Quick Answer
The National Electric Code (NEC) requires DC disconnect switches in solar installations to be labeled with the maximum system voltage, DC current, and the words "Main Disconnect" or "Disconnect". The label should also indicate if the disconnect is intended for service or main disconnect. This labeling is crucial for safety and compliance.
DC Disconnect Labeling Requirements
The NEC specifies that the label on the DC disconnect switch should be at least 1 inch wide and 2 inches tall. The label should be placed on the disconnect switch itself or on a nearby accessible location. The maximum system voltage should be indicated in volts (V) and should match the system’s nominal or maximum voltage.
Label Content
The label should include the following information:
- The maximum system voltage (e.g., 600V DC)
- The DC current (e.g., 100A DC)
- The words “Main Disconnect” or “Disconnect” (e.g., “600V DC Main Disconnect”)
- An indication if the disconnect is intended for service or main disconnect (e.g., “Service Disconnect” or “Main Disconnect”)
- The manufacturer’s name or logo
- The date the label was created or updated
Label Placement and Accessibility
The label should be placed in a location that is easily accessible by someone working on the solar system. It should not be obstructed by any other components or wiring. The label should also be visible and able to withstand the elements. The label should be at least 1 inch away from any electrical components or wiring.
The label’s font size should be at least 1/2 inch high, and the text should be clear and legible. The label should be made of a durable material that can withstand weather conditions and physical wear and tear.
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