am i doing this right?

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laketime

laketime

Senior Member
I am figuring out wire fill of different sizes for EMT.
3/4" EMT @40% fill is 137mm2
(3) #6thhn - 13.30mm2 x 3 = 39.9mm2
(1) #10 thhn- 5.261mm2 = 5.261mm2
(6) #12 thhn- 3.31mm2 x 6 = 19.86

That totals 65.021mm2 of wire. That legally fits in a 3/4" EMT correct?
 
It appears you got your wire dimmensions from table 8... thats bare conductors.. for your THHN go back to Table 5, pg 678 ('08)
(I think your total will be .253 = over fill)
 
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augie47 said:
It appears you got your wire dimensions from table 8... thats bare conductors.. for your THHN go back to Table 5, pg 678 ('08)
(I think your total will be .253 = over fill)
Click to expand...

Duh:roll: your right I was using bare conductor sizing. Thanks for the help.
 
laketime said:
Duh:roll: your right I was using bare conductor sizing. Thanks for the help.
Click to expand...
Well, who says they have to be insulated? If you can figure out a way to keep the wires from touching each other, the conduit, the boxes or the panel, what's the problem?
 
The how about this one. The wire for a 10kW back up generator?

I=P/E

I=10,000/220

I=45.45amps

wire size #8awg thhn
 
You might find your 10kw generator has main lager than 40 amp... if so you would need to adjust your wire size for the OCP.
 
Then, IMO, a #8 (THWN) would be fine if your terminations are rated at 75? (110.14). In a NM or SE you would need a #6.
 
augie47 said:
Then, IMO, a #8 (THWN) would be fine if your terminations are rated at 75? (110.14). In a NM or SE you would need a #6.
Click to expand...

Thanks for your help. I have 20 years of experience in commercial electrical but we always ran the projects off of fully engineered drawings. Mistakes were found on the drawings sometimes and we could correct that. Now that I am out on my own sometimes I feel like a total rookie again :roll:.
 
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