Sizing a trough

[jonny1982]

If a transformer is feeding an 800 amp disconnect out of the secondary side and I wanted to use a trough for this, what is the smallest size I can use? It is (2) sets of 600 mcm, (8) 600's total. Was going to use (2) 4" greenfields, but think trough would be easier.

Thanks

 

[infinity]

For a wireway you're allowed up to 20% fill, for example a 6x6 wireway will give you 7.2 square inches (6*6*20%), a 4x4 gives 3.2 square inches, etc. Look up the cross-sectional area of your conductors and see what fits.

 

[LarryFine]

For a wireway you're allowed up to 20% fill, for example a 6x6 wireway will give you 7.2 cubic inches (6*6*20%), a 4x4 gives 3.2 cubic inches, etc. Look up the cross-sectional area of your conductors and see what fits.

Actually, square inches of cross-sectional area, not cubic inches of volume, but who's counting?

 

[jonny1982]

For a wireway you're allowed up to 20% fill, for example a 6x6 wireway will give you 7.2 cubic inches (6*6*20%), a 4x4 gives 3.2 cubic inches, etc. Look up the cross-sectional area of your conductors and see what fits.

So a 10 X 10 gives me 20 square inches. 600 MCM is 1.2135 inches squared. 1.2135 X 8 is 9.708 which tells me a 10 X 10 would be more than enough. Did I do that correctly? Also, isn't there something about the bending radius of the conductors as well?

Thanks

 

[infinity]

Actually, square inches of cross-sectional area, not cubic inches of volume, but who's counting?

Opps yes your correct it's the cross sectional area. :ashamed1:

I made the correction in my earlier post, thanks for pointing that out.