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12.3.1* Class A
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A pathway shall be designated as Class A when it performs as follows:
- It includes a redundant path.
- Operational capability continues past a single open, and the single open fault results in the annunciation of a trouble signal.
- Conditions that affect the intended operation of the path are annunciated as a trouble signal.
- Operational capability on metallic conductors is maintained during the application of a single ground fault.
- A single ground condition on metallic conductors results in the annunciation of a trouble signal.
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