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Cable Point of Entry #219010
01/10/18 01:55 PM
01/10/18 01:55 PM
libellis  Offline OP
New Member
Joined: Jan 2018
Posts: 2
New York
The National Electrical Code definition of Point of Entry for fiber optic cable (NEC 2014, Article 770.2) states:

"The point within a building at which optical fiber cable emerges from an external wall, from a concrete floor slab, from rigid metal conduit (RMC), or from intermediate metal conduit (IMC)."

My question is if a conduit run that contains metal pull boxes is used to create a distant Point of Entry within a building, is this still code compliant, or are pull boxes not allowed?

I would think that it would still be compliant, otherwise a long conduit run without pull boxes could be impractical, but I don’t know if a pull box would be considered as exposing the cable. Code prohibits non fire rated cable from running more than 50’ exposed from the Point of Entry.

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Re: Cable Point of Entry [Re: libellis] #219011
01/10/18 02:27 PM
01/10/18 02:27 PM
gfretwell  Offline

Joined: Jul 2004
Posts: 9,184
As a general rule you don't use the "definition" section to describe methods. That is just defining terms. Go down to section II in article 770 to read more about fiber entering buildings. (starting at 770.47)
If you look at raceways in Chapter 3 of the code you will see that boxes and conduit bodies are considered to be part of the raceway system if they are installed in the correct manner so that part of your question is "yes" they are allowed in that system.

Greg Fretwell
Re: Cable Point of Entry [Re: gfretwell] #219014
01/10/18 09:40 PM
01/10/18 09:40 PM
libellis  Offline OP
New Member
Joined: Jan 2018
Posts: 2
New York
Much appreciated - that answer was right on target.

Article 770.48 was the motivation for my asking the question, but I didn't think of the Chapter 3 information regarding raceway components that you pointed out. Thanks.


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