95 mm² copper is rated about 258 A installed per Method C (clipped direct, 70 °C thermoplastic) and drops 0.5 mV/A/m (single-phase figure, matching BS 7671 Appendix 4 within rounding). The chart shows how far it runs before the drop exceeds the limits.
| Load | 230 V @ 3% | 230 V @ 5% | 400 V 3Ø @ 5% |
|---|---|---|---|
| 6 A | 2428 m | 4046 m | 8126 m |
| 10 A | 1457 m | 2428 m | 4875 m |
| 16 A | 910 m | 1517 m | 3047 m |
| 20 A | 728 m | 1214 m | 2438 m |
| 32 A | 455 m | 759 m | 1524 m |
| 40 A | 364 m | 607 m | 1219 m |
| 63 A | 231 m | 385 m | 774 m |
Computed with ρ ≈ 0.0225 Ω·mm²/m (copper at operating temperature), matching BS 7671 Appendix 4 mV/A/m values within rounding. Grouping, insulation type and installation method change the amp rating — treat 258 A as the Method C reference figure.
The nearest equal-or-larger AWG size is 4/0 AWG — see the gauge converter for exact areas.
About 258 A for copper clipped direct (Method C). Enclosed in conduit in insulation it derates substantially — always check the installation method column in BS 7671 Appendix 4.