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Long method de rating factors

Discuss Long method de rating factors in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

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rich3009

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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
 
You times all the derating factors together, then divide the rating of the selected protective device by that sum.
 
[ElectriciansForums.net] Long method de rating factors E.g In / (CaĂ—Cg)

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

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