300/500V PVC insulated Class 5 flexible copper wire. Fine-stranded conductor for panel wiring, instrument connections, and flexible internal equipment wiring. Full range of cross-sections and colours.
This 300/500V Class 5 fine-stranded flexible copper wire is the standard choice for control panel internal wiring, instrument connections, and equipment internal wiring where the wire must be routed around bends, dressed neatly to terminal blocks, and occasionally repositioned during panel modification or maintenance. Class 5 fine stranding provides the flexibility for tight-radius routing that solid or coarsely stranded conductors cannot achieve without kinking.
The 300/500V rating is appropriate for the majority of control panel wiring applications — PLC I/O connections, relay wiring, sensor circuits, and 24V DC control bus wiring all operate well within this voltage class. The full range of IEC colour-coded options allows correct conductor identification throughout the installation.
| Cross-Section | DC Resistance | Current (in air) |
|---|---|---|
| 0.75 mm² | 26.0 Ω/km | 14 A |
| 1.0 mm² | 19.5 Ω/km | 17 A |
| 1.5 mm² | 13.3 Ω/km | 22 A |
| 2.5 mm² | 7.98 Ω/km | 30 A |
| 4.0 mm² | 4.95 Ω/km | 40 A |
Use brown/black/grey for the three AC phases, blue for neutral, and green/yellow for earth — matching IEC 60446. For DC circuits: red for positive, blue for negative (or black per some national standards). Consistent colour coding throughout the panel eliminates ambiguity during commissioning and maintenance.
1.0mm² is the minimum practical cross-section for terminal block connections — smaller cross-sections are fragile at screw-clamp terminals. 1.5mm² is the standard for most control panel wiring, providing adequate current capacity for digital I/O and analogue signals with good mechanical robustness at the terminal.
