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Section 310.15(A)(3) describes the temperature limitation of conductors. This information is essential to avoid overheating of the insulation.
The main rule here is that a conductor may never be used in a way that would allow its operating temperature to be exceeded. This includes consideration of other adjacent conductors.
For example, if a 60° C conductor is installed alongside a 90° C conductor, the 90° C conductor must be limited to a 60° C operating temperature. Otherwise it could cause overheating in the lower-rated conductor.
© Hughes Associates,Inc. 2012