At what ambient temperature in degrees Fahrenheit is PVC cable restricted from use unless otherwise specified?

PVC cable is typically limited in use at elevated ambient temperatures to maintain safety and performance standards. The specified restriction point for PVC insulated cables generally aligns with 122 degrees Fahrenheit. This temperature is significant because exceeding it can compromise the integrity of the insulation, leading to potential failures or hazards, such as overheating and electrical Shorts. When operating conditions dictate that temperatures may reach or exceed this level, alternative types of cable or additional protective measures must be considered.

In the context of the other options, while temperatures like 120, 125, and 130 degrees Fahrenheit might also be associated with electrical applications, they do not represent the specific restriction point established for PVC cables. Therefore, it's essential to adhere to the 122 degrees Fahrenheit benchmark when evaluating the usage limit for PVC insulated cables to ensure compliance with safety regulations and to prevent insulation breakdown.