Motors should be fused with a time-delay fuse rated 175% of the motor's full load ... 1/3 HP 5.6 AMP 15 AMP 505 FT 806 FT 1285 FT 2036 FT 3246 FT 5154 FT 781 FT 1237 FT 1968 FT 3134 FT Wire Size for a 7 1/2 HP 240Volt Air Compressor. Low voltage can cause the motor to fail. 1) can I use 12-3 romex . what wire size , type , and conduit size ,and amp breaker do I need . Please consult the National Electric Code (NEC) and any applicable local standards for exact requirements. what size wire do I need for 5 hp air compressor? Smith Century AC Motor, R56 Horizontal frame, 5 HP, 208-230 VAC, 22.0 Amp, kVA/HP Code G, S.F. I already have 220 to the box with 8 gage. Find the correct wire size for your pump. I know this topic has been covered before but the more information I get the more confused I am. Wire Size Awg No. And I have a double 20 amp breaker plus I will be about 4' … And the maximum breaker size (MOCP) is dictated by the following article from the 2017 NEC. I have a Ingersoll Rand air compressor it is a 5hp 230 volt 1 phase compressor I would like to run the power feeds to the compressor inside PVC conduit about 45' away from the service panel . Consider the following: On start up the compressor motor draws much more current than when the motor is up and running; The distance from the electrical panel to the outlet where the compressor is plugged in must be added to the overall wire length Thermal Magnetic Trip Rating: 80 Amps. I have a light industrial air compressor with a single phase, capacitor-start, capacitor-run, A.O. Minimum Copper Wire Size: #6 – (Wire Types THW, THHN, THWN are Rated at 65 Amps). voltage drops considerably, the wire size is too small. Also, what is the best way to wire between the pressure switch and the panel box when the compressor will be 10-15 feet away? Thanks Frank Please email answer to: Fmcmahon@co.dutchess.ny.us The charts below contain recommended minimum wire size (AWG) for different voltage, horsepower and cable length combinations. hello, I am wiring a 240v compressor with a 17 amp motor. Dual Element, Time Delay UL Class RK5 Fuse (Used with Properly Sized O/L Relay) Circuit Breaker (Instantaneous Trip Circuit Breaker) Continuous Amp Rating SINGLE PHASE UNITS ½ 115V 8.4 14 15A 15A ½ 208V / 230V 4.4 / 4.2 14 8A / 7A 7A ¾ 115V 11 12 15A 15A ¾ 208V/ 230V 5.5 / 5.4 14 12A / 10A 15A Jeff, from what you have described I have come up with the following: Based upon a 7 1/2 HP Motor, 240Volt, Single Phase: Full Load Current: 40 Amps. Hi, What size wire and breaker are needed for a 5Hp, 20Amp 230 V motor on an air compressor? These charts are only a guide. 1.15, Continuous duty rating, and the specification plate indicates it is a compressor duty motor. 2) I will wire it to the fuse box with a 20 amp breaker. 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