The energy needed to damage most electronic devices is between nanojoules. Low relative humidity increases the charge buildup walking 20 feet (6 m) on vinyl floor at 15% relative humidity causes buildup of voltage up to 12 kV, while at 80% humidity the voltage is only 1.5 kV.Īs little as 0.2 millijoules may present an ignition hazard such low spark energy is often below the threshold of human visual and auditory perception. Maximal potential commonly achieved on human body range between 1 and 10 kV, though in optimal conditions as high as 20–25 kV can be reached. Potentials below 3000 volts are not typically detectable by humans. ![]() The maximal potential is limited to about 35–40 kV, due to corona discharge dissipating the charge at higher potentials. IEC 60065 states that consumer products cannot discharge more than 350 mJ into a person. IEC 479-2:1987 states that a discharge with energy greater than 5000 mJ is a direct serious risk to human health. during touching a charged car, creating a spark with energy of 500 millijoules.Īnother estimate is 100–300 pF and 20,000 volts, producing a maximum energy of 60 mJ. ![]() One experimenter estimates the capacitance of the human body as high as 400 picofarads, and a charge of 50,000 volts, discharged e.g. The energy in joules can be calculated from the capacitance (C) of the object and the static potential V in volts (V) by the formula E = ❜V2. The energy released in a static electricity discharge may vary over a wide range.
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