Conduit Sleeve Fill

Status
Not open for further replies.
Shujinko

Shujinko

Senior Member
I have several 4" diameter x 14" long conduit sleeves feeding from a cable tray in a corridor to a telecom room. What is the conduit fill for this? Would I still have to go with Table 1 of Chapter 9 in the code or does note 4 of chapter 9 apply for 60% fill. In my opinion I would still have to go with Table 1 chapter 9. Is there anywhere else in the code that would allow me to go a higher conduit fill than what is stated in Table 1 Chapter 9?
 
Shujinko said:
Read note 5 of Chapter 9, isn't CAT 6 considered multi-conductor cable?
Click to expand...

See 800.110, last sentence:

"The raceway fill tables of Chapter 3 and Chapter 9 shall not apply".

That said, you probably dont want to jam 200 cat6 cables thru a 4" sleeve for firestopping requirements (if applicable).
 
Shujinko said:
I have several 4" diameter x 14" long conduit sleeves feeding from a cable tray in a corridor to a telecom room. What is the conduit fill for this? Would I still have to go with Table 1 of Chapter 9 in the code or does note 4 of chapter 9 apply for 60% fill. In my opinion I would still have to go with Table 1 chapter 9. Is there anywhere else in the code that would allow me to go a higher conduit fill than what is stated in Table 1 Chapter 9?
Click to expand...

If you plan on filling in excess of 60% fill, in my opinion, you are asking for trouble. For 3 wires, the packing factor is 65% if you fill them wall-to-wall. In general, larger counts of wires range from about 70% to 80% fill...again, if you fill them wall-to-wall. And you would have to be very meticulous in how you arrange the wires.

In general, the 60% fill limit by area represents about a 90% diametral fill. Attempting anything tighter is unrealistic.
 
Carultch said:
If you plan on filling in excess of 60% fill, in my opinion, you are asking for trouble. For 3 wires, the packing factor is 65% if you fill them wall-to-wall. In general, larger counts of wires range from about 70% to 80% fill...again, if you fill them wall-to-wall. And you would have to be very meticulous in how you arrange the wires.

In general, the 60% fill limit by area represents about a 90% diametral fill. Attempting anything tighter is unrealistic.
Click to expand...

Would using a fire rated path way such as a 4" Hilti Speed Sleeve or 4" EZ Path Fire Rated pathway buy me more room? They claim to be able to fit 210 CAT 6 cables in a 4" sleeve on their cut sheets. Is this blowing smoke or is it realisitic in the field when pulling cable?
 
Shujinko said:
Would using a fire rated path way such as a 4" Hilti Speed Sleeve or 4" EZ Path Fire Rated pathway buy me more room? They claim to be able to fit 210 CAT 6 cables in a 4" sleeve on their cut sheets. Is this blowing smoke or is it realisitic in the field when pulling cable?
Click to expand...

I'm not familiar with those products. My conduit sizer calculates a 5" PVC40 sleeve, with a 52% fill, assuming 0.25" OD cables.
 
Shujinko said:
Would using a fire rated path way such as a 4" Hilti Speed Sleeve or 4" EZ Path Fire Rated pathway buy me more room? They claim to be able to fit 210 CAT 6 cables in a 4" sleeve on their cut sheets. Is this blowing smoke or is it realisitic in the field when pulling cable?
Click to expand...

That's going to be tight. The above pic (ty) has ~130 cables ea in 3 sleeves, and 60 or so in the last. If they say 210 Im sure it's physically possible, but the last 40 or 50 arent going to be much fun to get thru.

We would have used the premade sleeves but at the time a 4" was over $100 each, and there was no way we were going to spend that kind of cash when a stick of 4" EMT, 8 bushings, a tube of FS1 and a putty brick ran about $60.
 
Status
Not open for further replies.
Top