NFPA 110, 2010 Edition
- Two pilot lights are required to indicate switch position—normal and emergency. Chapter 6.2.13
Note: Most transfer switches also have pilot lights to indicate available source—normal utility or generator. These lights may not be controlled by voltage sensors and therefore may falsely indicate power availability.
- A means(light) of indicating if the switch is not in the automatic mode. Chapter 6.2.1 (3)
The transfer switch may have other indications that are not code requirements.
- Digital display that reads in code or script. Keep your operators manual available to decipher the codes and warnings.
- “Fail to connect” may mean no power from the generator. Go back to my flowchart.
- “Test” light helps guide you through the manual test mode. See my: “Transfer Switch Controllers” page.
- “Exercise” light means it is in the automatic exercise mode.
- “Battery Low” This refers to the transfer switch internal battery. Some transfer switch computer controls use batteries to maintain settings or create a start signal when both sources are not available. Some of these are replaceable. In any case, you only have three to ten years of life before the battery fails and transfer switch malfunctions. Typically, the “Authorized Service” company will want to replace the entire control. Ask them if it is just a battery problem.
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