What is the Ampacity of #8.0 sq. mm. THW wires?

The ampacity of a wire refers to the maximum amount of electric current that a conductor or device can safely carry without exceeding its temperature rating. For #8.0 sq. mm. THW (Thermoplastic Heat and Water-resistant) wires, the standard ampacity values provided by electrical codes and guidelines, such as the National Electrical Code (NEC), specify that these conductors can typically handle currents up to 50 amperes in specific installation conditions.

This higher amperage capacity is supported by the wire's physical properties, insulation type, and ambient temperature considerations. THW insulation makes the wire suitable for being used in moist or demanding environments, allowing for greater current-carrying capability compared to conductors with less robust insulation. In contrast, lower ampacity values listed in other options might pertain to smaller wire sizes or different insulation types, which would limit their safe carrying current under normal operating conditions. Thus, understanding the properties of THW wire and the context of the application helps establish why 50 amperes is the correct ampacity for #8.0 sq. mm. THW wires.