According to NEC Article 100, which temperature rating column should be referenced when using a 75°C conductor with equipment marked for 60°C?

In the context of the National Electrical Code (NEC) and its Article 100, when determining the appropriate temperature rating to reference, it's essential to align the conductor's temperature rating with the equipment's rating. The equipment marked for 60°C signifies that it is designed to operate safely under the limits of that temperature.

Using a conductor rated for 75°C with such equipment means that the conductor can operate safely up to 75°C, but since the equipment is only rated for 60°C, its limitations must prevail to ensure the safety and integrity of the electrical system. Therefore, referencing the 60°C temperature rating column is correct since it reflects the maximum allowable temperature for the equipment, regardless of the conductor’s higher capability. This ensures compliance with safety standards by adhering to the lower temperature rating to avoid overheating and potential damage to the equipment.

In this way, consistency with the equipment's specifications is maintained, ensuring both safety and code compliance.