Consumer Unit Upgrades: When Should You Consider Replacing Your Fuse Box?
The consumer unit — often still referred to as the fuse box — is an important part of any electrical installation. It distributes electricity around the property and contains protective devices designed to operate when electrical faults occur.
But when should an older consumer unit actually be replaced?
It’s a question we are regularly asked, and the answer isn’t simply:
“It’s old, so it needs replacing.”
Older electrical equipment isn’t automatically unsafe simply because of its age. However, electrical installations and the standards applied to new work have developed considerably over the years, and there are circumstances where upgrading a consumer unit may provide important improvements to electrical safety and protection.
What Does a Consumer Unit Do?
The consumer unit is effectively the distribution point for the electrical circuits within a property.
Individual circuits — such as lighting, sockets, cookers and other equipment — are supplied through protective devices within the consumer unit.
Depending on the age and design of the installation, those devices could range from older rewireable fuses or circuit breakers through to modern RCD and RCBO protection.
Their purpose is not simply to provide electricity around the building. Appropriate protective devices are an important part of protecting the installation and its users when certain electrical faults occur.
Does an Old Fuse Box Automatically Need Replacing?
No.
This is an important distinction.
Seeing an older fuse box doesn’t automatically mean that an electrical installation is unsafe or that the consumer unit must immediately be replaced.
Its condition, the protective measures provided, the condition of the wider installation and how the installation is being used all need to be considered.
That’s one reason an Electrical Installation Condition Report (EICR) can be valuable. Inspection and testing allow the condition of the installation to be properly assessed rather than making assumptions based solely on appearance.
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From the Field: Old and New
These photographs show a good example of an older fuse box and the replacement consumer unit installed as part of an upgrade.
The difference is immediately noticeable, but the purpose of an upgrade isn’t simply to make the installation look newer.
Modern consumer units can incorporate protective devices and arrangements designed to meet the requirements applicable to today’s electrical installations.
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RCDs and RCBOs – What Do They Do?
Two terms you’re likely to hear when discussing modern consumer units are RCD and RCBO.
An RCD (Residual Current Device) is designed to disconnect the supply when it detects certain types of current imbalance, providing additional protection against electric shock in appropriate circumstances.
An RCBO combines residual-current protection with overcurrent protection for an individual circuit.
One advantage of individual RCBO protection is that a fault affecting one circuit need not necessarily disconnect several unrelated circuits through a shared RCD arrangement.
The appropriate design, however, depends upon the particular installation and its requirements.
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When Might a Consumer Unit Upgrade Be Considered?
There isn’t one answer that applies to every property.
An upgrade might be considered where an assessment identifies issues with the existing equipment or protective arrangements, when significant alterations are planned, or as part of wider improvements to an electrical installation.
Things an electrician may consider include the condition of the existing equipment, the type of protective devices installed, RCD protection, signs of deterioration or damage, the requirements of new work and the suitability of the existing arrangement for continued service.
The important point is that the decision should be based on a proper assessment of the installation, rather than simply the colour or age of the fuse box.
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Consumer Unit Upgrades Aren’t Just for Homes
Consumer units and distribution equipment are equally important within commercial and industrial premises.
These photographs show recent work involving three-phase distribution equipment in a commercial environment.
Commercial electrical installations can be considerably larger and more complex than a typical domestic installation, but the principle remains the same: electrical distribution equipment needs to be appropriate for the installation, properly maintained and capable of providing the required protection.
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What Happens During a Consumer Unit Replacement?
Replacing a consumer unit involves considerably more than removing one box and installing another.
The existing installation needs to be assessed, the replacement equipment must be appropriate for the installation, circuits need to be correctly connected and the completed work requires the appropriate inspection and testing.
Any issues discovered with the existing installation may also need to be addressed.
Once the work has been completed, the appropriate electrical certification should be provided.
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Pentacle Pro Tip
Don’t judge the safety of an electrical installation simply by how modern the consumer unit looks.
A new consumer unit doesn’t automatically mean that everything connected to it is in good condition, just as an older consumer unit isn’t automatically unsafe because of its age.
Inspection, testing and proper assessment are what establish the condition of an electrical installation.
That’s also why having an EICR carried out can be useful when the condition or history of an installation is unknown.
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Thinking About Upgrading Your Consumer Unit?
If you have an older fuse box, are planning alterations to your electrical installation or simply aren’t sure whether your existing consumer unit is suitable, Pentacle Electrical and Security Ltd can inspect the installation and advise on the appropriate next steps.
We provide electrical installation, inspection and testing services for homeowners, landlords and businesses in Welwyn Garden City and the surrounding Hertfordshire area.
Electrical | Fire | Security
Contact us to discuss your electrical requirements.