a/c unit

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normbac

Senior Member
If the mca on a A/C condensor is 25.4 amps can you round down to 25amps and use a #12 cu
or must you round up to 26 amps and be required to use a #10cu

Or not round anything and still be required to use #10cu
 
I don't see anything in 440.31 - 440.35 that says anything about rounding down, all the sections appear to state "not less than" (2005)
 
normbac said:
If the mca on a A/C condensor is 25.4 amps can you round down to 25amps and use a #12 cu
or must you round up to 26 amps and be required to use a #10cu

Or not round anything and still be required to use #10cu
Click to expand...
#12 is good for 30 amps in this case 240.4(g) unless you are using nm cable.

Oh and was that before of after some percentages
Click to expand...

The nameplate has 125% in it already
 
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I have to remember that, frankly I do recall that, I just don't have to...
Some things it can still be a (learning refresher). Being here... :roll:
 
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Dennis Alwon said:
#12 is good for 30 amps in this case 240.4(g) unless you are using nm cable.
The nameplate has 125% in it already
Click to expand...


#12 is only good for 25 amps even if you're using NM cable. You can't use the 30 amp rating since it's at 90 degrees C.
 
infinity said:
#12 is only good for 25 amps even if you're using NM cable. You can't use the 30 amp rating since it's at 90 degrees C.
Click to expand...

I stand corrected, of course you are right. Lord knows what I was thinking- going from memory- bad idea in my case. :D
 
Dennis Alwon said:
I stand corrected, of course you are right. Lord knows what I was thinking- going from memory- bad idea in my case. :D
Click to expand...

it only gets worse :grin:
 
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