Telephone cables include the following types:
- 250V TTY, FA-TTY
- 250V TTYC, FA-TTYC
- 250V TTYCY, FA-TTYCY
Applicable standards:
- – Design guide: JIS C 3410(1999)
- – Flame retardant: IEC 60332-1 / IEC 60332-3 Category A (FA-Type)
- – Cold bend/impact: CSA 22.2 No. 03 (-35oC) (Cold Type)
- – Max. conductor temperature: 60oC
Phone cable structure:
| Group | Code | explain |
| 1. Conducting cores | Tt | Copper wire according to JIS C 3410 |
| 2. Electric | – | PCV according to JIS C 3410 |
| 3. plait | 2 twine in pairs | |
| 4. Casing | Y | PVC according to JIS C 3410 |
| 5. grid | C | Zinc Dip Steel |
| 6. paint | White paint if it is a steel mesh | |
| 7. Outer shell | Y | PVC according to JIS C 3410 Black |
| 8. Determine the color | Print letters in pairs |
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