Portable cords are also rated as heavy duty, medium duty and light duty. These designations are given based on the jacket used on the cord. All four types (SJ cable, SJO cable, SJOW cable; and SJOOW cable) are considered heavy duty, due to their thermoset rubber jackets. Portable cord with thermoplastic elastomer jackets are considered medium duty and those with thermoplastic jackets are designated as light duty.Also can tell what type of jacket the cord has by reading the letters as well. A thermoplastic elastomer jacket will have the letter "E", usually after the "S" or "SJ" depending on the service type. A thermoplastic jacket will have a"T" instead of an "E" in the same spot. The absence of an "E" or a "T" means it has a thermoset rubber jacket.
The letter meaning:
S-Service
J-Junior 300v
O- oil resistant outer jacket
OO- oil resistant insulation and an oil resistant outer jacket
W-weather and water resistant
UL listed/CSA approved for indoor or outdoor use.
Structure
Reference Standard: UL62
Rated Voltage: 600V or 300V
Temperature: 65°C;75°C;90°C;105°C
Conductor:Copper or Tinned Copper
Insulation: EPDM/EPR
Sheath: CPE/Neoprene
Product description:
1) Size: 18 AWG-10AWG
2) Core No: 2 to 3
3) stranded bare copper conductor.
4) Color-coded PVC insulation.
5) Rated temperature: 60°C 75°C 105°C
6) Rated voltage: 300 Volts
7) Passes UL VW-1 & CSA FT2 flame test.
Construction:
类型 | 导体 | 绝缘 | |||
AWG | No. of Conductor | Construction | Nom. Thickness | Diameter | |
SPT-1 | 20 | 2 | 26/0.16 | 0.76 | 2.5×5.0 |
3 | 26/0.16 | 0.76 | 2.5×7.4 | ||
18 | 2 | 41/0.16 | 0.76 | 2.7×5.4 | |
3 | 41/0.16 | 0.76 | 2.7×8.0 | ||
SPT-2 | 18 | 2 | 41/0.16 | 1.14 | 3.5×7.0 |
3 | 41/0.16 | 1.14 | 3.5×8.7 | ||
16 | 2 | 65/0.16 | 1.14 | 3.7×7.4 | |
3 | 65/0.16 | 1.14 | 3.7×9.6 | ||
SPT-3 | 18 | 2 | 41/0.16 | 1.52 | 4.5×9.0 |
3 | 41/0.16 | 1.52 | 4.4×10.3 | ||
16 | 2 | 65/0.16 | 1.52 | 3.7×7.4 | |
3 | 65/0.16 | 1.52 | 4.8×11.2 | ||
14 | 2 | 41/0.254 | 2.03 | 6.3×12.6 | |
3 | 41/0.254 | 2.03 | 6.3×13.5 | ||
12 | 2 | 65/0.254 | 2.41 | 7.6×15.2 | |
3 | 65/0.254 | 2.41 | 7.6×15.8 | ||
10 | 2 | 65/0.32 | 2.79 | 9.1×18.2 | |
3 | 65/0.32 | 2.79 | 9.1×18.8 |