An AFDD is an Arc Fault Detection Device and it is designed to detect the presence of dangerous electrical arcs and disconnect the circuit affected.
What is arcing? An electrical arc is created when the electrical current jumps the gap between two conductive materials and if the current is comparatively low, a spark will be produced. If however the current is high enough a continuous electrical arc is generated where the air changes from a gas to a plasma capable of supporting the arc. The temperatures created by this arc can exceed 6000°C.
What is an Arc fault? An arc fault is where there is unintentional arcing in a circuit, as we’ve already mentioned the temperatures that can be generated by the arc can exceed 6000°C. This can create burning material at the point of the arc, which can then spread to the surroundings and ultimately into the dwelling.
If you have no AFDD’s fitted, there are a few warning signs to look out for ? Smell of burning coming from cables or socket outlets. Whilst there could be other causes other than an arc fault, the smell of burning coming from either cables or a piece of electrical equipment is not a good sign, similarly if the cable or equipment feels hot to the touch, turn off the circuit affected. If its fixed cabling or appliances contact a registered electrician and ask them to investigate. Scorch or burn marks on items of electrical equipment. Similar to the above, arcing may not be the primary cause of the scorch or burn marks, but again the affected circuit should be isolated and a registered electrician contacted. A rapid or intermittent ‘clicking’ noise accompanied by a burning smell coming from inside your consumer unit. If you encounter this situation, turn off the circuit affected and, contact a registered electrician.