Cable Ampacity Calculation Software

ETAP covers a broad range of cable ampacity methods and standards. IEEE, IECA, and NEC cable ampacity are part of the Base Module. The British Standard and IEC Standard methods may be purchased individually as additions to your ETAP package.

  • IEEE – IEEE Standard 399 – Recommended Practice for Industrial and Commercial Power Systems Analysis
  • ICEA – ICEA P-54-440 – Ampacities of Cables in Open-Top Cable Tray
  • NEC – NFPA 70 – National Electrical Code
  • British Standard – BS 7671 – Requirements for Electrical Installations
  • IEC – IEC 60364-5-52 – Selection and Erection of Electrical Equipment – Wiring Systems

ETAP Cable Ampacity is simple and straightforward to utilize. As an example, for above ground trays, enter the tray height, tray width, and the percentage fill. The software calculates the de-rated Ampacity, using the specified ambient and conductor operating temperatures.

Types of cable installation:

  • A/G Conduit
  • A/G Trays
  • Air Drop – Suspended
  • Architrave
  • Brackets
  • Building Voids
  • Channel
  • Cleats
  • Embedded Direct
  • Ladder
  • Masonry
  • Open & Clipped
  • Trenches
  • Trunking
  • U/G Direct Buried
  • U/G Duct Bank
  • Window Frame
  • Wire Mesh


For duct banks design, enter the number of rows & columns, the ambient temperature, and thermal resistivity of the soil. ETAP calculates the de-rated ampacity for the hottest location, not exceeding the maximum operating temperature.


For more details on Cable Ampacity Calculation, please refer to our Cable Ampacity page.

The cable system calculations of ETAP cable ampacity calculation software are designed to represent real life scenarios, new designs, and flexible simulating environment for an optimized solution. Based on the Standard provided above, this cable ampacity analysis tool is extremely handy and in a matter of few minutes, the cable ampacity for any kind of installation can be computed.

With a selection from a wide range of cables from the ETAP comprehensive Cable Library, this Cable Ampacity Calculation program is extremely easy to use. In addition, all the cables in the ETAP Cable Library are verified and validated following on our nuclear QA program.