You're having some electrical work done to your home or business and the the electrician is telling you they need to replace your existing RCD with a new one? Why? What's wrong with the perfectly fine one you already have installed in your fuse board?
In the UK, the wiring regulations now require all RCDs to be Type 'A' as opposed to the old 'AC' Type. So when carrying out any work on existing circuits or installing new circuits, Type 'A' RCDs must be installed to ensure advanced electrical safety.
Unlike Type AC RCDs, which primarily detect sinusoidal (AC) waveforms, Type A RCDs are designed to detect pulsating DC residual currents as well, offering broader protection against various electrical faults, such as those arising from electronic devices or renewable energy sources.
Given the increasing complexity and diversity of electrical systems such as DC current in car chargers, LED's lamps etc., Type A RCDs provide a more comprehensive safeguard against potential hazards, enhancing the resilience and reliability of electrical installations in compliance with modern safety regulations and standards.
Upgrading the RCD can be as simple as swapping out one unit for another or, if no existing RCD protection exists, installing a new consumer unit.
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