Short-circuit Maximum Peak Value for Busbar Trunking Systems

The permissible peak current, peak l, of the Busbar Trunking System must be greater than the peak value of the assumed asymmetrical short-circuit current, asymm. Isc.

The value of the asymmetrical short-circuit current is obtained from the value of the symmetrical short-circuit current, Isc, multiplied by a standardized asymmetry factor (k).

The first value of the 1st short-circuit asymmetry peak in the transient state is the one that is taken into account.

Reference: Coordination and protection of busbar distribution - Schneider Electric