Air Compressor Wiring

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  #1  
Old 08-28-07, 08:32 PM
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Air Compressor Wiring

Installing a new compressor 230/1 and was wondering if the FLA is 16 and the Manufacturer is calling for a 30 amp breaker is it ok to use 12/2?
 
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  #2  
Old 08-28-07, 11:20 PM
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Exclamation

Nope. A 30 amp breaker must be matched up with at least 10 awg.
 
  #3  
Old 08-29-07, 01:59 AM
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Actually the answer is maybe. If the air compressor is hardwired to a single branch circuit then special rules apply. These rules are found in Article 430 of the NEC.

However, you cannot go wrong with the 30 ampere / # 10 wire rule.

This is also a moot point if the motor is cord & plug connected to a receptacle that could be used for some other purpose.
 
  #4  
Old 08-29-07, 08:53 AM
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The mimimum ampacity for conductors to a single motor is the Full-Load current X 125%.
You can select the conductor size based on this calculation.

Good Luck!!!!
 
  #5  
Old 08-29-07, 09:13 AM
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Smile

Guess I'll continue to start my few responses (even to the "seemingly" simple answers) with "I am a novice" (lol). I was certain however that I would place no-one in danger. Long live the pro's on this site. I learn sooo much everyday.
 
  #6  
Old 08-29-07, 11:46 AM
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Sidecutter,

If you're interesting in learning about breaker and conductor sizing for motor circuits, check out NEC article 430. Many of the standard sizing rules go out the window when it comes to dedicated motor circuits.

The viewer is a little clumsy, but you can view a free version of the codebook here:
http://www.nfpa.org/freecodes/free_access_document.asp?id=7005SB
 
  #7  
Old 08-29-07, 12:10 PM
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Ok i was going to go with a outlet and cord so I better stick to the 10 gauge
 
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