Consumer Mains Explained

Luke Herman
June 23, 2025

What You Need to Know About Consumer Mains for a Safe, Reliable Home

When it comes to electrical systems, there’s one part of the puzzle that often gets overlooked: consumer mains. Most people know what a switchboard does, or where their power points are, but the consumer mains? They quietly do some of the most important work behind the scenes. If you’re building, renovating, or just trying to understand your home’s power supply a bit better, this blog will walk you through exactly what consumer mains are, why they matter, and when you might need to upgrade them.

What Are Consumer Mains and What Do They Do?

Consumer mains are the main electrical cables that bring power from the network (usually the street or property boundary) into your home or business. From there, they connect directly to your switchboard, where the power gets distributed throughout the property.

You can think of them as the first link in your home’s private electrical chain. If the consumer mains aren’t working properly — whether they’re too small, damaged, or outdated — the entire electrical system can suffer.

Their job is simple but essential: safely carry electricity from the grid to your switchboard, so it can power everything else.

Reasons to Upgrade Your Consumer Mains

You don’t need to upgrade your consumer mains often, but when the time comes, it’s usually for one of these reasons:

New build or major renovation: Every new home needs consumer mains installed. Renovations that include new rooms, kitchens, or extra power-hungry appliances might also need a bigger supply cable to keep up.
Old or undersized cables: Older Perth homes often still have original mains, which were designed for much lower power use. Today’s homes are full of smart tech, air conditioning, EV chargers and more.
Safety concerns: Damaged or deteriorating cables pose serious fire and electrical hazards.
Switchboard upgrades: If you’re upgrading your switchboard or installing solar or battery systems, your mains may need an upgrade to support the new load.
Constant power issues: If your lights are flickering, breakers are tripping, or your system feels sluggish, it could be your mains holding everything back.

Types and Sizes of Consumer Mains

There’s no one-size-fits-all when it comes to consumer mains. The right type and size depends on your property, power demands, and local regulations. Here’s a quick rundown:

Copper vs Aluminium: Copper is more conductive and compact, but aluminium is lighter and more cost-effective. Both are compliant — it comes down to your setup.
Single-phase vs Three-phase: Standard homes often use single-phase power, while larger homes or properties with higher energy loads may need three-phase mains.
Size matters: Consumer mains are measured in mm² (square millimetres). Common sizes include 6mm², 10mm², 16mm², 25mm² or larger. Bigger cable = more capacity.

A licensed electrician will calculate the right size based on load requirements, cable length, and installation method (underground, overhead, or in conduit).

What Is a Consumer Mains Cable?

A consumer mains cable is the physical wiring that connects your property to the grid. It’s typically installed underground or inside protective conduit and is designed to handle the full load of electricity entering your home. The size, material, and installation method of the consumer mains cable all play a role in how efficiently and safely power flows through your electrical system.

If your consumer mains cable is undersized or aging, it could be restricting your ability to power modern appliances, charge electric vehicles, or add solar infrastructure. Upgrading to the correct cable isn’t just about meeting demand — it’s about protecting your home against future faults and potential fire risks.

Sub Mains vs Consumer Mains – What’s the Difference?

It’s easy to confuse sub mains and consumer mains, but they serve different purposes:

Consumer mains bring power from the network to your main switchboard.
Sub mains carry power from your main switchboard to another part of the property — like a detached shed, granny flat, or second switchboard inside the house.

Think of consumer mains as the highway from the grid, and sub mains as the driveways leading off it. Both are important, but consumer mains handle the initial load.

Dangers of Old or Damaged Consumer Mains

Outdated or faulty consumer mains aren’t just inefficient — they can be dangerous. Here’s why you should never ignore them:

Fire risk: Old or overloaded cables can overheat and spark.
Unreliable power: Lights flicker, appliances underperform, and circuits trip without warning.
Limited capacity: Want to install a pool, solar system, or EV charger? Your old mains might not cope.
Non-compliance: Modern safety standards have moved on. Old systems may not meet today’s legal requirements.

Getting your mains assessed can give you peace of mind — and protect your property from unnecessary risk.

When Do You Need to Upgrade Consumer Mains?

Not sure if it’s time for an upgrade? Here are a few signs it’s worth calling in an electrician:

You’re renovating or expanding your home.
Your switchboard is being replaced or upgraded.
You want to install solar, a battery system, or an EV charger.
Your lights flicker or power cuts out when you use multiple appliances.
You’ve been told your mains are too small for your current usage.

A quick inspection can confirm whether your existing consumer main is safe and sufficient — or whether an upgrade would make your whole system run better.

Professional Installation Makes All the Difference

Installing or upgrading consumer mains is not a DIY job. It involves high-voltage cables, strict safety requirements, and in many cases, formal notification to Western Power or other authorities.

At P Herman & Co, we handle the entire process:

Assessing your current system and power requirements
Recommending the right cable size and type
Installing your new consumer mains cable to the highest safety standard
Testing, certifying, and notifying the relevant authorities

We make it simple, safe, and completely compliant.

Need Help With Consumer Mains in Perth?

Whether you’re building, renovating, or upgrading your switchboard, our licensed electricians are here to help. With decades of experience across Perth homes and businesses, we’ll make sure your consumer mains are safe, modern, and ready for whatever the future holds.

Get in touch for friendly advice, transparent pricing, and high-quality service from a family-run team that puts safety first.