For the bend as posted above. Usually all communications pipe is 4"
Fiber can pull surprisingly hard it seems.
Is there a spec? Who is the inspecting authority? When in doubt, 4" with long radius sweeps and never LBs
Wow. I've piped miles of fiber runs and all I've ever used was 1.5" rmc as per our plant wiring standard. We (company guys) ran the pipe and pulled the fiber and outside contractors terminate. It is usually single mode fiber cable about the size of a finger and we've never had a problem with using regular one shot 90s and multiple offsets in the run. I'm guessing there's types of fibers out there that aren't as forgiving as the stuff we use.
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My experience is that it pulls way easier than copper and around here, unless your are pulling for the phone company, it won't be in 4" conduit. It will be in conduit sized for the fill. I often pull 12 fiber cable in 1" conduit for industrial projects.For the bend as posted above. Usually all communications pipe is 4"
Fiber can pull surprisingly hard it seems.
That is just plain stupid....pulling the fiber in and out of j-boxes placed every 100' drastically increases the chance that the fiber will be damaged.Yes there is. OP will find it in EIA/TIA specs/BICSI manuals. It is not code but recommended specs for all telecommunications cabling. Be glad they arent code, they are much more restrictive than the NEC (e.g., no more than 2 quarter bends in conduit and pull boxes every 100'). ...
That is just plain stupid....pulling the fiber in and out of j-boxes placed every 100' drastically increases the chance that the fiber will be damaged.
That is just plain stupid....pulling the fiber in and out of j-boxes placed every 100' drastically increases the chance that the fiber will be damaged.
I often use a length of wireway as a pull box and use it in place of LBs for 90° bends.You place the pull boxes in straight runs. They are there only if you need intermediate pull points. DO NOT USE THEM FOR BENDS.
My experience has been that the fiber pulls easier than other cables, either communication or electrical.Not just for fiber but other cables as well. I remember one job we did early on where the EC sucked a string line then pulled a mule tape thru 170' of 3" conduit (that the EC installed) for our 100pr and maybe 15 cat5e/cat6 cables. 5 quarter bends, 4 after we removed the unnecessary fifth bend. Plenty of wire lube used. Conduit fill maybe 15%. Pull got to the 3rd quarter bend and stopped. No amount of massaging or brute force would get it thru. Mule tape broke. Used a 200' Greenlee metal fish tape, that too broke. ~130' of slicked up cables all came back out onto the floor. EC wound up disassembling conduit at/near 3rd quarter bend, pulling the cables out into the hallway, then back up the rest of the run, then reassembling the conduit.
A pull box mid run would have saved a LOT of man-hours there. Straight shot, sure, 1000', dont need any boxes.
I was happy at that point in my career just to have 4 or less quarter bends in the conduit. I think 358.26 was the first code I learned by heart.