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

Conductor Selection & Application

Minimum Size to Avoid Overheating Terminals

Minimum Size to Avoid Overheating Terminals, cont.

Section 310.15(A)(3), Informational Note No. 2 says to refer to Section 110.14(C) for the temperature limitation of terminations.

Section 110.14 is a set of general requirements that deal with making connections and terminations of conductors. Section 110.14(C) is specifically about the terminal temperature ratings, that is, the actual temperature ratings of the devices that are used to make splices or connections.

This rule considers both the supply end and the load end. The rule actually comes from listing standards where the two ends are considered separately. Under the listing standards, the load end is considered the end connected to an appliance, where there is actually a load of some sort, and the supply end is sometimes considered the overcurrent device.

Section 110.14(C) Temperature Limitations. The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the lowest temperature rating of any connected termination, conductor, or device. Conductors with temperature ratings higher than specified for terminations shall be permitted to be used for ampacity adjustment, correction, or both.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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