What Is a Switchboard?

Think of your switchboard as the control centre of your home's electrical system.

Electricity enters your property from the street and passes through the switchboard before being distributed to the various circuits throughout your home. These circuits supply power to lighting, power points, appliances, hot water systems, air conditioners, ovens, EV chargers etc.

In the switchboard at the origin of every circuit are protective devices which will disconnect that circuit if a fault is detected.

Without these protective devices, electrical faults could result in electric shock, damaged appliances, or overheating cables that can result in fire.

The Main Switch

The main switch is exactly what it sounds like: the device that allows power to the installation to be turned on or off.

If electrical work needs to be carried out or an emergency situation arises, the main switch can be used to disconnect power to the entire property.

Modern installations typically have clearly labelled main switches that are easy to identify and operate.

Circuit Breakers

Any electrical current flowing in a circuit causes cables to heat up. This is a normal consequence of the flow of electrical energy. 

Cables have specified current-carrying capacities (CCC), above which their ability to dissipate heat is insufficient to prevent overheating. The method of installation of the cable changes its ability to dissipate heat, and as such is factored in when the electrician installs the circuit protection.

For example, a cable installed completely surrounded by thermal insulation will have a lower CCC than a cable clipped to a timber joist.

If too many appliances are operating on a circuit or a fault causes excessive current to flow, the circuit breaker will automatically trip and disconnect the power.

Unlike old-style ceramic fuses, circuit breakers can be reset once the fault has been identified and rectified.

Circuit breakers protect the wiring in your home from overheating and reduces the risk of electrical fires.

Safety Switches (RCDs)

Safety switches, also known as Residual Current Devices (RCDs), constantly monitor the current flowing through a circuit. Under normal operation, the amount of current leaving and returning should be equal.

If electricity begins flowing somewhere it shouldn't—such as through a damaged appliance, faulty wiring or a person—the safety switch detects the imbalance and disconnects power extremely quickly.

This rapid disconnection is designed to prevent serious injury or death.

This is why safety switches are considered one of the most important electrical safety devices found in modern homes.

RCDs protect people from electric shock.

RCBOs: The Modern Standard

Most newer switchboards use devices called RCBOs.

An RCBO combines the functions of both a circuit breaker and a safety switch into a single device.

This means each circuit receives protection against:

• Overloads

• Short circuits

• Electric shock

One of the major advantages of RCBOs is that a fault on one circuit is less likely to affect other circuits throughout the home.

For example, a fault on a power point circuit may not cause the lights throughout the entire house to switch off. This means less disruption, and lower cost for an electrician to determine the fault.

Why Older Switchboards Can Be a Concern

Many older homes still contain switchboards that were installed decades ago.

These may contain:

• Rewireable ceramic fuses

• Limited or no safety switch protection

• Ageing electrical components that can be unreliable

• Insufficiently sized protective devices for the circuit cabling's current-carrying capacity - especially if thermal insulation has been installed

• Insufficient capacity for modern electrical loads

Today's homes often have air conditioning, induction cooktops, heat pumps, EV chargers, home offices and a growing number of electrical devices that older switchboards were never designed to accommodate.

An outdated switchboard may not provide the level of protection expected under modern electrical standards.

Signs You May Need a Switchboard Upgrade

Some common signs include:

Ceramic fuses instead of circuit breakers

Frequent tripping

Flickering lights

Overheating or discoloured components

Lack of safety switches

Renovations or major appliance upgrades

If you're unsure whether your switchboard is suitable for your home's current needs, an inspection by a licensed electrician can provide clarity.

The Bottom Line

Your switchboard is more than just a collection of switches and breakers. It is a critical safety system designed to protect your family, your property and your electrical installation.

Modern switchboards use advanced protection devices that can detect faults and disconnect power in fractions of a second, significantly reducing the risk of electric shock and electrical fires.

If your switchboard is older, lacks safety switch protection or struggles to keep up with modern electrical demands, it may be worth considering an assessment to determine whether an upgrade is appropriate.

Rose Electric Co can provide a free assessment by simply sending a photo of your switchboard to switchboards@roseelectric.com.au

or by contacting us via email, text or phone