Overfilled conduit!
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Posted by TJ on March 28, 2007, 2:21 am
Please log in for more thread options Hi Guys, I have been called in to run 33 CAT6 cables through a customer supplied 2" PVC conduit. To top it off the run is a 2 story vertical drop. I know the conduit will be grossly overfilled according to the fill charts. But I guess my question is-- What is the ramification of an over filled conduit, and what problems am I looking at regarding the long vertical drop? I know the solution. More chases or less cables. But the client is going to ask "why"? The cables will carry a mix of voice and data. and maybe even a couple of POE AP's. My guess is at least a third of the cables will go unused. What should I do? Thanks TJ | |||||||||||||||||||||||||
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Posted by Doug McIntyre on March 28, 2007, 1:48 pm
Please log in for more thread options >I know the solution. More chases or less cables. But the client is going to
>ask "why"? >The cables will carry a mix of voice and data. and maybe even a couple of
>POE AP's. My guess is at least a third of the cables will go unused. >What should I do?
Get a disclaimer that any cable runs ruined by trying to overstuff the conduit isn't your fault, and they'll have to pay again for more copper after figuring out which ones survive the journey? | |||||||||||||||||||||||||
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Posted by Phil Partridge on March 28, 2007, 1:57 pm
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writes >Hi Guys,
Put another cabinet in at the 'remote' end..
> >I have been called in to run 33 CAT6 cables through a customer supplied 2" >PVC conduit. To top it off the run is a 2 story vertical drop. I know the >conduit will be grossly overfilled according to the fill charts. But I guess >my question is-- What is the ramification of an over filled conduit, and >what problems am I looking at regarding the long vertical drop? > >I know the solution. More chases or less cables. But the client is going to >ask "why"? > >The cables will carry a mix of voice and data. and maybe even a couple of >POE AP's. My guess is at least a third of the cables will go unused. > >What should I do? > >Thanks > >TJ > > Multicore between two patch panels for phones. Couple of CAT6 for data, and a remote switch.. Maybe fibre if they will run to it? Oh, and see if you can break into the duct halfway to add some mechanical strain relief. HTH, Philip Partridge | |||||||||||||||||||||||||
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Posted by Robert Redelmeier on March 28, 2007, 5:30 pm
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> I have been called in to run 33 CAT6 cables through a customer
> supplied 2" PVC conduit. To top it off the run is a 2 story > vertical drop. I know the conduit will be grossly overfilled > according to the fill charts. But I guess my question is-- What does the fire marshall/inspector think? > What is the ramification of an over filled conduit, and what
> problems am I looking at regarding the long vertical drop? Horrible, and many. An overfilled conduit cannot be pulled or later reused. You have to cut it up and throw it away. One intractible problem is weight -- supporting the cable dropping 25' without overtension or tight bend radius. It might barely be possible to do this pull in one go iff the conduit is straight (no elbows) from inlet box to outlet box. You will need nice cable hangers at the inlet end. -- Robert | |||||||||||||||||||||||||
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Posted by Carl Navarro on March 28, 2007, 7:33 pm
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>Hi Guys,
> >I have been called in to run 33 CAT6 cables through a customer supplied 2" >PVC conduit. To top it off the run is a 2 story vertical drop. I know the >conduit will be grossly overfilled according to the fill charts. But I guess >my question is-- What is the ramification of an over filled conduit, and >what problems am I looking at regarding the long vertical drop? I read this twice. 2 stories? TWENTY FEET? WTP? The same can be said about those 2 sticks of PVC, and elbow, and hangars. Don't argue over $60 worth of material, just insist that he add a 3" backup tube because it's not much more than the first tiny one he ran, and because you can't maintain the data integrity in a packed tube. Carl Navarro | |||||||||||||||||||||||||
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>PVC conduit. To top it off the run is a 2 story vertical drop. I know the
>conduit will be grossly overfilled according to the fill charts. But I guess
>my question is-- What is the ramification of an over filled conduit, and
>what problems am I looking at regarding the long vertical drop?