Do I Need an RCBO Consumer Unit in the UK?
If you are upgrading your fuse box, you may have been advised to install an RCBO consumer unit. But is it actually required — and what does it mean?
An RCBO consumer unit provides a higher level of individual circuit protection compared to older split-load boards.
If you are considering an upgrade, you can find more information about our Consumer Unit & Fuse Box Upgrade services in Altrincham.
What Is an RCBO?
RCBO stands for Residual Current Breaker with Overcurrent protection.
It combines two protective functions into one device:
- Overcurrent protection (like an MCB) – protects against overload and short circuit
- Residual current protection (like an RCD) – protects against electric shock
An RCBO protects each individual circuit separately.
How Is That Different from an RCD Consumer Unit?
Traditional split-load consumer units usually have:
- Multiple MCBs
- One or two shared RCDs
If a fault occurs on one circuit, the shared RCD may disconnect power to several circuits at once.
With RCBOs, only the affected circuit trips. The rest of the installation remains live.
Are RCBO Consumer Units Required by Law?
Current BS 7671 Wiring Regulations require appropriate RCD protection for most circuits in domestic properties.
While the regulations do not specifically state that RCBOs must be used, they do require effective fault protection and discrimination.
RCBO boards are often considered best practice because they:
- Improve fault isolation
- Reduce nuisance tripping
- Increase reliability
- Provide clearer fault identification
When Is an RCBO Consumer Unit Recommended?
An RCBO board is commonly recommended where:
- There is high reliance on continuous power (home office, business use)
- An EV charger is installed
- Sensitive equipment is present
- You want improved fault discrimination
For landlords and homeowners seeking long-term reliability, RCBO boards are increasingly the preferred option.
Is an RCBO Board More Expensive?
Yes, RCBO consumer units typically cost more than basic split-load boards because each circuit has its own combined protective device.
However, the improved protection and reduced inconvenience often justify the difference.
Will an RCBO Board Help with EICR Compliance?
While not mandatory in every scenario, an RCBO board often helps installations meet modern safety expectations and may reduce the likelihood of C2 observations relating to inadequate protection.
Older fuse boxes without RCD protection frequently fail EICR inspections.
Should You Upgrade to RCBO?
Whether you “need” an RCBO board depends on:
- The condition of your existing installation
- Your current consumer unit type
- Your electrical load and usage
- Future additions such as EV charging
A professional inspection is the safest way to determine the most appropriate upgrade.
Need Advice on Consumer Unit Upgrades?
If you are unsure which type of board is suitable for your property, we provide professional Consumer Unit & Fuse Box Upgrades in Altrincham with clear guidance and full certification.