tbischoff9
New User
- Location
- Ogden, Utah, USA
I had a test question which said "[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]How many # 750 THHN Copper conductors fit in a 5” PVC Sch 80 conduit?"[/FONT]
[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]If I were to use Annex C10 it says that I could fit 7 750kcmil THHN conductors in a 5" PVC Schedule 80[/FONT]
[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]If I were to use Chapter 9 of the code it says that a 750 kcmil fills 677.2 mm^2 (1.0496 in^2) per conductor and that a 5" PVC Schedule 80 conduit has a max fill for more than 2 wires of 4607 mm^2 (7.142 in^2)[/FONT]
[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]According to the math I can fit 6.8 wires in the conduit which would mean that I would have to go down to 6 wires in that 5" PVC conduit
Why is there a discrepancy between the math that is calculated in Chapter 9 Tables 4 and 5 and Annex C10?
Both 6 and 7 were possible answers on the multiple choice test, which of the two answers would be the most correct and why?[/FONT]
[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]If I were to use Annex C10 it says that I could fit 7 750kcmil THHN conductors in a 5" PVC Schedule 80[/FONT]
[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]If I were to use Chapter 9 of the code it says that a 750 kcmil fills 677.2 mm^2 (1.0496 in^2) per conductor and that a 5" PVC Schedule 80 conduit has a max fill for more than 2 wires of 4607 mm^2 (7.142 in^2)[/FONT]
[FONT=LatoWeb, Helvetica Neue, Helvetica, Arial, sans-serif]According to the math I can fit 6.8 wires in the conduit which would mean that I would have to go down to 6 wires in that 5" PVC conduit
Why is there a discrepancy between the math that is calculated in Chapter 9 Tables 4 and 5 and Annex C10?
Both 6 and 7 were possible answers on the multiple choice test, which of the two answers would be the most correct and why?[/FONT]