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Chassis wiring vs. power transmission



 
 
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  #1  
Old July 30th 09, 05:41 AM posted to alt.home.repair
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Posts: 350
Default Chassis wiring vs. power transmission

I'm learning to interpret the table here (about 1/3 of the way down):

http://www.powerstream.com/Wire_Size.htm

What are examples "Chassis wiring" and what is "power transmission"?

My specific situation: I have a 70 foot run of 10/3 wire to a subpanel
inside my house. How many amps can I have on that subpanel?

Thanks,

Aaron
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  #2  
Old July 30th 09, 06:31 AM posted to alt.home.repair
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Posts: 5,054
Default Chassis wiring vs. power transmission

In article ,
Aaron Fude wrote:

I'm learning to interpret the table here (about 1/3 of the way down):

http://www.powerstream.com/Wire_Size.htm

What are examples "Chassis wiring" and what is "power transmission"?

My specific situation: I have a 70 foot run of 10/3 wire to a subpanel
inside my house. How many amps can I have on that subpanel?

Thanks,

Aaron


Chassis wiring is *short* lengths of wiring inside a machine. I use 16
gauge in an industrial food processor that draws about 15 amps. That's
well under the chassis wiring limit, but far more than you could draw
through house wiring. It's all about ohms per foot.
  #3  
Old July 30th 09, 07:15 AM posted to alt.home.repair
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Posts: 350
Default Chassis wiring vs. power transmission

Smitty Two wrote:
In article ,
Aaron Fude wrote:

I'm learning to interpret the table here (about 1/3 of the way down):

http://www.powerstream.com/Wire_Size.htm

What are examples "Chassis wiring" and what is "power transmission"?

My specific situation: I have a 70 foot run of 10/3 wire to a subpanel
inside my house. How many amps can I have on that subpanel?

Thanks,

Aaron


Chassis wiring is *short* lengths of wiring inside a machine. I use 16
gauge in an industrial food processor that draws about 15 amps. That's
well under the chassis wiring limit, but far more than you could draw
through house wiring. It's all about ohms per foot.


So then the table tells me that I can only have 15amps in my subpanel.
That can't be right.
  #4  
Old July 30th 09, 07:15 AM posted to alt.home.repair
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Posts: 350
Default Chassis wiring vs. power transmission

Smitty Two wrote:
In article ,
Aaron Fude wrote:

I'm learning to interpret the table here (about 1/3 of the way down):

http://www.powerstream.com/Wire_Size.htm

What are examples "Chassis wiring" and what is "power transmission"?

My specific situation: I have a 70 foot run of 10/3 wire to a subpanel
inside my house. How many amps can I have on that subpanel?

Thanks,

Aaron


Chassis wiring is *short* lengths of wiring inside a machine. I use 16
gauge in an industrial food processor that draws about 15 amps. That's
well under the chassis wiring limit, but far more than you could draw
through house wiring. It's all about ohms per foot.


Thanks for your insightful response, BTW.
  #5  
Old July 30th 09, 07:26 AM posted to alt.home.repair
dpb
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Posts: 10,568
Default Chassis wiring vs. power transmission

Aaron Fude wrote:
....
So then the table tells me that I can only have 15amps in my subpanel.
That can't be right.


At =2% voltage drop @120V, yes...240V is 30A @75 ft which would be the
subpanel supply voltage I would presume.

--
  #6  
Old July 30th 09, 07:40 AM posted to alt.home.repair
external usenet poster
 
Posts: 5,054
Default Chassis wiring vs. power transmission

In article ,
Aaron Fude wrote:

Smitty Two wrote:
In article ,
Aaron Fude wrote:

I'm learning to interpret the table here (about 1/3 of the way down):

http://www.powerstream.com/Wire_Size.htm

What are examples "Chassis wiring" and what is "power transmission"?

My specific situation: I have a 70 foot run of 10/3 wire to a subpanel
inside my house. How many amps can I have on that subpanel?

Thanks,

Aaron


Chassis wiring is *short* lengths of wiring inside a machine. I use 16
gauge in an industrial food processor that draws about 15 amps. That's
well under the chassis wiring limit, but far more than you could draw
through house wiring. It's all about ohms per foot.


So then the table tells me that I can only have 15amps in my subpanel.
That can't be right.


From the notes accompanying that table:

"The Maximum Amps for Power Transmission uses the 700 circular mils per
amp rule, which is very very conservative."

"NOTE: For installations that need to conform to the National
Electrical Code, you must use their guidelines."

DAGS "NEC wire ampacities" or similar for links to other tables, or wait
for the resident a.h.r. code junkies for further info, but yes, I'm
pretty sure you can pull more than 15 amps through 10 AWG wire.
  #7  
Old July 30th 09, 06:28 PM posted to alt.home.repair
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Posts: 634
Default Chassis wiring vs. power transmission

On 2009-07-30, Aaron Fude wrote:

My specific situation: I have a 70 foot run of 10/3 wire to a
subpanel inside my house. How many amps can I have on that subpanel?


NEC 2008 section 240.4(D):

(D) Small Conductors. Unless specifically permitted in 240.4(E) or
(G), the overcurrent protection shall not exceed that required by
(D)(1) through (D)(7) after any correction factors for ambient
temperature and number of conductors have been applied.

[ . . .]

(7) 10 AWG Copper. 30 amperes

Cheers, Wayne
 




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