from low voltage across loads. Interference with power line networking AFCIs may interfere with the operation of some power line communication technologies. References External links Underwriters Labs summary on UL 1699 standard on AFCIs The Electrical Safety Foundation International on AFCIs AFCI Educational Web site CPSC AFCI Fact Sheet AFCIs: Emerging Technology Solutions for Fires Resulting from Electrical Arcing from IAEI News: The Magazine EFCI / OFCI on Popular Science Arc Fault Testing and Arc Fault Scenarios, Underwriters Laboratory. Six types of AFCIs are listed. Electric power systems components Over-current protection devices Safety switches