Motor Horsepower | Size Breaker | |
---|---|---|

1-1/2 | 230V 460V | 15 15 |

2 | 230V 460V | 15 15 |

3 | 230V 460V | 15 15 |

5 | 230V 460V | 15 15 |

## How many amps does a 3 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

HP | 1 Phase Amps | 3 Phase Amps |
---|---|---|

115 volt | 208 volt | |

3 | 34 | 10.6 |

5 | 56 | 16.7 |

7-1/2 | 80 | 24.2 |

## What size breaker do I need for a 4 hp motor?

How to Calculate How What Size Circuit Breaker a Machine will Need:

HorsePower of Main Motor | 220 Volts, 1 phase | 220 Volts, 3 phase |
---|---|---|

1 Hp | 5.6 Amps | 2.8 |

2 | 11.2 | 5.6 |

3 | 16.8 | 8.4 |

4 | 22.4 |
11.2 |

## How many amps does a 3 hp 480 volt motor draw?

AC Motor Full Load Amperes

HP | 200 Volts | 440-480 Volts |
---|---|---|

2 | 7.8 | 3.4 |

3 | 11 | 4.8 |

5 | 17.5 | 7.6 |

7.5 | 25.3 | 11 |

## How do I convert HP to amps?

**How to use the hp to amps calculator?**

- Estimate the power in watts (the nominator of the expression), 1 hp * 746 = 746 W ;
- Evaluate the product in the denominator, 200 V * 0.92 * 90% = 165.6 V . …
- Make a fraction of these numbers and find the final horsepower to amps value, 746 / 165.6 = 4.505 A .

## How many amps does a 5 HP 3 phase motor draw?

These are only intended to be guidelines and in all cases the full load amps of the motor nameplate should be used for final calculations.

…

Here are the Full Load Amp (FLA) values for typical 230VAC and 480VAC 3 phase motors.

Motor horsepower | Full load amps 230VAC | Full load amps 460VAC |
---|---|---|

3 | 9 | 4.5 |

5 | 15 |
7.5 |

7.5 |
22 |
11 |

10 | 27 | 14 |

## How do I choose a cable size for a motor?

Size of Cable for Branch circuit which has Single Motor connection is **125% of Motor Full Load Current Capacity**. Example: what is the minimum rating in amperes for Cables supplying 1 No of 5 hp, 415-volt, 3-phase motor at 0.8 Power Factor. Full-load currents for 5 hp = 7Amp. Min Capacity of Cable= (7X125%) =8.75 Amp.

## What size wire do I need for a 50 hp motor?

Electrical motor wiring data – NEMA amps, starter size, HMCP size for motors ranging 1/2 to 500 hp

Motor HP | NEMA amps | Phase Wires (AWG) |
---|---|---|

40 | 52 | 4 |

50 |
65 |
4 |

60 | 77 | 2 |

75 | 96 | 2 |

## What size breaker do I need for a 7.5 hp motor?

You need 50 amp rated wire with a **50-100 amp breaker**. 7.5hp=40 amps x 250%=100 amp breaker on #8 Thhn. If a 100amp breaker isn’t sufficient to start the motor without tripping I can then go up to a maximum of 400% of the motor rating.

## What size breaker do I need for a 5 hp motor?

A 5hp single phase AC motor has a load current of 28 Amps. So 10GA. wire with a **30 Amp breaker** will work.

## What size breaker do I need for a 15 hp motor?

Full Load Current: Three Phase AC Motors

Motor Horsepower | Size Breaker | |
---|---|---|

7-1/2 | 230V 460V | 40 30 |

10 | 230V 460V | 50 30 |

15 | 230V 460V | 70 40 |

20 | 230V 460V | 100 50 |

## What size breaker do I need for a 1.5 hp motor?

Assuming that it is single phase, a **15 ampere circuit breaker** should be adequate and will allow extra current for starting and surges.