RCDs and RCBOs
RCD & RCBO Advice
Residual Current Devices (RCDs) and Residual Current Breaker with Overcurrent (RCBOs) are essential safety devices in modern electrical systems. They protect people and property from electric shocks and reduce the risk of electrical fires.
What is an RCD?
An RCD is a safety device that quickly cuts off electricity if it detects a fault or leakage current, stopping the voltage from going above 50 volts. In homes, most RCDs are rated at 30mA, which is sensitive enough to protect people from serious electric shocks.
RCDs do not protect against overcurrent (too much current from an overload), so they are usually paired with fuses or circuit breakers.
What is an RCBO?
An RCBO combines the functions of an RCD and a miniature circuit breaker (MCB). It protects against:
• Residual current (like an RCD)
• Overcurrent or short circuits (like an MCB)
RCBOs are installed per circuit, giving precise protection for individual sockets, lights and appliances.
Modern RCDs & Types
• Type A: Modern RCDs/RCBOs that can handle currents from new electronic equipment, LED lights, and variable speed appliances, All new consumer units come with Type A devices.
• Type AC: Older RCDs that may not trip with modern electronics; may need upgrading if you’re installing LEDs or electronic appliances.
Why You Need RCDs & RCBOs
• Enhanced safety: Reduce the risk of serious shocks and electrocution.
• Fire prevention: Detect faults before they can cause overheating or fires.
• Regulatory compliance: UK wiring regulations (18th Edition) require RCD protection on most new circuits, especially in kitchens, bathrooms, and outdoor areas.
Tips for Homeowners
• Ensure all new circuits are RCD or RCBO protected.
• Test RCDs every 3–6 months using the test button.
• Upgrade Type AC RCDs to Type A when doing electrical work.
• Always hire a qualified, Part P registered electrician for installation or upgrades.
Why Choose RW Currion For RCD/RCBO Installation?
• Fully qualified and insured
• Clear explanations — no jargon
• Work completed to the latest BS 7671 standards
• Safety-first approach to protect your home, family, and electronics
• All installations come with full certification and are emailed for your records.
Honest advice on any RCD/RCBOs required
Call now: 01295 533378
Mobile: 07740 100378