Flex conduit

[Alwayslearningelec]

Have customer wanting flex conduit(did not describe type yet) run underground for temporary application. About 500'. It's going to contain fiber cables. Should flex be run underground even if it only has fiber and is temporary? Thanks

 

[infinity]

You would need to use a fiber that was listed for direct burial since the FMC is just a sleeve. Not sure why you would use FMC it seems like a dumb choice when you could something like an armored direct burial cable.

 

[roger]

Tell the customer they should use use innerduct

 

[SceneryDriver]

Liquidtite (LFMC or LFNC) are suitable for direct burial of so marked and most are.


SceneryDriver

 

[infinity]

Tell the customer they should use use innerduct

IMO that would be the best choice. Direct burial innerduct typically bright orange so it's highly visible. Also it's smooth so pulling the fiber through it shouldn't be a problem. Pulling fiber through 500' of FMC might not be that easy.

 

[tom baker]

The inner duct is stiffer and will have less “wiggles” than LTNMC. It would be very challenging to run LTMNC straight

 

[kwired]

The inner duct is stiffer and will have less “wiggles” than LTNMC. It would be very challenging to run LTMNC straight

Even if not using innerduct, I'd go with rigid PVC before any flexible conduit. First it will pull easier mostly because of the less wiggles. Second it will cost less.

 

[don_resqcapt19]

You can get the duct with the fiber preinstalled too.

Fiber in Conduit Archives - Optical Cable Corporation

www.occfiber.com

 

[SceneryDriver]

IMO that would be the best choice. Direct burial innerduct typically bright orange so it's highly visible. Also it's smooth so pulling the fiber through it shouldn't be a problem. Pulling fiber through 500' of FMC might not be that easy.

This is the best choice. I have pulled through buried LFNC and it sucks, even when using wire lube. I mentioned that you can bury Liquidtite - I never said it was a good idea


SceneryDriver

 

[electrofelon]

This is the best choice. I have pulled through buried LFNC and it sucks, even when using wire lube. I mentioned that you can bury Liquidtite - I never said it was a good idea


SceneryDriver

I hate LFMC with a passion. I mean could they have chosen a material with a higher coefficient of friction???

 

[kwired]

I hate LFMC with a passion. I mean could they have chosen a material with a higher coefficient of friction???

If you stretch it really tight and straight it isn't nearly as bad.

ENT is same way. With corrugated interior some say it should pull easier than rigid PVC because of less surface contact - probably true but only if you get it really straight