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Frequently Asked Questions


Each edition of the regulations is designed to improve safety levels in electrical installations and accommodate new technologies and equipment specifications from emerging trends. For example, EV charging, Type A RCDs, Prosumers installations etc.

Highlights from Amendment 2 include:

- Mandatory use of Arc Fault Detection Devices for socket outlet circuits in certain residential premises

- Transient over-voltage protection must be fitted in all installations, exceptions may be permitted where the owner opts out and accepts all consequences and losses

- Extended use of RCBOs in residential premises to avoid unwanted tripping

- A new chapter for Prosumers (those who produce their own electricity and consume from the grid)

- Updates to Appendix 6 and Chapter 64 for certification and reporting

Designers, specifiers and installers need to see the full content of Amendment 2 to understand how the changes may affect their business. For example, Type AC RCDs now have limited permitted applications and should not be used on any circuit or equipment with any electronic components.

It may be necessary to review designs and specifications in order to ensure full compliance.

AFDDs are mandated for socket outlet circuits (up-to 32A rating) in high risk residential buildings, in homes in multiple occupation, in purpose built student accommodation, and in care homes. AFDDs are also recommended for socket outlet circuits (up-to 32A rating) in all other premises.

Electrium AFDDs are easy to install. They are all single module devices, same size as an MCB. They fit into regular consumer units. Take up only one way each, and do not require any special assembly processes or special enclosures. The installation process is the same as it is for an RCBO.

Installing & testing Electrium AFDDs is simple, the installation process is already familiar to installers because it’s the same process that installers have been using for RCBOs for decades. The device clips onto the DIN rail, it’s then connected to the busbar, the neutral lead is connected to the neutral bar, and the circuit cables are connected to the device. It’s as simple as that.

Testing of the device is also easy, when the device is first powered up it runs an automatic self-test function and will repeat its self-test function every 15 hours. The RCBO element is tested in the same was as any RCD / RCBO, by pressing the test button, or with an RCD tester.

There’s an added benefit too from the two pole switching mechanism, there’s no need to disconnect the circuit cables to carry out Insulation & Resistance testing during EICRs. Simply switch the device off and carry out your tests.

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