Please consult the National Electric Code (NEC) and any applicable local standards for exact requirements. 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 Minimum Copper Wire Size: #6 – (Wire Types THW, THHN, THWN are Rated at 65 Amps). 2) I will wire it to the fuse box with a 20 amp breaker. What size extension cord for an air compressor then? 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 The charts below contain recommended minimum wire size (AWG) for different voltage, horsepower and cable length combinations. Thermal Magnetic Trip Rating: 80 Amps. Wire Size for a 7 1/2 HP 240Volt Air Compressor. 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 what size wire do I need for 5 hp air compressor? I have a light industrial air compressor with a single phase, capacitor-start, capacitor-run, A.O. And the maximum breaker size (MOCP) is dictated by the following article from the 2017 NEC. 1) can I use 12-3 romex . 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? Wire Size Awg No. Hi, What size wire and breaker are needed for a 5Hp, 20Amp 230 V motor on an air compressor? Smith Century AC Motor, R56 Horizontal frame, 5 HP, 208-230 VAC, 22.0 Amp, kVA/HP Code G, S.F. hello, I am wiring a 240v compressor with a 17 amp motor. HP .5 HP .75 HP 1 HP 1.5 HP 2 HP 3 HP 5 HP Pump Wire Configuration 2 Wire 3 Wire Phase 1 ∅ 3 ∅ Site Voltage 115V 230V Clear filter Cross reference the distance from your pump to the electrical service entrance to determine the correct gauge. I already have 220 to the box with 8 gage. I know this topic has been covered before but the more information I get the more confused I am. These charts are only a guide. And I have a double 20 amp breaker plus I will be about 4' … what wire size , type , and conduit size ,and amp breaker do I need . 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. Low voltage can cause the motor to fail. 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 . 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