Electric emissions from electrical appliances.
Electric emissions from electric appliances are frequently considered negligible, and standards consider electric appliances to comply without testing. By investigating 122 household devices of 63 different categories, it could be shown that emitted electric field levels do not justify general disregard. Electric reference values can be exceeded up to 11-fold. By numerical dosimetry with homogeneous human models, induced intracorporal electric current densities were determined and factors calculated to elevate reference levels to accounting for reduced induction efficiency of inhomogeneous fields. These factors were found not high enough to allow generally concluding on compliance with basic restrictions without testing. Electric appliances usually simultaneously emit both electric and magnetic fields exposing almost the same body region. Since the sum of induced current densities is limited, one field component reduces the available margin for the other. Therefore, superposition of electric current densities induced by either field would merit consideration.
Leitgeb
N
N
Institute of Clinical Engineering with European Notified Body of Medical Devices, Graz University of Technology, Inffeldgasse 18, Graz, Austria. norbert.leitgeb@tograz.at
Cech
R
R
Schröttner
J
J
D004574:Electromagnetic Fields; D004581:Electronics / Q000295:instrumentation*; D004781:Environmental Exposure / Q000032:analysis / Q000517:prevention & control* / Q000592:standards; D006794:Household Articles; D006801:Humans; D011834:Radiation Monitoring / Q000379:methods; D018570:Risk Assessment