Factor $h_1$ for emergency load

This factor $h_1$ is used to calculate $I_2$.

It is the factor between the constant current applied to the cable prior to the emergency loading $I_1$ ($=I_c$) to the sustained (100% load factor) rated current $I_R$ for the conductor to attain, but not exceed, the standard maximum permissible temperature $\theta_{max}$.

Used in