According to 200.3, premises wiring shall not be electrically connected to a supply system unless the supply system contains a corresponding grounded conductor. What is an exception to this rule?

• For separately derived systems that are not connected to a utility supply.
• For listed utility-interactive inverters in distributed resource generation systems where the premises wiring or utility system includes a grounded conductor.
• For systems operating at less than 50 volts.
• For temporary wiring installations of less than 90 days.