Mixing Fire Alarm Systems from 2 buildings?

[nietzj]

I have a situation with a tunnel connecting 2 separate buldings and would like to share the same raceway with 2 totally different fire alarm systems. I know this is not ideal but it would be nearly impossible to add a new conduit and open wiring is not an option. Is this a code violation?

 

[don_resqcapt19]

Permitted as long as both fire alarms systems are of the same type, that is either power limited, or non-power limited. 760.135.

 

[gadfly56]

Yep, what don said.