Art 440

[Ben Trueblood]

The nameplate on an air handler reads min. circuit ampacity 50A max 70A. The question is do I have to size the conductors according to the maximum or can I size them anywhere in the range between 50 and 70A. Please back up your reply with a code article.

 

[LarryFine]

Conductor at least MCA, and breaker (or fuses, if spec'ed) no larger than MOCP.

That means you can use #6 or #8 wire, depending on type, and a 70a breaker.

 

[A/A Fuel GTX]

The nameplate on an air handler reads min. circuit ampacity 50A max 70A. The question is do I have to size the conductors according to the maximum or can I size them anywhere in the range between 50 and 70A. Please back up your reply with a code article.

I would think that the 50A is the minimum circuit ampacity ( conductor size ) and the 70A is the maximum fuse size. Look at 430.52 since an air handler is a motor load. Size the conductors to a 50A load.

 

[Ben Trueblood]

What Article will back this up? It is better to know where in the code to find this.



Thanks

 

[augie47]

See if 440.32 will help. (also 440.4(C) )

 

[raider1]

What Article will back this up? It is better to know where in the code to find this.



Thanks

Check out 440.6, 440.22, 440.31, 440.32, 440.51, 440.52.

Chris

 

[A/A Fuel GTX]

Also 440.22, 440.31, Art 430 part IV