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NOTE: This is an unformatted excerpt from our online fire protection training library.

Conductor Selection & Application

Ampacity

Temperature Limitation of Conductors

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.

Section 310.15(A)(3) includes Informational Note No. 1 listing the “primary determinants of operating temperature” that must be addressed to avoid overheating of a conductor or its insulation:  Heat produced by current flow in the conductor Ambient temperature Ambient medium Adjacent current carrying conductors
NOTE: This is an unformatted excerpt from our online fire protection training library.

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