High Voltage Connection Integrity
Calculation tool

Current-Carrying Capacity Calculator

Tube rail, solid rod, plate and flexible cable — heat-balance method per IEC TR 61597 (2021). Indicative, not a certification value.

Conductor type
Environmental conditions

Mind the contact material/joints: bare Al/Cu often 90°C, silver-plated 105°C, insulated cable per insulation class (PVC 70°C, XLPE 90°C).

0.3–0.6 m/s = common reference point for outdoor installations without specific wind data.

Bare/polished ≈0.2 · weathered ≈0.4–0.5 · matte/dark painted ≈0.85.

Current-carrying capacity (single conductor)
2,577 A
OD 80mm
R_AC (at T2)
24.02 µΩ/m
R_DC: 22.27 µΩ/m
P_rad
46.6 W/m
radiation
P_conv
112.9 W/m
Re: 2,586
Skin depth δ
14.3 mm
k_s: 1.078

Log in to view the formulas and intermediate values for this calculation.

Engineering estimate, not a standardised/certified value. Sensitive to Ke, v and the T2 assumption. For a rectangular/square plate an equivalent diameter (perimeter/π) is used for convection and an equivalent radius (√(area/π)) for the skin effect — lower accuracy than for the round variant; verify against manufacturer data or IEC 61439 / IEC 60890 for a final design. Short-circuit strength, mechanical deflection and connection points are not included here.