I have an overhead crane that I need to run a 460 volt 3 phase circuit to. After doing the amperage calculations and coming up with 46.375 amps ( # 8 thhn in the 75 degree column) I got an actual picture of the crane nameplate showing a required circuit ampacity of 115 amps. With the value of 115 amps, do I need to multiply 115 by 1.25 getting 143.75 amps needing # 1/0 wire or go just with the name plate rating of 115 amps and # 2 wire ? (all amperages from the 75 degree column).
Conductor ampacity for overhead crane circuit.
- Thread starter steve61
- Start date
- Location
- Illinois
- Occupation
- retired electrician
I think you need to know how the nameplate required ampacity was calculated. The 125% may already be included like it is for the AC minimum circuit ampacity.
Elect117
Senior Member
- Location
- California
- Occupation
- Engineer E.E. P.E.
See 610.14. I don't think it is that simple.
The nameplate rating at 100% but the wire size might require you to have the duty rating.
Is this just the feeder circuit to a industrial control panel (409.20) or is this to the crane itself?
The nameplate rating at 100% but the wire size might require you to have the duty rating.
Is this just the feeder circuit to a industrial control panel (409.20) or is this to the crane itself?