using existing wires for smoke detectors

teamo

I hardwired in BRK's throughout the house in 2002. I was going to replace all of the detectors with new ones in the coming year but I have decided to use the fire zones on my security system and install all new low voltage detectors which are much less prone to false tripping than line voltage type. I am planning on running new 18/2 fire alarm cable but I was wondering if it would be acceptable to disconnect and remove the 14/2 NM from the power source and run the fire alarm cable from the alarm panel in it's place. I would then use two of the conductors in the remaining 14/3 NM (red and black capping off the white conductor) throughout the house for the low voltage detectors. Any technical or code reason why I should not do this?

electures

Check with your local building department before removing the existing detectors. Your local codes may require they remain.

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All responses based on the 2011 NEC.
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teamo

I know the local code they do not have to remain.

ddawg16

Well....a simple internet check came up with this....



So....I guess you can do what you want....since you already know the code.....

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teamo

Thanks for the replies. I am not asking about detector requirements or placement. I have a photoelectric smoke inside every bedroom as well as one in the hallway within ten feet of each bedroom doorway. I could have installed only one in the hallway and have met the code but I put one inside of every bedroom as well. CO's are allowed to be separate from the smoke detectors and can be either battery, hardwired, or the plug in type. We have a plug in type on every level of living space within the home as allowed by Mass Law as well as the local AHJ.
I am asking about using the NM conductors for the low voltage smokes or if it would not be allowed to use such a cable and if I would be required to pull new 18/2 fire alarm cable.