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How to figure conduit size #92728
04/05/05 08:27 AM
04/05/05 08:27 AM
B
Bill39  Offline OP
Member
Joined: Nov 2001
Posts: 75
Indianapolis, IN, USA
I need to figure the proper conduit size for a group of communication cables. These are 3 diffent size cables and I have the OD of each. There will be a mixture of each in several conduits.

Where in the NEC (or elsewhere)do I find this? In the old codebooks I thought there were examples but I'm having trouble finding it in the new one.

Thanks in advance for your replies.

2017 / 2014 NEC & Related Books and Study Guides
Re: How to figure conduit size #92729
04/05/05 09:56 AM
04/05/05 09:56 AM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
I'm looking at Chapter 9 Notes to Table 1 note #5 and I would calculate the area of your cables and abide by the percentages in Table 1.

Another item: Note #9 might impact on your measurements.

[This message has been edited by George Little (edited 04-05-2005).]


George Little
Re: How to figure conduit size #92730
04/05/05 11:03 AM
04/05/05 11:03 AM
Y
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 840
Michigan
ODxODx.7854 = sq. inch of cables.

Example Cad 5 =.215OD
.215 X .215 X .7854 = .0363051

#12 THHN OD = .111
.111 X .111 X .7854 = 0096769

When you got a mixture of Cables and only know ID use this then go to conduit fill charts.


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