According to NEC, how much overload protection is required for each ungrounded service conductor?

The correct response indicates that overload protection must be adequate for all circuits connected to each ungrounded service conductor. Under the National Electrical Code (NEC), overload protection is essential to prevent excessive current that could lead to overheating and potential fire hazards. Each ungrounded service conductor must have protective devices that will interrupt the electric current in the case of an overload condition.

This requirement helps ensure that the entire system is safeguarded against faults and that every circuit receives appropriate protection tailored to its load capacities. By specifying that the protection must be adequate for all circuits, it emphasizes the comprehensive responsibility of the electrical installation to maintain safety and reliability.

In this context, the other perspectives regarding overload protection may not encompass the necessity for broad application across multiple circuits or may suggest lesser requirements that could compromise safety. Therefore, having overload protection considered as adequate for all circuits reinforces the importance of compliance with safety standards for all connected conductors.