WireGaugeCalc Free calculator · NEC cited · works offline
1.5 Hp 220v Motor Amps
1.5 hp 220v motor amps are quick with WireGaugeCalc, since the tool pulls the full-load current for the horsepower and voltage you enter.
It uses the NEC motor full-load current tables, not the nameplate guess, so your wire and overload sizing starts from the right number.
You see the amps in seconds, so the rest of the motor circuit math is straightforward.
Open the calculatorEnter any two values and read the rest.
Ohm’s law: V = I × R and P = V × I. Field aid only, verify against the current NEC and your local authority having jurisdiction.
How Motor Full-Load Amps Are Found
Motor branch circuits are sized from the table full-load current, since NEC 430.6 says to use that value rather than the nameplate amps.
A 1.5 hp single-phase motor at 230 volts draws about 10 amps from NEC Table 430.248.
What Affects The Motor Full-Load Current
The amps depend on a handful of motor inputs:
- Horsepower rating of 1.5 hp
- Supply voltage near 220 to 230 volts
- Single-phase versus three-phase, which changes the table used
- Roughly 10 amps for a single-phase 230 volt motor
- Conductors sized at 125 percent of full-load current per NEC 430.22
One app for every NEC calculation
WireGaugeCalc keeps the calculations you reach for most in one place:
- Voltage drop and wire sizing for any run
- Conduit fill for EMT, PVC, and RMC
- Box fill and junction box sizing
- Ampacity and temperature derating
- Motor circuit and load calculations
- Conduit bend offsets and saddles
Built for the field, works offline
The whole app runs on your phone, so it keeps working in a basement, an attic, or a job site with no signal.
There is no account to create and nothing to load. Open it, run the number, and get back to work.
- No signup and no signal needed
- Answers in a tap, not a spreadsheet
- Same tool on phone, tablet, and desktop
Every result cites the NEC article
Each answer shows the table or formula it came from, so you can check the method and learn the code as you go.
That makes the app useful on the job and during exam prep, since the reasoning is right next to the number.
Switch the code year your job runs on
Jurisdictions adopt the NEC at different times, so you can match the calculation to the code in force:
- NEC 2017, 2020, and 2023 tables
- Copper and aluminum conductors
- 60, 75, and 90 degree C terminations
- Single-phase and three-phase systems
Run the number, then get back to work
Stop flipping through a paper book or hopping between calculator sites. Enter your values, read the code-cited answer, and move on. Free to use, no signup.
Open the calculatorFrequently asked questions
How many amps does a 1.5 hp 220v single-phase motor draw?
NEC Table 430.248 lists about 10 amps for a 1.5 hp single-phase motor at 230 volts. Use the table value, not the nameplate, and verify against the current NEC and your local authority having jurisdiction.
What wire size do I use for the motor branch circuit?
Size the conductors for at least 125 percent of the full-load current, so a 10 amp motor needs conductors rated for about 12.5 amps before checking ampacity and termination temperature.
Is WireGaugeCalc free to use?
Yes. Every calculator is free to run with no signup. A paid tier adds saved projects, PDF reports, and extra code years, but the core math stays free.
Does it work without internet?
Yes. The app runs on your device, so it keeps working with no signal on a job site, in a basement, or in an attic.
Are the results code accurate?
Results follow published NEC tables and standard formulas, and each answer shows the article it came from. It is a field aid, not a stamp of approval, so verify against the current code and your local authority before you wire anything.
Which NEC code year does it use?
You can switch between NEC 2017, 2020, and 2023, since jurisdictions adopt the code at different times. Pick the year your job runs on.