Bend radius for Fiber cables ( 2 Fiber Multimode 62.5/125mm)

[transman2]

Is it legal to install 6 fiber cables ( 2 Fiber Multimode 62.5/125mm) in a 2" LB68 with a bending radius of 4.4 inches. Cable diameter is .3. So if I use a factor of 10 x .3 that should be a 3 inch bending radius however I have 6 cables so does that change the outcome.

 

[Hv&Lv]

Most manufacturers recommend 20 times diameter under tension and 10 times diameter when not under tension.

FOA Guide To Fiber Optics - Table of Contents

Fiber broadband technical resources from the Fiber Optic Association

www.thefoa.org

 

[hbiss]

Is it legal...

The NEC has nothing to say about it.

-Hal

 

[tom baker]

The NEC has nothing to say about it.

-Hal

Yes, the purpose of the NEC is protection against electric shock and fire. Having your fiber working is beyond its scope.
I have done a lot of fiber installations, I had a 3 ring binder with data sheets on cable, patch panels, connectors, for reference on cable bending. There is a type of newer fiber called bend tolerant, but I hadn’t used it.
on your application, if it’s a short run, and you have enough headroom, ie what is your loss budget, you may be ok.
Could you use a deep NEMA junction box Instead of the LB?