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EV Charging Calculator

IEC 61851-1 · IEC 60364-7-722 · IEC 62955 — charge point cable/breaker/RCD sizing for a single point is free. Multi-point site demand with load management diversity is a subscriber feature.

AAJappsEngineering Calculation Report

EV Charging Calculator

IEC 61851-1, IEC 60364-7-722, IEC 62955

Generated

For preliminary engineering use only — always verify results against project-specific standards and a qualified engineer's review before use in a real design.

Charge point

V
A

Cable & installation

m
°C
Simplified sizing (ambient + grouping only). For buried runs, soil resistivity, or harmonic-heavy sites, cross-check in the full Cable Sizing calculator.

Protection & earthing

A dedicated circuit is required for each EV supply point — do not share the circuit with other loads.

Multi charge point site

Subscriber
A
m

Charge point sizing result

Design current Ib32.0 A
Recommended cable size4 mm²
Derated ampacity40.0 A
Voltage drop3.81%
Recommended breaker32 A
Type A (or F) RCD + RDC-DD per IEC 62955 — the RDC-DD trips on ≥6mA smooth DC before it can blind the upstream Type A RCD; together this is treated as equivalent protection to a Type B RCD.

Multi charge point site

No Load Management System — IEC 60364-7-722.311 requires a diversity factor of 1 (no reduction): design as if every charge point could run at full rated current simultaneously.
Raw total (no diversity)320.0 A
Diversified design current320.0 A
Recommended feeder size120 mm²