When an AC system is grounded, grounded conductors must be routed with ungrounded conductors at what voltage level?

The correct answer is related to the National Electrical Code (NEC) requirements for the routing of conductors in AC systems. Specifically, grounded conductors must be routed alongside ungrounded conductors when the voltage is 1,000 volts or less. This is crucial for ensuring safety and compliance with electrical standards.

The NEC establishes guidelines to mitigate risks of electrical faults and to maintain proper functionality within electrical systems. By mandating that grounded and ungrounded conductors are routed together at this voltage level, it helps prevent unnecessary electrical hazards such as electrical shock or fire.

Understanding these requirements is essential for electricians working in residential, commercial, or industrial settings, as violating these can lead to non-compliance with electrical codes and potential safety issues.