cross-sectional area of conductors

[guschash]

Where in chapter 9 Tables would I find cross-sectional area for conductors. I need to know the cross-sectional area of #12 and #10.

Thanks gus

 

[charlie b]

Try Table 5.

 

[guschash]

ok thanks

 

[ggunn]

Where in chapter 9 Tables would I find cross-sectional area for conductors. I need to know the cross-sectional area of #12 and #10.

Thanks gus

It depends on what you need the numbers for. If it's for conduit fill, then it's Table 5. If it's for anything to do with current carrying capability, then it's Table 8. The difference is that Table 8 doesn't include the insulation while Table 5 does.

 

[Carultch]

It depends on what you need the numbers for. If it's for conduit fill, then it's Table 5. If it's for anything to do with current carrying capability, then it's Table 8. The difference is that Table 8 doesn't include the insulation while Table 5 does.

Chapter 9 Table 8 has nothing to do with current carrying capacity. It will give you the kcmil and conductive core sizes of each wire, and it will give you the resistance per unit length for your voltage drop calculations. 310.15(B)(16) is the table to use for most current-carrying capacity calculations.

Table 5 includes the insulation in the sizes it specifies, which is useful for conduit fill calculations. Manufacturers may specify slightly smaller diameters for any given insulation type and wire size. Table 5 specifies worst case scenario industry wide, for each type of insulation.

 

[Johnnybob]

Since you didn't specify insulation type, chapter 9 table 8!

 

[ggunn]

Chapter 9 Table 8 has nothing to do with current carrying capacity.

Cross sectional area of the metal in a conductor has very much to do with current carrying capacity. I did not mean that you use Table 8 to determine current carrying capacity, only that the cross sectional areas shown there are what you use if, for example, you are calculating how much to size up a grounding conductor when you have sized up your CCC's for voltage drop. If you use the cross sectional areas in Table 5, which include the insulation, your calculation will be incorrect. Conversely, if you use the numbers in Table 8 when you are calculating, for example, conduit fill, you'll get it wrong then as well.