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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

Three Sizes to Consider

To summarize these requirements, three separate issues must be considered, not necessarily in any particular order:

The minimum size conductor that is adequate to limit the amount of heat actually created in the conductor under its specific “conditions of use.” The issue is determining the minimum size of conductor that is necessary to avoid overheating the insulation in the locations and under the conditions in which it's actually installed. The minimum size conductor that is needed to connect the conductor to an overcurrent device so that it will be compatible with the overcurrent device and the nature of the load, whether it is continuous or noncontinuous. The minimum size conductor that is adequate for the actual load current from the column in Table 310.15(B)(16) that corresponds to the temperature rating of the lowest-rated termination on either end of the conductor.

All three of these considerations may result in the same size or different sizes. All are minimum sizes, so the largest of the three minimums must be chosen.

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

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