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Motor Calculator

 

Motor Calculator

Based on tables in the 2011 NEC®
Select phase, then operating voltage and then horsepower.
Phase
Voltage
Horsepower
Full load current in amps (NEC)
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Minimum copper wire size (AWG or kcmil)
(75° C) THW, THHW, THWN, XHHW
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RM Conduit size - inches (metric designator)
- 3 phase, 3 wire THW, THW-2, THHW
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RM Conduit size - inches (metric designator)
- 3 phase, 3 wire THHN, THWN, XHHW,
THWN-2, XHHW-2
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RM Conduit size - inches (metric designator)
- 3 conductors Type MV-90 non-shielded
power cable
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  • Note: Single phase, 2 wire.
  • Tables used: 300.1(C), 310.15(B)(16) (formerly 310.16),
    310.60(C)(73) (5kV) (formerly 310.73), 430.248, 430.250,
    Annex C: Table C.8
  • Read and use all of the notes used with the tables in the NEC.
  • NEC, National Electrical Code, (NFPA 70) are registered
    Trademarks of NFPA.
 
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