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

Contents
Motor Horsepower Size Breaker
10 230V 460V 50 30
15 230V 460V 70 40
20 230V 460V 100 50
25 230V 460V 100 50

## How many amps does a 25 hp motor draw?

AMP DRAW BASED ON HORSEPOWER

HP 1 Phase Amps 3 Phase Amps
115 volt 208 volt
15 46.2
20 59.4
25 74.8

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

HP 200 Volts 208 Volts
20 62.1 59.4
25 78.2 74.8
30 92 88
40 120 114

## How do you size a circuit breaker for a motor?

You must size the conductors at 125% of the motor FLC [430.22(A)]. You must size the overloads no more than 115% to 125% of the motor nameplate current rating, depending on the conditions [430.32(A)(1)]. You must size the short-circuit ground-fault protection device from 150% to 300% of the motor FLC [Table 430.52].

## What size breaker do I need for a 21 amp motor?

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

HorsePower of Main Motor 220 Volts, 1 phase 440 Volts, 3 phase
10 56 14
15 84 21
20 112 28
25 140 35

## What size breaker do I need for a 20 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

## How many amps is a 5 hp motor?

A 5 HP motor at 230V, 3PH is12.

Using the formula above, multiply 12.4 amps by 10% for a result of 1.24. Add this total to 12.4 for a total of 13.64 amps.

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

You need 50 amp rated wire with a 50-100 amp breaker.

## How do I convert HP to amps?

Converting horsepower to amps can be done in a few simple steps, or using this simple formula.

1. Amps = (Horsepower × 746) ÷ Efficiency ÷ Volts.
2. Watts = Horsepower × 746.
3. Watts = Wattsη
4. Amps = Watts ÷ Volts.
5. Amps = HP × 746V × η × PF.

## How much current would a 1.5 HP 240v motor draw?

1 Horsepower is 745.7 watts, so a 1.5 HP motor would require a maximum of 1118.55 watts. 1118.55 W / 220V equals 5.084 amps, so in theory your motor will need just over 5 amps of current.

## What size breaker do I need for a 100 hp motor?

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

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Motor HP NEMA amps Motor Circuit Protector type HMCP (ampere)
60 77 150
75 96 150
100 125 200
125 156 250

## How do you measure a breaker for a 3 phase motor?

Breaker size must be rated for a minimum of 125% of the full-load current of the motor it is protecting, rounded up to the next standard breaker size. For example, the full-load current of a 5 HP motor at 460V is 7.6 Amps. The breaker must be sized for 7.6 * 1.25 = 10 Amps .

## What size wire do I need for a 1 hp motor?

Single Phase (230 Volt) – Wire Size Selection Guide*
HP Cable Length
1/2 14 14
3/4 14 14
1 14 12

## How many amps does a 10hp single phase motor draw?

Full-Load Current in Amperes Single-Phase Alternating Current Motors

HP 115V 230V
5 56 28
7-1/2 80 40
10 100 50
The voltages listed are rated motor voltages. The listed currents are for system voltage ranges of 110 to 120 and 220 to 240.

## How do I choose a motor wire size?

Calculate Size of Cable for Motor (As NEC)

1. Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity.
2. 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.
3. Min Capacity of Cable= (7X125%) =8.75 Amp.

1.08.2019
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