | 251403 | 251404 | 251405 | 251406 | 251409 |
| 12 ga | 251500 | 251501 | 251502 | 251503 | 251504 | 251505 | 251506 | 251509 |
| 10 ga | 251600 | 251601 | 251602 | 251603 | 251604 | 251605 | 251606 | 251609 |
