Current Carrying Capacity Calculator for Electrical Cables

This tool calculates the maximum continuous current-carrying capacity of insulated conductors with nominal voltage not exceeding 1 kV a.c. or 1.5 kV d.c., based on Tables B.52.2 to B.52.13 of IEC 60364-5-52. It ensures that conductor temperature does not exceed the insulation's thermal limit during normal operation.

Input Parameters

• Method of Installation: According to IEC 60364-5-52 (Table A.52.3), such as open air, in conduit, buried, etc. Note: Not all methods are recognized in every country's regulations.
• Conductor Material: Copper (Cu) or Aluminum (Al), affecting resistivity and thermal performance
• Insulation Type:
  • Thermoplastic (PVC): Conductor temperature limit 70°C
  • Thermosetting (XLPE or EPR): Conductor temperature limit 90°C
• Wire Size (mm²): Cross-sectional area of the conductor
• Ambient Temperature: Temperature of surrounding medium when unloaded:
  • Air temperature correction factor: IEC 60364-5-52 Table B.52.14
  • Ground temperature correction factor: IEC 60364-5-52 Table B.52.15
  • Soil thermal resistivity correction: IEC 60364-5-52 Table B.52.16
• Number of Loaded Conductors: Actual number of current-carrying conductors:
  • Direct current: 2
  • Single-phase: 2
  • Two-phase without neutral: 2
  • Two-phase with neutral: 3
  • Three-phase without neutral: 3
  • Three-phase with neutral (balanced load, no harmonics): 3
  • Three-phase with neutral (unbalanced load or with harmonics): 4
• Total Harmonic Distortion (THD): Total 3n harmonic current content. If unknown, use total harmonic distortion value for estimation
• Phase Conductors in Parallel: Identical conductors can be connected in parallel; maximum permissible current is the sum of individual core ratings
• Circuits in the Same Conduit: Number of circuits inside one duct powering different loads (e.g., 2 lines for 2 motors). Reduction factors from IEC 60364-5-52 Table B.52.17 apply.
• Derating Factor for Parallel Cables (if present): Applies when multiple sets of cables are installed in a single duct. Each set includes: one conductor per phase + single neutral (if required) + single protective conductor.

Output Results

• Maximum continuous current (A)
• Corrected value for ambient temperature
• Reduction factor for multiple circuits
• Harmonic derating factor
• Reference Standards: IEC 60364-5-52, Tables B.52.2–B.52.13

Designed for electrical engineers and designers to select appropriate insulated cables for low-voltage power distribution systems, ensuring safe and compliant operation.