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What should be used to isolate a 911 2-wire CAMA circuit?

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What should be used to isolate a 911 2-wire CAMA circuit?

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A 7501-16 must be used. The CO might be looking for a negative voltage referenced to the ground. If this is the case, a proper Modification Bulletin must be implemented: #7501-15-40 (7501-16A), #7501-15-41 (7501-16B) or #7501-15-42 (7501-16C).

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