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

Conductor Selection & Application

Ampacity

Multiple Ampacities

Section 310.15(A)(2) mentions the fact that there can be more than one ampacity along a given circuit length.

The four factors mentioned in the Informational Note as affecting operating temperature can also affect the ampacity of a circuit:

Ambient temperatures – There can be different ambient temperatures along the way.
Heat produced by current flow – For some types of circuits there may actually even be different amounts of load current flow because the conductor supplies more than one load. 
Ambient medium – There can be different conditions in the ambient medium that would affect the conductor's ability to dissipate heat.
Adjacent conductors – At different places along a conductor there can be different numbers of other adjacent load carrying conductors.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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