The calculations outlined in this standard are typically used alongside IEC 60909 , which provides the initial short-circuit current values. Mechanical Impact on Conductors
The load transferred to support structures, insulators, and foundations. iec 60865-1
The impact of forces acting on rigid and flexible conductors. Thermal Effects: The heating impact on bare conductors. The calculations outlined in this standard are typically
For practical use, the standard provides , allowing engineers to compare the "thermal energy" of a decaying short-circuit current with a constant current of known duration. This directly yields the minimum conductor cross-section needed to avoid excessive temperature rise. Thermal Effects: The heating impact on bare conductors
These are typically found in busbar systems. The standard provides formulas to calculate the maximum electromagnetic force ( Fmaxcap F sub m a x end-sub
The standard is typically used in conjunction with , which deals with the calculation of short-circuit current magnitude. While IEC 60909 answers the question "How strong is the current?", IEC 60865-1 answers "What does that current do to the equipment?"
One of the most critical aspects of the standard is the calculation of mechanical effects. When current flows through a conductor, it generates a magnetic field. During a short circuit, the current can rise to tens of thousands of amperes instantaneously. This creates immense electromagnetic forces between conductors.