fiber pull conduit size

[MerlinsBeard]

So I have a future fiber pull that I want to do that's mostly 1" PVC conduit. However, for termination, I'm going through a california corner to get to the in wall enclosure. Can I get away with downsizing to 3/4" elbow to get through the corner and still have room to pull the fiber eye?

 

[Stuart in MN]

You need to find the bend radius of the fiber, it should be included in the specifications. Pulling it through a right angle bend is probably going to be difficult and will probably damage the cable.

 

[MerlinsBeard]

Sorry, I didn't mean to say 3/4" elbow, but a 3/4" PVC sweep. I'm more concerned if the pulling eye can handle the smaller diameter.

 

[Innovate1]

I think that is going to be tight. I was glad I put in 1" when I needed to pull fiber with terminations. Is this preterminated fiber? You are close enough I think you need to find out actual dimensions. BTW, I had a 1" LB and was able to meet minimum radius but putting a carved wood form that keeps eases the corner.

 

[rlitman]

You need to find the bend radius of the fiber, it should be included in the specifications. Pulling it through a right angle bend is probably going to be difficult and will probably damage the cable.

We need to know more about the fiber being pulled to answer. At work, I deal with stuff that just won't go in less than a 2" sweep.
I got gigabit FTTH run last year at home, and the 1/4" diameter fiber they brought in had no trouble being fed through a 3/4" LB and about 30' through a slightly zig-zaggy 3/4" smurf tube. I'd say it pulled like RG-59, though with a much tougher jacket.

For the record, while many cable assemblies have large bend radii, a single strand in most cases can be wrapped snuggly around your finger multiple times, or even make it most of the way bent around a pencil without issues.

 

[yatg]

So I have a future fiber pull that I want to do that's mostly 1" PVC conduit. However, for termination, I'm going through a california corner to get to the in wall enclosure. Can I get away with downsizing to 3/4" elbow to get through the corner and still have room to pull the fiber eye?

made me look that up, and i'm original from kommiefornia.
nothing to see here.

 

[Innovate1]

If you slope the conduit bend you can get a bigger size and radius in that corner. Or at the extreme go vertical. Transition to vertical in the corner and then back to horizontal in the other wall.

 

[MFortie]

I think that is going to be tight. I was glad I put in 1" when I needed to pull fiber with terminations. Is this preterminated fiber? You are close enough I think you need to find out actual dimensions. BTW, I had a 1" LB and was able to meet minimum radius but putting a carved wood form that keeps eases the corner.

FWIW, Southwire makes an approved LB for telecommunications cabling...

Called a SmartLB.

 

[MerlinsBeard]

I think that is going to be tight. I was glad I put in 1" when I needed to pull fiber with terminations. Is this preterminated fiber? You are close enough I think you need to find out actual dimensions. BTW, I had a 1" LB and was able to meet minimum radius but putting a carved wood form that keeps eases the corner.

I would like to pull pre-terminated fiber if I can manage it, but I could hire out someone to do terminations if need be.

I suppose I can order a small test cable and see how that goes before I order the really long fiber cable.

 

[MerlinsBeard]

We need to know more about the fiber being pulled to answer. At work, I deal with stuff that just won't go in less than a 2" sweep.
I got gigabit FTTH run last year at home, and the 1/4" diameter fiber they brought in had no trouble being fed through a 3/4" LB and about 30' through a slightly zig-zaggy 3/4" smurf tube. I'd say it pulled like RG-59, though with a much tougher jacket.

For the record, while many cable assemblies have large bend radii, a single strand in most cases can be wrapped snuggly around your finger multiple times, or even make it most of the way bent around a pencil without issues.

This is for home to "shed" connection. I could go 2 strand or perhaps 4 strand for a couple spares if I can figure out the conduit in the corner issue. The run has an outside underground conduit component so the jacket would probably be more rugged with a lower bend radius.

The run is 1" conduit basement (55-60') -> LB -> 1" conduit underground (about 40'), then LB into shed, with box on the interior wall, but then I need to go from the box through this stud corner to get to final termination enclosure where the network gear will live. I did have a cable in mind from fs.com, need to look it up at home to remember what I was looking at.

If you slope the conduit bend you can get a bigger size and radius in that corner. Or at the extreme go vertical. Transition to vertical in the corner and then back to horizontal in the other wall.

I'm trying to visualize and can't quite figure out what you mean. Can you ms paint it?. I am planning to use some scrap wood to make a replica of the corner and try it out first.

Appreciate the feedback.

 

[rlitman]

...
The run is 1" conduit basement (55-60') -> LB -> 1" conduit underground (about 40'), then LB into shed, with box on the interior wall, but then I need to go from the box through this stud corner to get to final termination enclosure where the network gear will live. I did have a cable in mind from fs.com, need to look it up at home to remember what I was looking at...

Still need to know more about the fiber you're looking at. Running fiber through an LB is generally not recommended, even with my own experiences as a counter example.

 

[Innovate1]

How about this? Easier to pencil sketch it than fool with paint... Put a vertical conduit right in the corner. Use a sweep at the bottom to go into one wall and another sweep at the top to go into the other wall. Easy if you have access. Is this new construction or retrofit?

 

[Innovate1]

Here's what I did for a 1" LB fiber guide where the conduit came up side of foundation and into rim joist. I have some better pics somewhere but this should give the basic idea. The left part of the L is the inside diameter of the conduit into the house. The right side is the LB body interior. The circle is the outline of the form to prevent the fiber from kinking on the sharp corner. I was thinking of 3d printing it but had to find someone else to do it so just hacked it out of some scrap wood.

 

[Innovate1]

I used 4 strands of fs.com 70220 with staggered terminations and had no problem going through 1" PVC conduit. I used long sweeps but standard ones are probably ok.

 

[Stuart in MN]

Note that if you use LB type conduit fittings, you need to maintain access to them (i.e. you can't bury a conduit body in a finished wall.)

 

[PCustoms]

Note that if you use LB type conduit fittings, you need to maintain access to them (i.e. you can't bury a conduit body in a finished wall.)

For electric

Pretty sure if you use it as a guide/chase for non electric applications it doesn't matter.

As for the OP, use one big enough for the connector to pass through. I was all worried about mine, then the installer came and told me just drill a 1/2" hole and pull in through everything.

 

[b-boy]

Spend some money on a good puller. I bought a cheap Chinese-made harness on ebay. I had a 200ft pull through 1" conduit with several 90s. It was a lot harder than I though it was going to be,

It got stuck 90% of the way and the puller just fell apart. I had to make my own from the parts I could salvage.

 

[MerlinsBeard]

How about this? Easier to pencil sketch it than fool with paint... Put a vertical conduit right in the corner. Use a sweep at the bottom to go into one wall and another sweep at the top to go into the other wall. Easy if you have access. Is this new construction or retrofit?

It is new construction, I have open access to the stud bays.

 

[wyliesdiesels]

For electric

Pretty sure if you use it as a guide/chase for non electric applications it doesn't matter.

As for the OP, use one big enough for the connector to pass through. I was all worried about mine, then the installer came and told me just drill a 1/2" hole and pull in through everything.

fiber optics are covered by the NEC and conduit must be installed by code...

 

[Innovate1]

Note that if you use LB type conduit fittings, you need to maintain access to them (i.e. you can't bury a conduit body in a finished wall.)

I don't see where anyone suggested covering an LB. The comments were just that where using one to come into a building it would be good to do something to ensure the needed radius. Doesn't make much sense to use an LB in the corner - the OPs original question.