What is the maximum continuous load that can be drawn from a 400A company switch?

The maximum continuous load that can be drawn from a 400A company switch is typically less than the rated capacity to ensure safety and account for potential overloads. Generally, the National Electrical Code (NEC) allows the continuous load to be calculated at a maximum of 80% of the rated capacity for circuits and equipment.

In the case of a 400A company switch, applying the 80% rule indicates that the maximum continuous load should be evaluated as:

400A x 0.8 = 320A.

This calculation ensures that the switch operates safely within its limits, reducing the risk of overheating and allowing for possible peak loads without causing issues. Therefore, a continuous load of 320A is considered safe and appropriate for a 400A company switch, making it the correct answer.