My first response would be "No" because I think the specs on the fire alarm system will tell him the wire to use and NEC Article 760 doesn't list NM cable as one of the cables suitable for a fire alarm system.
Fire alarm panels typically have brand-specific detectors, separate signalling devices, and are installed complete by the alarm contractor.
Your typical house, however, has independent alarm detector/ signalling units that are interlinked. These detectors work off of 120 volts, have a battery for back-up power, and are (these days) installed so that if one sounds, they all do. These household detectors are often installed on their own dedicated circuit, using 14/3, with the third conductor used to "communicate" any alarm to other units.
Dedicated "fire alarm" cable is an entirely different thing, and is NOT used for line voltage or power applications.
Now, it is possible to tie household alarms into a central-station alarm panel- using a relay, that ties into the system in a manner just like another smoke detector. The alarm contractor should know exactly which parts to use, and all the EC needs to know is where to run the wire.
That said- and I mean no disrespect to the alarm trades- but alarm installers typically have a very limited, brand specific training. They have been taught one way, the only way for the brand they install, and sometimes get a little confused.
I see nothing in Article 760 that would prohibit the use of NM for fire alarm system wiring. 760.61(C)(3) permits the use of any Chapter 3 cable as long as conductors in the cable are copper and at least 26 gauge. Don
Don, that section (760.61(C)(3) goes on to say... " nonconcealed spaces where the lenght does not exceed 10ft"
I can't find any code reference that allows other than fire alarm cable for this interconnection.
I have Limited fire alarm wiring knowledge. But I was told by an alarm installer that the fire alarm wiring had to be 2 hour rated fire alarm wire. I see most of the installers useing a red colored cable for the alarm wiring in residential...
This house was roughed in for hard wired smokes with 14-3 romex and this installer said he could use my wire to interconnect his smoke alarms...
Don you'd be right if it were a Power Limited system but I don't think that's what the post was about. The installer was installing a Non-Power Limited system. I don't think I've ever been involved with a power limited system. The systems going in today are Non-Power Limited and the cables need to comply with 760.31