6EATON CORPORATION BR003010ENSevere weather with lightning and rolling thunder makes people uneasy for a good reason – it is dangerous. If these electrical charges come into contact with combusti- ble materials, they can cause fires and severe damage.However, it is not just large lightning that can cause considerable damage. Small light-ning too, so-called arc faults, which can occur within electrical installations, exhibit enormous damage potential.WHERESuch micro-lightning can occur in any cable or wire, be it in fixed installations and in cables of directly connected devices or devices connected via sockets. WHENThey occur when there are faults or damage to the wires, caused by external influen-ces or ageing. However, a loose terminal connection or careless handling of electrical devices can also be the cause. Such faults and damages can be immediate, or they can occur over longer periods of time of months or even years, creating an undetected fire hazard.WHYWhat type of defect can lead to such micro-lightning and what are the most frequent causes of arc faults?• Crushed wires• Damage to wire insulations caused by nails, screws, deterioration etc.• Ageing of installation• Broken cables or discontinuities in a wire • UV rays and rodent bites• Loose contacts and connections• Bent plugs and wiresSerial and parallel arc faultsProtection against micro-lightningEven small arc faults, micro-lightning, can ultimately lead to large fires and devastating damage.Lightning can cause severe damage.
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