At Keswick Electrical Services Ltd, we’re passionate about keeping homes and businesses across Bromley, Kent electrically safe. Electrical standards are constantly evolving as we learn more about how modern appliances interact with our electrical systems.
One of the biggest changes in recent years concerns Type AC RCDs. These devices were once the industry standard, but they are now considered outdated and potentially unsafe in modern electrical installations.
In this article, we’ll explain what an RCD is, why Type AC RCDs were originally installed, why they’re no longer compliant with modern standards, and how Keswick Electrical Services Ltd can help upgrade your system.
What Is an RCD and How Does It Keep Your Bromley, Kent Home Safe?
An RCD (Residual Current Device) is one of the most important safety components in your electrical installation.
Its job is simple but lifesaving.
An RCD constantly monitors the flow of electricity through a circuit. If it detects that electricity is “leaking” somewhere it shouldn’t be—such as through a damaged cable or even through a person—it switches the power off in milliseconds.
This rapid disconnection can:
- Prevent electric shocks
- Reduce the risk of electrical fires
- Protect people from potentially fatal electrical faults
In many cases, an RCD can trip in under 40 milliseconds, which is fast enough to dramatically reduce the danger of serious injury.
Why Type AC RCDs Were Originally Installed
For many years, Type AC RCDs were the standard device installed in consumer units across Bromley, Kent and the UK.
They were widely used because they were:
- Cost-effective
- Reliable for simple electrical systems
- Suitable for basic household appliances
Type AC RCDs were designed to detect pure alternating current (AC) leakage faults, which was perfectly adequate for the types of appliances commonly found in homes 20–30 years ago.
Back then, most equipment such as:
- Lighting circuits
- Kettles and toasters
- Basic heating systems
All produced simple electrical loads that Type AC RCDs could detect easily.
However, modern homes are very different.
The Problem with Type AC RCDs in Modern Bromley, Kent Homes
Today’s homes are filled with electronics and devices that generate different types of electrical current.
Many modern appliances can produce pulsating DC leakage currents, including:
- Washing machines
- Induction hobs
- Electric vehicle chargers
- LED lighting drivers
- Computers and televisions
- Heat pumps
- Modern boilers
The issue is that Type AC RCDs may not detect these types of faults properly.
In some cases, the presence of DC leakage can even prevent a Type AC RCD from operating correctly, meaning it may fail to trip when it should.
This obviously presents a serious safety risk to Bromley homes.
Why Type AC RCDs Are No Longer Compliant with Modern Standards
Due to these risks, the UK wiring regulations have changed.
The current regulations, BS 7671, no longer recommend the installation of Type AC RCDs in new installations.
Instead, modern consumer units typically use:
- Type A RCDs
- RCBOs (Residual Current Breaker with Overcurrent protection)
These devices are designed to detect both AC and pulsating DC leakage currents, making them far better suited for modern homes full of electronic equipment.
Because of this, many older consumer units containing Type AC RCDs are now considered outdated and non-compliant with current best practice.
How Keswick Electrical Services Ltd Can Help
If your Bromley property still has a Type AC RCD, it doesn’t necessarily mean your installation is immediately dangerous — but it does mean it may no longer provide the level of protection expected today.
That’s where Keswick Electrical Services Ltd comes in.
Our qualified electricians carry out:
Electrical Safety Inspections
We carry out Electrical Installation Condition Reports (EICRs) to identify outdated or non-compliant RCD protection.
RCD Testing and Diagnostics
We can professionally test your existing RCDs to ensure they operate correctly and provide the protection they’re designed for.
Consumer Unit Upgrades
If necessary, we can upgrade your consumer unit with modern protection such as Type A RCDs or RCBOs, bringing your installation in line with current standards.
Professional Installation
All work is completed safely, neatly, and in full compliance with UK electrical regulations.
Protect Your Home with Modern Electrical Safety
Electrical safety technology has improved dramatically over the past decade. While Type AC RCDs once did a great job protecting homes, they simply weren’t designed for the demands of today’s modern appliances.
Upgrading your electrical protection is one of the best investments you can make in the safety of your property.
If you’re in Bromley, Kent Keswick Electrical Services Ltd would be happy to help assess your installation and advise on the best solution.
✅ Need advice or an electrical inspection?
Contact Keswick Electrical Services Ltd today and let our friendly team help keep your home safe, compliant, and future-proof.
