RHH or RHW-2 or USE-2 conductors are used with conduit as specified in the National Electrical Code. When used as Type USE-2, conductors are suitable for use as underground service entrance conductors for direct burial at conductor temperatures not to exceed 90°C. When used as RHW-2 or USE-2, conductor temperatures shall not exceed 90°C in wet or dry locations. Voltage rating for RHW-2 or RHH or USE-2 conductors is 600 volts.
ASTM B800 and either B801 or B836 (SIW)
UL 44 for RHH or RHW-2
UL 854 for USE-2
Federal Specification A-A-59544
National Electrical Code, NFPA 70
Conductor | Insulation Thickness (MILS) | O.D. | Net Weight Per 1000’ (LBS) | Allowable Ampacities | |||
Size (AWG/KCMIL) | Strand Nos | 60°C | 75°C | 90°C | |||
6 | 7 | 60 | 283 | 44 | 40 | 50 | 60 |
4 | 7 | 60 | 333 | 64 | 55 | 65 | 75 |
2 | 6 | 60 | 388 | 93 | 75 | 90 | 100 |
1 | 18 | 80 | 459 | 124 | 85 | 100 | 115 |
1/0 | 18 | 80 | 496 | 149 | 100 | 120 | 135 |
2/0 | 18 | 80 | 536 | 180 | 115 | 135 | 150 |
3/0 | 18 | 80 | 583 | 218 | 130 | 155 | 175 |
4/0 | 18 | 80 | 635 | 266 | 150 | 180 | 205 |
250 | 22 | 95 | 710 | 322 | 170 | 205 | 230 |
300 | 35 | 95 | 760 | 377 | 190 | 230 | 255 |
350 | 35 | 95 | 806 | 431 | 210 | 250 | 280 |
400 | 35 | 95 | 849 | 484 | 225 | 270 | 305 |
500 | 35 | 95 | 926 | 590 | 260 | 310 | 350 |
600 | 58 | 110 | 1033 | 718 | 285 | 340 | 385 |
700 | 58 | 110 | 1100 | 829 | 310 | 375 | 420 |
750 | 58 | 110 | 1128 | 876 | 320 | 385 | 435 |
900 | 58 | 110 | 1222 | 1039 | 355 | 425 | 480 |
1000 | 58 | 110 | 1280 | 1138 | 375 | 445 | 500 |