am i doing this right?

[laketime]

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?

 

[augie47]

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)

 

[laketime]

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)

Duh:roll: your right I was using bare conductor sizing. Thanks for the help.

 

[jmellc]

Duh:roll: your right I was using bare conductor sizing. Thanks for the help.

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?

 

[laketime]

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

 

[Dennis Alwon]

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

Calculation must be made with 240V not 220V. Then it depends on your wiring method-

 

[laketime]

So then it is

I= 10,000/240

I= 41.66 amps

#8 wire

Wiring method is EMT.

 

[augie47]

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.

 

[laketime]

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.

Specs says it has a 45amp main breaker on the generator.

 

[augie47]

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.

 

[laketime]

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.

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:.

 

[augie47]

The Forum is a good sounding board,