Long method de rating factors

[rich3009]

Having used Amtech for so long I can't remember if the de rating factors are applied to the design current or the tabulated regs current, can anyone give me a refresher example calc, I guess it has to be tabulated if it's a current reducing factor

 

[Zdb]

You times all the derating factors together, then divide the rating of the selected protective device by that sum.

 

[Zdb]

E.g In / (Ca×Cg)

In = protective device.
Ca = ambient temperature.
Cg = grouping factor.

Obviously there's are various other rating factors to be considered.