# What Size Circuit Breaker Do I Need Australia

What size circuit breaker do I need Australia? This is a common question for homeowners and DIYers alike. The answer to this question depends on a few factors, including the size of the circuit, the type of load, and the local electrical code.

In this article, we will discuss the factors that go into determining the correct size circuit breaker for your application. We will also provide a table of common circuit breaker sizes and their corresponding amp ratings.

## Factors to Consider When Choosing a Circuit Breaker

There are a few factors that you need to consider when choosing a circuit breaker. These factors include:

• The size of the circuit
• The local electrical code

### The size of the circuit

The size of the circuit is determined by the amount of current that the circuit can carry. This is measured in amps. The larger the circuit, the more current it can carry.

To determine the size of the circuit, you need to know the total wattage of the appliances and devices that will be connected to the circuit. Once you know the total wattage, you can divide that number by 120 to find the amps.

For example, if you have a circuit that will be used to power a 1,000-watt appliance, you will need a circuit breaker that is rated for at least 1,000 / 120 = 8 amps.

The type of load also plays a role in determining the size of the circuit breaker. Some loads, such as motors and air conditioners, can produce inrush currents that are much higher than the running current. This means that you need to choose a circuit breaker that is rated for the inrush current as well as the running current.

For example, a motor that has a running current of 10 amps and an inrush current of 20 amps will need a circuit breaker that is rated for at least 20 amps.

### The local electrical code

The local electrical code also specifies the minimum size of circuit breakers for certain types of circuits. For example, the National Electrical Code (NEC) requires that the main service disconnect be a 100-amp circuit breaker.

It is important to check the local electrical code to make sure that you are using the correct size circuit breaker.

## Table of Common Circuit Breaker Sizes

The following table lists the common circuit breaker sizes and their corresponding amp ratings.

Circuit Breaker Size Amp Rating
15 amps 15
20 amps 20
30 amps 30
40 amps 40
50 amps 50
60 amps 60
70 amps 70
80 amps 80
90 amps 90
100 amps 100

## How to Choose the Right Circuit Breaker

To choose the right circuit breaker, you need to consider the size of the circuit, the type of load, and the local electrical code.

Once you have considered these factors, you can use the table of common circuit breaker sizes to find the correct size breaker for your application.

## Conclusion

Choosing the right circuit breaker is important for safety and to

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