#### CSoliz

##### Member

- Location
- Riverside, CA

Thanks

- Thread starter CSoliz
- Start date

- Location
- Riverside, CA

Thanks

From Table 5 (pg 677 in '08), 750 kcmil (assuming THHW) has a diameter of 1.1652 sq in, 500 THWN is .7901 sq in

1.1652 x 8 = 9.3216

,7901 x 2 1.5802

Total: 10.9018

If I did the math correctly, you are well within the limit.

- Location
- Fort Collins, Colorado

Assuming they go straight through and are THHN it would appear you have plenty of room, but I suspect there are some details here like not straight through, splices, bending space, etc that you did not share that would change everything.

Thanks

750 THHN area =1.0496X8=8.3968

500 THHN area=.70073X2=1.4146

Total area of conductors=9.81

Wireway 16X12=192 CuInX20% allowable=38.4

Must be more to the story.

- Location
- Fort Collins, Colorado

Didn't mean to step on/duplicate Augi....you must of posted wile I was calculating.

- Location
- Simi Valley, CA

I did the math in my head and got what Augie and Texie got.:roll:No problem, I just glad we came up with the "same" answer (taking insulation into account)

Are you sure he's looking for wire fill and not for the size of the box (6x or 8x)?

- Location
- Fort Collins, Colorado

Man, you're good. Do you also have the tables memorized so you don't have to look for just the right table?I did the math in my head and got what Augie and Texie got.:roll:

Are you sure he's looking for wire fill and not for the size of the box (6x or 8x)?

Augie had it calculated and posted before I even got to the right page. I must be getting feeble, as I just realized I wrote cubic inch and not square inch. I guess I got a pass as nobody flamed me.

Kidding aside, you may have a point about 6X or 8X as I think there is more to this than we now know.

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- Location
- Simi Valley, CA

I have every word in the NEC memorized. I don't have them memorized in the same order that they're in the book, but.....:lol:Man, you're good. Do you also have the tables memorized so you don't have to look for just the right table?

Augie had it calculated and posted before I even got to the right page. I must be getting feeble, as I just realized I wrote cubic inch and not square inch. I guess I got a pass as nobody flamed me.

Kidding aside, you may have a point about 6X or 8X as I think there is more to this than we now know.