**Contents**show

## How do you calculate the cable size of an HP motor?

Cable size calculation formula:

The cable size is equal to the 1.5 times of the full load current of the motor/load. Hence the cable rating formula can be written as, Cable size = 1.5 x Full Load Current.

## How do I calculate motor cable size?

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 breaker do I need for a 40 hp motor?

Full-Load Current and Circuit Protection Data for Three-Phase AC Motors

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

20 | 230 V 460 V | 100 50 |

25 | 230 V 460 V | 100 50 |

30 | 230 V 460 V | 125 70 |

40 | 230 V 460 V | 175 100 |

## What size wiring do I need?

The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right one to go with. For a 40 amp you need a 8-gauge wire. For a 20 amp, you will need a 12-gauge wire.

## How many amps does a 40 hp motor draw at 480 volts?

AC Motor Full Load Amperes

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

40 | 120 | 52 |

50 | 150 | 65 |

60 | 177 | 77 |

75 | 221 | 96 |

## How much load can a 2.5 mm cable take?

Choosing the correct size cable

Conductor Size | Current | Maximum power (Watts) |
---|---|---|

1.25 mm^{2} |
13 amps | Up to 3120 Watts |

1.5 mm^{2} |
15 amps | Up to 3600 Watts |

2.5 mm^{2} |
20 amps | Up to 4800 Watts |

4.0 mm^{2} |
25 amps | Up to 6000 Watts |

## How do I choose a cable size per load?

Selection of Cable

- Cable derating amp should be higher than full load current of load.
- Cable voltage drop should be less than defined voltage drop.
- No. of cable runs ≥ (Full load current / Cable derating current).
- Cable short circuit capacity should be higher than system short circuit capacity at that point.

## What size breaker do I need for a 25 hp motor?

Full Load Current: Three Phase AC Motors

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

10 | 230V 460V | 50 30 |

15 | 230V 460V | 70 40 |

20 | 230V 460V | 100 50 |

25 | 230V 460V | 100 50 |

## What size wire do you need for a 30 amp breaker?

For a maximum of 30 amps, you’ll need a wire gauge of 10. The most common household item that requires a 30 amp circuit is a central air conditioner.

## How many amps does a 20 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

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

115 volt | 208 volt | |

10 | 100 | 30.8 |

15 | — | 46.2 |

20 | — | 59.4 |

## How far can you run 10 gauge wire for 30 amps?

How far can 10 gauge wire carry 30 amps? 30 amps carried over a 10 gauge wire is not meant to be run over far distances. If you plan on going over 150 feet, you should upgrade the wire size from 10 gauge to 8 gauge.

## Can I mix 12 and 14 gauge wire?

Can you mix 12 gauge and 14 gauge wire? – Quora. If we are speaking of the US the answer is yes however, even if the supply is 12AWG, the breaker must be replaced with a 15 Amp breaker becuase the 14 awg wire is the smaller load carrying conductor.

## Should I use 12 or 14 gauge wire?

As long as you don’t put too many lights on the light circuit, you can usually control that circuit with a 15-amp breaker, as well as wire it with a 14-gauge wire. … On the other hand, an outlet circuit controlled by a 20-amp breaker requires a 12-gauge wire.