ConEd gas detector activations: new procedure?

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Lately I’ve been hearing dispatchers transmit this often: “Units responding into Box XXXX, respond in emergency mode, ConEd is reporting a natural gas detector activation at the point of service entry inside the building. X% of the LEL has been detected.” I had never heard this before recently. Is it a new procedure? If so, is the notification coming directly from a ConEd detector that reports remotely, and is there a certain LEL reading that puts units in emergency mode? Thanks in advance.