Cable Sheath Voltage

IEC 60287-1-1 · ENA Engineering Recommendation C55

Calculate induced sheath voltages and circulating currents for MV/HV single-core cables. Determine bonding method, ENA C55 link box type, and SVL requirements.

IEC 60287-1-1 — Induced Sheath Voltage• Arbitrary cable positions (drag to reposition)• Single-point / Solid / Cross-bonded• ENA C55 LB1/LB2/LB3 diagram (SVG + PNG export)

Cable Cross-Section — Drag to Reposition(top-down view, showing cable sheaths)

PresetCustom

Set equal spacing

Keeps current formation (Custom), adjusts spacing

Current Spacings

S_AB (A→B)91.7 mm

S_BC (B→C)120.0 mm

S_AC (A→C)91.7 mm

GMD (geometric mean)100.3 mm

Cable & System

Voltage Class

Conductor Size (mm²)

Cable OD (mm)

For diagram proportions

Sheath Mean Radius r_m (mm)

(r_inner + r_outer) / 2

Conductor Current (A rms)

Circuit Length (m)

System Frequency

Bonding Method

Sheath Bonding Arrangement

Minor Sections per Major Section

Spacings from layout

S_AB

120 mm

S_BC

120 mm

S_AC

120 mm

Position cables & calculate

Drag cables in the layout above, then click Calculate

Based on IEC 60287-1-1:2006 and ENA Engineering Recommendation C55 (Link boxes for HV cable sheaths). Sheath voltage formula valid for balanced 3-phase systems. Verify SVL selection against system fault current and protection clearance time.