【電氣設計】電路導體及過流保護器件之間的關係（Relation Between Circuit Conductors and Overcurrent Protective Devices）

在電纜選型的Blog中提過，過流保護器件需要同時滿足的條件（基本公式）如下：

Ib <= In <= Iz                      （1）

I2 <= 1.45 x Iz                      （2）

Ib = Design current
Iz = Cable current carrying capacity (already multiplied by Ca, Cg, Ci).
In = Nominal current rating of protection devices.
I2 = The current rating ensuring the effective operation of the protective device, which is also provided by the manufacturer manuals.