The Evolution of Consumer Units

Estimated reading time: 5 minutes


From Fuse Boxes to Modern Standards

As a qualified electrician at MGB Electrical Solutions LtdFulham Electrician, I’ve worked with many consumer units over the years. Consumer units, previously known as fuse boxes, have advanced considerably to improve safety and efficiency in both homes and businesses. Here’s a look at how these crucial devices have developed, meeting the requirements of the 18th Edition Wiring Regulations.

The Early Days: Fuse Boxes

In the mid-20th century, homes relied on fuse boxes to protect circuits. These units used replaceable fuses that melted when overloaded, preventing electrical fires. However, replacing fuses manually was inconvenient and sometimes dangerous for untrained individuals.

Miniature Circuit Breakers (MCBs): A Major Leap

By the 1970s, Miniature Circuit Breakers (MCBs) replaced fuse boxes. Unlike fuses, MCBs provided automatic tripping and resetting, offering better protection and convenience. This shift was a crucial step toward safer, more efficient consumer units.

Miniature Circuit Breakers (MCBs): A Major Leap

The Introduction of Residual Current Devices (RCDs)

The 1980s marked the introduction of Residual Current Devices (RCDs). These devices detect earth faults and shut off power to prevent electrocution and electrical fires. RCDs added a vital layer of safety, especially in high-risk areas like bathrooms and outdoor circuits.

Dual RCD Boards and Split-Load Consumer Units

By the 1990s, dual RCD boards and split-load consumer units became standard. These innovations separated circuits across multiple RCDs, reducing nuisance tripping and ensuring that if one circuit experienced a fault, others remained functional.

18th Edition BS7671: Emphasising Safety

The 18th Edition of the BS7671 Wiring Regulations, introduced in 2018, further enhanced electrical safety. It required the use of Arc Fault Detection Devices (AFDDs) and expanded the application of RCDs. AFDDs protect against electrical fires caused by arc faults, while RCBOs (Residual Current Breaker with Overcurrent) combine overload and earth fault protection, enhancing safety for individual circuits.

18th Edition BS7671: Emphasising Safety

Recent Additions to Consumer Units

Surge Protection Devices (SPD)

To safeguard electrical installations from voltage surges caused by lightning or power fluctuations, Surge Protection Devices (SPDs) have become a critical component of modern consumer units. They prevent damage to electrical appliances and wiring, ensuring the longevity of your electrical system.

Type A RCD/RCBO

Type A RCDs/RCBOs detect both AC (Alternating Current) and pulsed DC (Direct Current) residual currents, making them ideal for modern homes where appliances like washing machines and chargers create varying electrical loads. This provides more comprehensive protection for today’s electrical systems.

Bi-Directional RCBOs

Bi-Directional RCBOs offer enhanced safety by providing protection from faults in both directions of the circuit. These are especially useful in circuits with multiple sources of power, such as solar panel installations or battery storage systems.


EICR Required Before Consumer Unit Replacement

Before considering a consumer unit replacement, it’s crucial to carry out an Electrical Installation Condition Report (EICR). An EICR identifies any issues that need addressing before a new consumer unit can be installed, ensuring that your electrical installation is safe and meets current regulations. If you’re in need of Fulham Consumer Unit Replacement or an EICR in Fulham, I’m happy to help.


For high-quality consumer units, Electrical4Less, your local Fulham electrical trade counter, offers a range of trusted brands. Here are some popular choices:

These brands offer reliable and efficient solutions, whether you need a standard unit or one with advanced protection features.


FAQs About Consumer Units and EICRs

1. What is a Consumer Unit?

A consumer unit, also known as a fuse box, distributes electricity to circuits in a property. It includes protective devices such as MCBs, RCDs, and RCBOs to safeguard the installation and prevent electrical hazards like fires and shocks.

2. What is an EICR, and why do I need one before replacing a Consumer Unit?

An Electrical Installation Condition Report (EICR) assesses the safety of an electrical system. Before replacing a consumer unit, an EICR is necessary to ensure that the wiring and existing components are safe and meet regulatory standards.

3. What is an SPD, and why is it important?

A Surge Protection Device (SPD) protects electrical systems from voltage spikes caused by lightning or electrical surges. It prevents damage to appliances and ensures the longevity of the installation by limiting excess voltage from passing through the system.

4. What is the difference between a Type A RCD and other RCDs?

A Type A RCD offers protection against both AC and pulsed DC currents. This makes it more suited to modern installations where appliances and devices generate pulsed DC, which traditional RCDs may not detect effectively.

5. What is a Bi-Directional RCBO?

A Bi-Directional RCBO protects circuits in both directions, providing safety in installations with multiple power sources, such as solar panels or backup batteries. It enhances the safety and functionality of the system.

6. How often should I get an EICR?

For most properties, an EICR should be conducted every 5 years or when there is a change of occupancy, especially in rental properties. For owner-occupied homes, it is recommended every 10 years, or when major electrical work is undertaken.


Why Choose MGB Electrical Solutions for Your Consumer Unit Installation?

At MGB Electrical Solutions Ltd – Fulham Electrician, I bring professional expertise as a NAPIT-registered and JIB Gold Card-certified electrician. My NVQ3 qualification and membership with Checkatrade ensure high standards in all installations, including Fulham Consumer Unit Replacements and EICRs in Fulham. Partnering with Electrical4Less, I use only high-quality components for all electrical works.

Need a Consumer Unit Upgrade or EICR?

If you need a consumer unit upgrade or an Electrical Installation Condition Report (EICR), get in touch with MGB Electrical Solutions Ltd – Fulham Electrician. I provide clear pricing, thorough inspections, and expert installations. Before any work, you’ll receive a detailed explanation of the process, timing, and any potential limitations.


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