FA Wiring

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mstrlucky74

Senior Member
Location
NJ
Which style or class wiring requires the return loop to be in separate conduit( if run in conduit)? And is it for initiating or signaling devices or both? Thanks
 

gadfly56

Senior Member
Location
New Jersey
Occupation
Professional Engineer, Fire & Life Safety
Separation(comduits) is required for all Class A? Thanks

It can also be for any or all of the following: the signal line circuit (SLC, for addressable alarm devices), indicating device circuit (IDC, for conventional alarm devices) or the notification appliance circuit (NAC, for horns, horn/strobes, speakers, chimes, bells, etc.).
 

cadpoint

Senior Member
Location
Durham, NC
I leave the F/A alone for the professionals but I have some questions, I have run enough of the pipe for that guy!

Separate (conduits) are/ is required for all Class A? Thanks
....

It can also be for any or all of the following: the signal line circuit (SLC, for addressable alarm devices), indicating device circuit (IDC, for conventional alarm devices) or the notification appliance circuit (NAC, for horns, horn/strobes, speakers, chimes, bells, etc.).

So all the above are Class A?

Yes separate conduits are required although you can drop to devices with a single conduit up a maximum of 10'.
Wow, how can you do that? If it's a separate home run conduit and then you cut in a box and drop a line for in and out is the rest of the conduit now just the Home Run? Sounds like a Alt/Add or a miss of the original
layout?
 

iwire

Moderator
Staff member
Location
Massachusetts
Wow, how can you do that? If it's a separate home run conduit and then you cut in a box and drop a line for in and out is the rest of the conduit now just the Home Run? Sounds like a Alt/Add or a miss of the original
layout?

No it is not an after thought, it is good planing. Run you loop conduit along the permiter wall and do single drops down from that to pick up a pull station on a wall at a door or a horn strobe on a wall etc.
 

gadfly56

Senior Member
Location
New Jersey
Occupation
Professional Engineer, Fire & Life Safety
Unless you are in Rhode Island, they require the EOL resistor for class B systems to be at the FACP.

In that case, pull the extra foot and land it as Class A. Unless the field wiring doesn't have to be separated and the feed and return run in the same pipe.
 
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