Is there a code in NFPA define or recommend the type of power feed for fire safety dampers (either 240vac or 24vac or 24vdc)?
We have the same question.
As far as I see, more important the the voltage itself, is the required performance. So, if you don't need to change damper position in an emergency situation, be sure to specify the right kind of actuator to this safety position (ex.: fire & smoke actuator with spring return).
But if you need to change damper position during an emergency (ex.: smoke control or exhaust systems) your attention must be driven to the power and the electric line survivability to your expected emergency conditions. Considering that your damper will remain in place and working for a specific time, you need to have energy and electrical infrastructure to be able to drive this damper for the same or part of this time.
Another point to take into consideration, is the voltage allowed in your regulations for equipment that must be with energy in fire (and water) situations. Normally, just extra low voltage (less than 30V) are permitted.
It's not a straight answer, but I hope it helps in your decisions.
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