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Crabtree - Arc Fault Detection Devices

Arc Fault Detection Devices (AFDD) are a new addition to the 18th Edition of the IET Wiring Regulations.

Arc fault detection devices (when used) should be installed at the origin of each final circuit that is are being protected, AFDDS should be installed in consumer units and/ or distribution boards.

What’s an AFDD?

AFDDs work by protecting specifically against arc faults, as they automatically trip a circuit when they detect dangerous electric arcs – thus preventing the outbreak of a fire.

An arc fault occurs when the arc current either flows between active conducts in parallel with the load of the circuit or when it is flowing through the load(s).

Arcing is incredibly dangerous because it creates high intensity heating at the point of the arc, resulting in burning particles that may, over time, ignite surrounding materials. Moreover, repeated arcing creates carbon paths which generate temperatures exceeding 6,000 degC.

It can take time to develop but it can occur immediately or over a longer period, meaning that the onset of an electrical fire due to ignition of the cable insulation or nearby flammable materials is unpredictable.

AFDDs constantly monitor and analyse patterns in voltage waveforms and electrical current, looking out for divergence from normal patterns of waveform that denote a potentially dangerous arc.

They are designed and tested to not respond to arcing under normal operation of equipment, for examples vacuum cleaners and drills, whilst simultaneously continuing to respond to arc faults whilst the equipment is being used.

Electrical fires can be decreased in number by the use of this recognised device that installers can now easily access and install.

Electrium Sales Ltd - Crabtree
Commercial Centre
Lakeside Plaza, Walkmill Lane
Bridgtown, Cannock
WS11 0XE

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