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The conductor must be sufficiently sized and securely installed in the switchboard to accept the thermal and electrodynamic stresses of the fault current.
It must be connected to the exposed conductive parts of the switchboard.
It must be accessible to enable connections both in the factory and on site.
The cross section of the conductor as per IEC standard is SPE = √I2t / k or it can be as the manufacturer values based on the equation mentioned.