NCElectrician
Member
When is #14,#12 good for ampacity of their actual value found in 310-16?
#12 good for 30 amps
- Thread starter NCElectrician
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- New Jersey
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- Journeyman Electrician
When it's terminations are rated for 90? C and other restrictions do not apply. You can also use it for derating.
Welcome to the Forum.
Welcome to the Forum.
Gategator37
Senior Member
derating...................
Welcome to the Forum...
if I may add to my learned colleague's comments...
The post Title referred to "30 amps", the body to "actual value".
They covered the 30 amp rating, but, you might want to note that 240.4(D) which reference 240.4(E) & (G) and allows you to use the 75? rating (20 amps for 14, 25 for 12) in certain specific applications.
if I may add to my learned colleague's comments...
The post Title referred to "30 amps", the body to "actual value".
They covered the 30 amp rating, but, you might want to note that 240.4(D) which reference 240.4(E) & (G) and allows you to use the 75? rating (20 amps for 14, 25 for 12) in certain specific applications.
NCElectrician
Member
This is its rating in the 60 c chart.?
NCElectrician
Member
If I remember correctly, I think you can use these values for motors. For example heat pumps or AC units.
Gategator37
Senior Member
Could this also apply to tap conductors?
430.72(B) table '08 code
jetlag
Senior Member
- Location
- Eatonton, Georgia
We do it all the time for motor start loads but we may not realize it :grin:
- Location
- Chapel Hill, NC
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- Retired Electrical Contractor
That is correct. As Roger stated 240.4 (G) allows you to use the actually value for a/c, motors etc. 240.4(D) is what restricts us and (G) states where it is okay to use the actual values. Thus #12 is good for 25 amps for all those items in 240.4(G).
jetlag
Senior Member
- Location
- Eatonton, Georgia
We are allowed to do this because motor loads are better protected than normal branch circuits because of motor overload devices .
Minuteman
Senior Member
- Location
- The Sooner Nation
In other words. For the loads listed in 240.4 (G), you can install a conductor that is rated to carry the minimum ampacity required per the nameplate, and set the ocd at the maximum required per the nameplate.
Example: 2 ton A/C condenser nameplate
Min Amps: 19
Max Amps: 25
Install a #12 with a 25 Amp breaker.
Example: 2 ton A/C condenser nameplate
Min Amps: 19
Max Amps: 25
Install a #12 with a 25 Amp breaker.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Yes, but you could also use #12 for a min. cir. ampacity of 24 and still be compliant.
Minuteman
Senior Member
- Location
- The Sooner Nation
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
240.4(G) will lead one to 440.6, which permits this type of usage.
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