

TYPE TW/THW/THW-2
Scope
This specification covers type TW/THW/THW-2 cable with soft annealed copper
solid or stranded conductor and PVC insulation, conforming to Standard 83 of Underwriters Laboratories, Inc. They meet
the requirements of the VW-1 flame test and oil resistant. UL file No. E210924.
Application
Type TW/THW/THW-2 are intended for general purpose
applications utilized in conduit or other raceways for services, feeders and
branch-circuit wiring as specified in the National Electric Code (NEC). TW is
rated at a conductor temperature of 60℃ dry or wet, THW is rated at a conductor temperature of
75℃ dry or wet, THW-2
is rated at a conductor temperature of 90℃ dry or wet. They are permitted for 600V application.
Construction
Conductors: Soft annealed copper, bare or tinned.
Sizes 14AWG-2000kcmil: Solid or stranded.
Insulation: Flame retardant PVC. Thickness: per UL83.
Information on the
cable: AWG or kcmil size, type letters, rated
voltage, the name of the manufacturer, UL file number, characteristic, manufacture
date, FEET.
Table 1
Type THW-2 Cable Data
Size AWG | Strands No./OD. (mm) | PVC Insulation Average Thickness (mm) | Approx. O.D. (mm) | Max.DC Resistance (20℃, Ω/km) (Bare Copper) | Max.DC Resistance (20℃, Ω/km) (Tinned Copper) |
14 | 41/0.254 | 0.76 | 3.38 | 8.61 | 9.25 |
12 | 65/0.254 | 0.76 | 3.97 | 5.43 | 5.82 |
10 | 104/0.254 | 0.76 | 4.65 | 3.41 | 3.66 |
8 | 168/0.254 | 1.14 | 6.90 | 2.18 | 2.35 |
6 | 133/0.36 | 1.52 | 8.48 | 1.38 | 1.46 |
4
| 133/0.465 | 1.52 | 10.05 | 0.865 | 0.918 |
2 | 168/0.511 | 1.52 | 11.72 | 0.544 | 0.566 |
1 | 208/0.511 | 2.03 | 13.75 | 0.431 | 0.449 |
1/0 | 266/0.511 | 2.03 | 14.76 | 0.345 | 0.359 |
2/0 | 342/0.511 | 2.03 | 16.82 | 0.273 | 0.285 |