Yes, it is possible to run multiple cables in the same conduit without subconduits or innerduct, although this practice tends to be more common in building environments than in outside plant construction. The biggest reason for using subconduits or innerduct is to avoid the risk of damaging existing plant when adding or removing cables later. This is not normally a major risk for FTTH deployments, since they aren't usually faced with...
a lot of moves, adds or changes in their fiber infrastructure.
The factors to consider are:
- The size of the cables
- The size of the conduit
- The length of the run
- The number of bends in the run
- The fiber installation technique (pulling, blowing, etc.), and
- Whether the cables will be installed individually or all at the same time.
The main issue is to never exceed the maximum pulling tension for the cable. This is particularly important for fiber. Pulling lubricants can help with this, along with increasing the size of the conduit. You should always consult with your cable's manufacturer to determine the maximum recommended tension for single and multiple cable pulls.
If you are primarily concerned with running multiple drop cables to a premise, however, this is rarely a problem. Drop cables -- especially the flat ones with dual strength members -- are very sturdy and the drop distances tend to be relatively short and straight. Another option you may wish to consider, depending on your application, is the use of higher fiber count drop or backbone cables to reduce the physical number of cables required.
Dig Deeper on Telecom Resources
Related Q&A from David Hashman
Waning interest in fiber to the home (FTTH) has led to mobile backhaul becoming the main driver of fiber deployment. Will this trend continue? Fiber ...continue reading
Fiber expert David Hashman breaks down the primary cost factors and typical equipment and outside plant expenses associated with deploying fiber to ...continue reading
Fiber expert David Hashman details the key design and other elements to consider when deciding whether to deploy a passive optical network (PON) or ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.