Sleeve fill

[george t. everett]

Section 373-5(5) of the 99 code allows NMB cables to be sleeved into a panel . It states that " where installed as conduit or tubing, the allowable cable fill does not exceed that permitted for complete conduit or tubing systems by table 1 of chapter 9 of this code, and applicable notes thereto." My question is how do you determine the cross section of NMB cable?

 

[stamcon]

Re: Sleeve fill

George, look at the first page of Chapter 9 - Notes to tables(9).
"A multiconductor cable of two or more conductors shall be treated as a single conductor for calculating percentage conduit fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter".