When a new air conditioner goes onto the wall, most homeowners understandably look at the new unit.
The part you cannot see can be just as important.
Before new electrical equipment is connected to an existing circuit, that circuit needs to be suitable, electrically safe and properly protected. Sometimes that testing uncovers problems that have been sitting unnoticed behind a cover, inside a connection point or back at the switchboard.
That was the important part of a recent Power Bolt Electrical job.
Alongside the air-conditioning work, the circuit was tested and the protection was upgraded to a safety switch. As the photos from the job show, once electrical connections are opened and inspected, signs of heat damage and deterioration can sometimes become very obvious.
It is a good reminder that an electrical circuit can appear to be working normally while a problem is developing where nobody can see it.
“It Still Works” Doesn’t Mean the Circuit Is Healthy
Electrical faults are not always dramatic.
A circuit does not necessarily stop working the moment something begins to deteriorate.
Loose or damaged connections, deteriorating insulation, earthing faults and other problems can develop over time while appliances continue operating.
In some cases, the first visible warning may be:
- discolouration around a connection
- melted or damaged plastic
- a burning smell
- intermittent operation
- nuisance tripping
- unusual heat around electrical equipment.
In other cases, there may be no obvious warning to the homeowner at all.
That is why electrical testing matters.
Queensland’s Electrical Safety Office specifically identifies testing as a way of detecting and locating electrical faults, measuring equipment performance and verifying that electrical work is safe before equipment is connected or reconnected to supply.
What Can Cause a Connection to Overheat?
There are several possible causes of heat damage around an electrical connection, and the actual cause needs to be established by testing rather than guessed from appearance alone.
Possible causes can include a poor or loose termination, damaged equipment, deterioration over time or excessive resistance at a connection.
Once resistance increases at a connection point, heat can build while current is flowing.
Over time, that heat can damage insulation, terminals and surrounding components.
This is one reason electrical work isn’t simply about whether something switches on when the job is finished.
The circuit and its protection need to be checked as well.
Why Upgrade the Circuit to a Safety Switch?
A safety switch, also called an RCD, performs a different job from an ordinary circuit breaker.
A circuit breaker is primarily there to protect wiring and electrical equipment against excessive current.
A safety switch monitors current flowing through the circuit and can rapidly disconnect the electricity when it detects current leaking to earth, helping protect people from serious electric shock.
Queensland’s Electrical Safety Office recommends considering safety-switch protection across all household circuits, including air conditioning, lighting, ovens, hot water and pool equipment, rather than assuming that every circuit in an older switchboard is already protected.
That distinction matters in older homes.
Opening a switchboard and seeing a row of switches does not necessarily mean every one of those circuits has safety-switch protection.
One easy visual clue is the test button found on a safety switch, although identifying exactly which circuits are protected is best left to proper testing.
Sometimes the Upgrade Reveals the Problem
There is another important reason Power Bolt tests circuits during this type of work.
Adding modern safety-switch protection can sometimes expose an existing electrical fault.
An older circuit may have operated for years without an RCD detecting leakage to earth because there wasn’t one protecting that circuit.
Once appropriate RCD protection is installed and the circuit is properly tested, an underlying fault may become apparent.
That can be inconvenient if additional work is required, but it is far better to discover the problem during controlled testing than after somebody receives an electric shock or a damaged connection deteriorates further.
Queensland’s current guidance for low-voltage electrical testing includes earth continuity, insulation resistance, polarity and RCD/RCBO testing as part of verifying an installation.
Air Conditioning Places Real Demand on Electrical Circuits
Air conditioners are substantial fixed electrical loads.
During a Queensland summer, a system may operate for hours at a time, particularly during extended periods of hot weather.
That makes the condition of the supply circuit particularly important.
Installing a modern inverter air conditioner onto an ageing or questionable electrical circuit without checking what is behind it misses half the job.
The new air conditioner might be perfectly good.
The electrical installation supplying it still needs to be good too.
This Is Why Power Bolt Tests Before Walking Away
For Power Bolt Electrical, an air-conditioning installation isn’t simply:
Remove old unit → install new unit → turn it on.
The electrical side matters.
The existing circuit needs to be checked, appropriate circuit protection needs to be in place and the completed electrical work needs to be tested.
Sometimes everything checks out.
Sometimes testing uncovers something that needs attention.
And occasionally, what looks like a routine upgrade reveals a potentially dangerous fault that has been sitting out of sight.
That’s exactly why the testing is done.
When Was Your Switchboard Last Checked?
If you live in an older home, have recently added major appliances, are replacing an old air conditioner or aren’t sure which circuits in your home have safety-switch protection, it may be worth having the installation checked.
You should never open a switchboard or attempt to investigate damaged wiring yourself. Electrical testing and repair work must be carried out by an appropriately licensed electrical worker.
Power Bolt Electrical can test existing circuits, upgrade safety-switch protection and identify electrical faults before they become a bigger problem.
Sometimes the most valuable part of an electrical job is finding the problem you didn’t know was there.
Frequently Asked Questions
Why should an electrical circuit be tested when installing an air conditioner?
Testing helps confirm that the existing circuit is electrically safe, suitable for the equipment being connected and properly protected. It can also identify hidden faults that may not be obvious during normal use.
Can an electrical circuit still work even if it has a dangerous fault?
Yes. Some electrical faults can develop gradually while the circuit or appliance continues to operate. Loose connections, damaged insulation, excessive resistance and earth leakage may not immediately stop equipment from working, which is why electrical testing is important.
What is the difference between a safety switch and a circuit breaker?
A circuit breaker primarily protects wiring and equipment against excessive current, while a safety switch or RCD monitors for current leaking to earth and can rapidly disconnect the electricity to help protect people from electric shock.
Should air conditioning circuits have safety switch protection?
Safety switch protection is an important part of modern electrical safety. Existing homes may contain circuits that do not have the same level of RCD protection as newer installations, so an electrician can test the switchboard and determine whether an upgrade is required.
What can cause an electrical connection to overheat?
Possible causes include loose or deteriorated connections, damaged components, poor terminations and excessive electrical resistance. The exact cause should be determined through inspection and electrical testing by a licensed electrician.
Can installing a safety switch reveal an existing electrical fault?
Yes. When an older circuit is tested or upgraded with RCD protection, existing earth leakage or another fault may become apparent. Discovering the issue during controlled testing allows it to be investigated and repaired before it becomes a more serious safety problem.