15HP motor conductor sizing
- Thread starter trallio
- Start date
- Status
resistance
Senior Member
- Location
- WA
Not enough information.
-3 ph or 1 PH?
-As Celtic ask, duty cycle.............?
-What is this motor being used for?
-Is a fire pump involved?
-3 ph or 1 PH?
-As Celtic ask, duty cycle.............?
-What is this motor being used for?
-Is a fire pump involved?
QES
Senior Member
- Location
- California
15hp (3phase) will have a 21FLA and require a #10 wires ( 75c)
Last edited:
- Location
- Illinois
- Occupation
- retired electrician
Celtic,
Don
That would be a rare motor...that table is for two phase 4 wire motors, however if you did have that motor the code would not permit the use of #14 unless the terminations and equipment were listed for use at 90?C. 1.25 x 18 = 22.5A.
Don
jrclen
Senior Member
- Location
- Central Wisconsin
I agree with QES using table 430.250, 430.22A, and table 310.16 75c.
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The point of my answer is that is not enough information was given.
We can speculate as to what the OP is actually asking...but we won't know for sure until he offers more.
We can speculate as to what the OP is actually asking...but we won't know for sure until he offers more.
celtic said:
jrclen
Senior Member
- Location
- Central Wisconsin
celtic said:
And you are correct of course.
cadpoint
Senior Member
- Location
- Durham, NC
- Occupation
- Electrician - but not by NC Law.
I've done shot a flair, I've learned the Code Wrong!
I've done shot a flair, I've learned the Code Wrong!
Now Im using 2005 -NFPA.
Now I'm trying to play along here at home, I ususally go right to the stated article(s). where's 430.149 - table article or other.????
Maybe its 430.249! ?
If one starts in the beginning of article 430, 430.149 isn't listed in Figure 430.1 Article 430 Contents. Theres no grey shading in Fig. 430.1 in 2008. Back to the question and based on Figure 430.1, Motor circuit conductors lies with 430.21 through 430.29.
Now I know where all in various degrees of Code applications in the forum, I just wish the questioner/OP would state where they are in respect to there code cycle. Theres very little grey up to the point of, you guessed it 430.126- 08'
This all tells me two things about the way people solve or answer a problem here. They do it based on learned behavior including the part I've done it this way forever, and negate what is being asked. Or they do it this way based on researching the answer based on the quantity or value of the question, as said theres not enough information!
I really need to get out more if you guys are hooking up 480 Two-Phase
Alternating-Current Motors (4-Wire).:grin:
I've done shot a flair, I've learned the Code Wrong!
trallio said:
celtic said:
Now Im using 2005 -NFPA.
Now I'm trying to play along here at home, I ususally go right to the stated article(s). where's 430.149 - table article or other.????
Maybe its 430.249! ?
If one starts in the beginning of article 430, 430.149 isn't listed in Figure 430.1 Article 430 Contents. Theres no grey shading in Fig. 430.1 in 2008. Back to the question and based on Figure 430.1, Motor circuit conductors lies with 430.21 through 430.29.
Now I know where all in various degrees of Code applications in the forum, I just wish the questioner/OP would state where they are in respect to there code cycle. Theres very little grey up to the point of, you guessed it 430.126- 08'
This all tells me two things about the way people solve or answer a problem here. They do it based on learned behavior including the part I've done it this way forever, and negate what is being asked. Or they do it this way based on researching the answer based on the quantity or value of the question, as said theres not enough information!
I really need to get out more if you guys are hooking up 480 Two-Phase
Alternating-Current Motors (4-Wire).:grin:
More info
More info
The motor will be a standard 460V, 3ph
It is for a fan in some HVAC equipment at a power plant.
There is no magic to this thing that I know of except that some PLC programmer who is technically an electrical engineer is claiming that #12's are enough. As he is a customer, we agreed to "investigate" but told him that we believed that #10's are the proper size for a 15hp motor- especially in an industrial envrionment.
The one modifier is that the distance is in excess of 300'. But I didn't want to confuse voltage drop with the heart of the question.
Sorry about the long time between replies. holidays...
More info
The motor will be a standard 460V, 3ph
It is for a fan in some HVAC equipment at a power plant.
There is no magic to this thing that I know of except that some PLC programmer who is technically an electrical engineer is claiming that #12's are enough. As he is a customer, we agreed to "investigate" but told him that we believed that #10's are the proper size for a 15hp motor- especially in an industrial envrionment.
The one modifier is that the distance is in excess of 300'. But I didn't want to confuse voltage drop with the heart of the question.
Sorry about the long time between replies. holidays...
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