5 hp 80 gal 208/230 volt air compressor, amps 18.6-17.5, LR amps -95, KW- 2.98 Located 80-100 feet from panel--looking for wire size and breaker size thanks John
on 230V circuit hp listed on tank is 4.7 no FLA
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Are you on 230/240V (common) or 208V (rarer, unless you're in NYC)? Also, are you putting a cord on the air compressor, or hardwiring it to the wall?– ThreePhaseEelJan 26, 2021 at 22:58
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Is the 2.98 KW part of the compressor or a separate dryer unit? Any installation instructions?– JACKJan 26, 2021 at 23:08
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@jack 2.98kw will be the motor wattage true. Or closer to 4hp this is typical with vacuum cleaners and air compressors to lie about horsepower.– Ed BealJan 26, 2021 at 23:23
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@EdBeal OK. I thought it was a dryer for the air compressor. Some of the factories I worked in had them,– JACKJan 26, 2021 at 23:26
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230/240 V, in Arizona, HP advertised on tank is 4.7(ha,ha)– john zimmermannJan 27, 2021 at 18:37
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1 Answer
Do they provide the FLA? Air compressor vendors lie about horse power!!! Going by code we would use the fla book value 5hp or 28 amps plus 125% because it is a motor load or 35 amps requiring a 35 but probably a 40 amp breaker and #8 wire.
In reality your fla is probably going to be closer to 13 amps ( 2.98kw /240v) and that will be fine on a 12 awg circuit with a 20 amp circuit breaker.
Why do I say air compressor (and vacuum cleaner) companies lie? With locked rotor no work is being done and the definition of 1 horse power is the work of 746w. They put the LR value and at locked rotor no work is done.
