STO, All Sizes
Heavy duty thermoplastic portable cord with an oil resistant jacket, for equipment leads and power supply cords. Portable cord types are listed in NEC Table 400.4. Their ampacity comes from Table 400.5(A)(1), not Table 310.16, and NEC 400.12 lists the uses cord is never allowed for, such as a substitute for fixed wiring.
We list 12 sizes of STO, from 18/2 to 10/4. All of them are priced online, from $0.3589/ft. Sold by the foot in whole feet from 25 ft, or on standard spools and coils. Up to 3 colors are listed per size. Each size has its own page with the price for every color and length, the date an order placed now ships, and the full specifications.
| Product | Size | Conductors | O.D. (in) | From $/ft |
|---|---|---|---|---|
| 18/2 STO Portable Cord | 18/2 | 2 | 0.35 | $0.7372 |
| 18/3 STO Portable Cord | 18/3 | 3 | 0.365 | $0.6790 |
| 18/4 STO Portable Cord | 18/4 | 4 | 0.395 | $0.9506 |
| 16/2 STO Portable Cord | 16/2 | 2 | 0.375 | $0.3589 |
| 16/3 STO Portable Cord, 600 V, Flexible | 16/3 | 3 | 0.395 | $0.8342 |
| 16/3 STO Portable Cord, White, 600 V, STOW, Flexible | 16/3 | 3 | 0.395 | $1.22 |
| 16/4 STO Portable Cord | 16/4 | 4 | 0.425 | $0.9312 |
| 14/3 STO Portable Cord | 14/3 | 3 | 0.535 | $1.41 |
| 14/4 STO Portable Cord | 14/4 | 4 | 0.575 | $1.42 |
| 12/3 STO Portable Cord, 600 V, Flexible | 12/3 | 3 | 0.6 | $2.40 |
| 12/3 STO Portable Cord, White, 600 V, STOW, Flexible | 12/3 | 3 | 0.6 | $1.94 |
| 12/4 STO Portable Cord | 12/4 | 4 | 0.65 | $2.03 |
| 10/3 STO Portable Cord, 600 V, Flexible | 10/3 | 3 | 0.655 | $2.67 |
| 10/3 STO Portable Cord, White, 600 V, STOW, Flexible | 10/3 | 3 | 0.655 | $3.17 |
| 10/4 STO Portable Cord, 600 V, Flexible | 10/4 | 4 | 0.705 | $1.82 |
| 10/4 STO Portable Cord, White, 600 V, STOW, Flexible | 10/4 | 4 | 0.711 | $3.80 |
Code references are to the NEC; check the edition your jurisdiction has adopted and any local amendments.