Where can correction factors for reductions due to high ambient temperatures be found?

Correction factors for reductions due to high ambient temperatures can be found in NEC Tables 310.15(B)(1) and (2). These tables provide critical information regarding the allowable ampacity of conductors based on different conditions, including temperature. Specifically, they list correction factors that need to be applied to the standard ampacity values when ambient temperatures exceed certain thresholds.

This is essential for ensuring that electrical installations are safe and comply with standards set out in the National Electrical Code (NEC). By referencing these tables, electricians can make informed decisions about conductor sizing to mitigate risks associated with overheating, which can lead to failures or hazards in electrical systems.