WireGaugeCalc Free calculator · NEC cited · works offline
70 Hp Fla
70 hp fla is fast with WireGaugeCalc, since you pick the motor horsepower and supply voltage and it returns the full-load amps from the NEC motor tables.
The calculator uses the table FLA value, not the nameplate amps, because motor branch-circuit sizing in NEC 430 is built on table values.
So you get the number you need to size conductors, the breaker, and the overload protection in one step.
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 The 70 Hp Motor FLA Is Found
The full-load amps depend on the voltage, so a 70 horsepower motor at 460V draws far less current than the same motor at 230V.
Conductors for a continuous motor load are sized at 125 percent of the table FLA per NEC 430.22, so the calculator shows that figure too.
Larger horsepower means larger conductors and a larger overload, so getting the FLA right early keeps the rest of the design honest.
What You Get For A 70 Horsepower Motor
Enter the horsepower and voltage and the result covers the key motor numbers:
- Table full-load amps from NEC 430.250 for a three-phase motor
- The 125 percent conductor sizing value for a continuous load
- Voltage options for 230V and 460V three-phase
- A starting point for the branch-circuit breaker rating
- The base FLA used for overload selection
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
Should I use nameplate amps or table FLA for a 70 hp motor?
Use the table full-load amps for conductor and breaker sizing per NEC 430.6(A). Use the nameplate amps only for the overload device. Always confirm the values against the current NEC and your local authority having jurisdiction.
What is the FLA of a 70 hp three-phase motor?
A 70 hp motor is not a listed entry in NEC 430.250, so most engineers round up to the 75 hp value, which is about 96 amps at 460V and 192 amps at 230V.
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.