Can any one give an explanation about rating factors of cable? if we are laying

Can any one give an explanation about rating factors of cable?
if we are laying the cable on the air with an temp 15 degree then rating factors will be 1.15 and if we are laying the cable on the air an temp 60 degree then rating factor will be 0.76 please describe it and what is the difference between rating factor and derating factor?

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