Class A fire alarm conduit separation

[John Burkeen]

I don't know if you can help me with this but I'd certainly apprieciate it if you can. In the NFPA 72 section 6.4.2.2.2 it states that all outgoing and return circuits shall be installed in separate conduits. Exception #3 states that if you are in a room not exceeding 1000' squared you can install outgoing and return circuits for multiple devices in a single conduit. My question is if the control unit is installed in a room smaller than 1000' square do i have to maintain the 1' vertical and 4' horizontal separation for outgoing and return conduits? Please advise and thank you for your time.

 

[Gregg Harris]

I don't know if you can help me with this but I'd certainly apprieciate it if you can. In the NFPA 72 section 6.4.2.2.2 it states that all outgoing and return circuits shall be installed in separate conduits. Exception #3 states that if you are in a room not exceeding 1000' squared you can install outgoing and return circuits for multiple devices in a single conduit. My question is if the control unit is installed in a room smaller than 1000' square do i have to maintain the 1' vertical and 4' horizontal separation for outgoing and return conduits? Please advise and thank you for your time.

6.4.2.2.2* All styles of Class A circuits using physical conductors (e.g., metallic, optical fiber) shall be installed such that the outgoing and return conductors, exiting from and returning to the control unit, respectively, are routed separately. The outgoing and return (redundant) circuit conductors shall not be run in the same cable assembly (i.e., multi-conductor cable), enclosure, or raceway.
Exception: The outgoing and return (redundant) circuit conductors shall be permitted to be run in the same cable assembly, enclosure, or raceway under any of the following conditions:

1. For a distance not to exceed 3 m (10 ft) where the outgoing and return conductors enter or exit the initiating device, notification appliance, or control unit enclosures.
2. Single conduit/raceway drops to individual devices or appliances.
3. Single conduct/raceway drops to multiple devices or appliances installed within a single room not exceeding 92.9 m² (1000 ft²) in area.

Vertical drops to----

outgoing
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| vertical 10' max = 1000'
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