RCD, RCCB & RCBO

This area is here for information purposes. Designers and installers should obtain their own copy of BS7671:2018 and follow the requirements and recommendations in the 18th Edition of the IET Wiring Regulations.  

Order your copy here. 

“For protection against electric shock”

What are RCDs?

RCDs is a generic term and it is commonly used to refer to devices such as RCCBs, RCBOs and other types of earth leakage detection operated protective devices.

What does the regulations say?

The use of RCDs particularly 30mA devices has been extended to include more applications and more types of installation in consecutive additions of the wiring regulations. For example 18th Edition requires all luminaire circuits in domestic household premises to be protected by 30mA RCD (411.3.4).

Consequently, greater emphasis is placed on protection against unwanted tripping of RCDs (see 531.3.2) and correct selection of the right type of RCD for each application. For example, in medical locations group 1 and 2, Type A or B are required.

How do I choose the right RCD?

The term RCD is used over 250 times in the 18th Edition of the Wiring Regulations.

To ensure that the correct type of RCD is selected the designer must match the operating characteristic of the RCD to the type of fault that can occur in the installation/equipment and manufacturer instructions should be consulted in the design and selection process.

What you need to know about RCDs and the 18th Edition

People talking about RCDs and the 18th Edition is, most of the time, a good thing, but occasionally it's a dangerous thing.

Discover more about RCDs and the 18th Edition in the piece below.

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