The standard formerly known as IEC 949 is now designated as IEC 60949. Its primary focus is the calculation of thermally permissible short-circuit currents, specifically accounting for non-adiabatic heating effects in electrical cables. Key Content and Purpose
She opened it. The first ten pages were crisp. Then came the nightmare. Page 11 was a tilted, low-resolution scan of a hand-drawn cable routing diagram. The legend was unreadable. Page 12 showed a thermal image, but the temperature scale had been lost in compression.
IEC 949 is an essential standard for ensuring the safety of machinery, which is critical for several reasons: iec 949 pdf work
Some manufacturer websites (Prysmian, Nexans, Southwire) offer free non-adiabatic calculation tools. However, verify they follow IEC 60949 explicitly.
The "work" in "IEC 949 PDF work" refers to performing these non-adiabatic calculations, often using spreadsheet tools or specialized software. The standard formerly known as IEC 949 is
Non-Adiabatic Modifying Factor: The standard then applies a modifying factor to the adiabatic result to account for heat transfer to adjacent materials. This allows for a more realistic (and often higher) permissible current rating, which can lead to cost savings by preventing over-sizing of cables. Common Applications in Power Systems IEC 60949 Compliance for High Voltage Cable Systems
The standard is a copyrighted publication and is typically available for purchase in PDF format from official standards organizations: The standard is a copyrighted publication and is
This is the base rating, assuming no heat escapes the conductor during the short-circuit event. Calculate the Modifying Factor (