Individual circuit protection
An RCBO protects each final circuit independently, improving discrimination and limiting disruption when a fault occurs.
Residential electrical • London
Residential Fuse Box & Consumer Unit Upgrade
Replacement of an older plastic consumer unit with a modern 18th Edition metal consumer unit using individual RCBO protection across the final circuits.
Project outcomes01 02 03 04
Safer circuit protection with less disruption.
Improved resilience
A fault or nuisance trip is less likely to disconnect a whole group of unrelated circuits.
Metal enclosure
The modern metal consumer unit provides the enclosure standard expected for current residential installations.
Tested and certified
The completed work was inspected, tested, labelled and documented as part of the upgrade.
The existing installation
Why the board was upgraded.
The existing plastic consumer unit relied on shared RCD protection across groups of circuits.
A fault on one circuit could disconnect several otherwise healthy circuits, causing avoidable disruption.
The older board offered less effective circuit separation than a modern all-RCBO arrangement.
The installation required careful circuit identification, disconnection, testing and retermination.
The solution
Careful replacement and testing.
The existing consumer unit was safely isolated, labelled and removed.
Each circuit was identified and prepared before installation of the new metal enclosure.
The replacement board was fitted with individual RCBO protection and surge protection.
Circuits were terminated, labelled, inspected and electrically tested before the installation was returned to service.
Before
The existing plastic Hager consumer unit before work commenced. 
The original board opened to identify the circuits and existing terminations.
Before the upgrade.
The existing plastic consumer unit and original shared-RCD arrangement.
During
The outgoing circuits were identified, labelled and safely disconnected. 
The old enclosure was removed and the mounting area prepared. 
The new 18th Edition metal enclosure and main protective devices were positioned. 
Individual circuits were reterminated into the new RCBO arrangement.
During the upgrade.
Isolation, circuit identification, removal, installation and retermination.
After
The completed board with individual RCBOs, surge protection and labelled circuit terminals. The completed metal consumer unit, closed and ready for service. 
The installation was labelled with its inspection information and recommended next inspection date.
After the upgrade.
The completed metal consumer unit with individual RCBO protection, surge protection, labelling and inspection information.
Related services
Planning a fuse box or consumer unit upgrade?
Cordy can inspect the existing installation, explain the available protection options and provide a clear quotation.
Discuss your property
Request a quotation.
Send photographs of the existing fuse box together with the property address and any known faults.
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