Wiring Issues in 1970s and 1980s Sydney Homes: What Lies Behind the Drywall?

The Sydney housing development boom of the 1970s and 80s saw vast expansion of the suburbs, and while much of what was built was of a decent standard, it was “of its time”, which means adequate for the way people lived then. 

What all Sydney buildings of that period have in common is that they were built without the knowledge of how our electricity needs would increase. This can be seen most clearly in the number of outlets found in properties: back then, a single point per room might suffice, whereas today’s households require multiple outlets. If you’re wondering how much installing power points costs or considering a 15-amp power point installation for high-draw appliances, upgrading your capacity is often necessary.

In the kitchen or maybe a utility room you might find a washing machine and tumble dryer. But an EV charger? Even five years ago most of us had never heard of those. Most homes of the late 20th century were designed for much lower use than we see now.

Outdated & Hazardous Wiring Types

Electrical systems and components have come on in leaps and bounds in recent years, to the extent that when an electrician sees what is hidden in the walls and the electrical cupboards of older properties they are alarmed, appalled at the safety hazards that were considered acceptable back in the day. Understanding how often a home should be rewired can help spot potential hazards early.

This goes right down to the level of the colours of the wires. Before 2018 the active wire was red, neutral was black and earth was green and yellow or possibly just bare copper. Now active is brown, neutral is blue, and earth is green/yellow. Wiring colours were changed in Australia to align with global standards under the Australian Electrical Standards update, accommodating imported equipment used in homes and businesses.

Standards Australia, founded in the 1920s, has worked hard to keep abreast of changes, and continues to update legislation with the simple aim of making the country safer.

For their part, the better electrical contractors have ensured all their technicians are highly trained and qualified, and one thing they cannot tolerate is outdated and hazardous wiring types. 

Ceramic Fuse Boards & Missing RCD Protection

The ceramic fuse board, for instance, may once have been seen as safe, but those days are over. Knowing how to know if a fuse is blown is useful in an emergency, but older boards lack modern safety devices. Upgrading to a modern switchboard with trip switches provides far superior protection—consult our switchboard upgrade guide to understand the full assessment process.

RCD (Residual Current Device) protection is a life-saving safety feature that monitors electrical current and instantly cuts off the power if it detects a dangerous imbalance. Knowing how to test safety switches ensures your protection remains active, and taking action when a safety switch keeps tripping will help prevent fatal electric shocks and electrical fires.

Concealed Wall Hazards & DIY Modifications

Carrying out home improvements can be a dangerous business, and great care should be taken when ripping things apart, as there could be live electrical wires in there. Following a comprehensive renovation electrical checklist helps ensure work is planned safely.

DIY modifications in electrical systems are never a good idea and you should always call a professional rather than having a go yourself. Uncertified work often leads to warning signs that your electrical system needs urgent attention.

Remediation Strategy & Safety Inspections

Remediation means basically fixing something, and in electrical matters can be counterproductive and even dangerous, particularly when done by an amateur. A good professional like our team can assess the potential hazards and the possibility of success and install new materials rather than patching up old ones. Check our guide on how much rewiring a home costs to budget for complete cable replacements.

If you have plans for your electrical system, such as upgrading from single-phase vs 3-phase power, this is something you should not attempt yourself. If you are unhappy with your electrics – trip switches flicking off for no apparent reason, for instance – review our troubleshooting tips on why your power keeps tripping or contact a qualified electrician to perform a thorough safety inspection.