Fire alarm ckts

[mstrlucky74]

What type of cable(power limited or non-power limited are used for the following ckts. I know you can use thhn in some instances but disregarding that for now.

IDC/SLC ckts.
NAC ckts
24v power for fire alarm.

thanks

 

[GrayHair]

In my experience, cable/wire type (power limited or non-power limited) was always determined by the power supply (FACP, NAC Booster, Aux Power Supply, etc) for the circuit. I haven't kept up with codes since retiring.

 

[luckylerado]

What type of cable(power limited or non-power limited are used for the following ckts. I know you can use thhn in some instances but disregarding that for now.

IDC/SLC ckts.
NAC ckts
24v power for fire alarm.

thanks

FPLR or FPLP (riser or plenum) are very common for fire alarm systems.
16 or 18-2 non-shielded for SLC/IDC
14-2 non-shielded for horn and strobe NACs and 24V.
16-2 Shielded for voice or audio speaker appliance

Those are typical. Voltage drop should be considered when sizing. Follow manufacturer instructions. Some SLC/IDC are shielded.

Other factors that should be considered:

?pipe or free air
?Length
?Classification of space
?Sharing an enclosure with 120V power
?Temperature and environmental conditions
?survivability requirements or project

 

[lowvoltageeng]

What kind of cable?

What kind of cable?

Right, what he said above. I don't think you'll ever use non-power limited, I never have. I think that was what they used back in the day.

John

 

[gadfly56]

Right, what he said above. I don't think you'll ever use non-power limited, I never have. I think that was what they used back in the day.

John
lowvoltageeng.com

Early Pyrotronics ionization smokes operated at 250vdc.