NEN 1010 §434
Prospective short-circuit current
Prospectieve kortsluitstroom (Ik)
Also known as: kortsluitstroom, ik, short-circuit, short-circuit-current, prospective-short-circuit, kortsluitstroom-berekening, icc-transformator, uk-4-procent-icc
Prospective short-circuit current (Ik). The current that would flow at a dead short at the measured point. Determines whether the switching equipment has the breaking capacity to safely interrupt that current — typically 6 kA for final circuits, 10–25 kA in distribution boards.
Practical example
Prospective short-circuit current (Ik). At a distribution board near the transformer, an Ik of 15 kA is measured; the installed switching equipment must have a breaking capacity of at least that value.
Common mistake
Prospective short-circuit current (Ik). Common mistake: Selecting switching gear based on rated current only, without checking prospective short-circuit current — the breaker may self-damage during a real short circuit.
See also
Related terms
In-depth guides
- → §434 / IEC 60909-0 Prospective short-circuit current — from Ik'' at the point of connection to the required Icu of switchgear
- → §434 Short-circuit protection & the adiabatic equation — §434
- → IEC 60909-0 Short-circuit current calculation per IEC 60909-0 — the equivalent voltage source method
- → §551 / IEC 60364-5-55 Fault-current capability of a standby generator — why protective devices can behave differently on generator power
- → §712 Solar Power Systems (PV)
- → PGS 35 / IEC 62282-3-100 Hydrogen fuel cells as backup power — safety aspects alongside diesel and battery UPS
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