Dual powered smoke detectors?

[tomn]

Hello,
While changing a bathroom ceiling light fixture for a client, I was attempting to turn off the circuit (of course) and couldn't isolate a single breaker powering the circuit. After some trial-and-error, I turned off the 2 breakers marked Smoke1 and Smoke2, and the ceiling light turned off as well. That got me wondering, so I traced all the devices on that circuit and found that the ceiling fixtures in the master bedroom, several outlets, and ceiling fixtues in the master walk-in closet were all on this dual-powered circuit. Does this mean the original electrician powered the interconnect wire (it's a 14-3 cable)? Isn't this illegal? And unsafe?
Tom

 

[Dennis Alwon]

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