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In the paper the results of experimental research on residual current protective devices with different design of the release system are presented. The application of a summing transformer and a power adjustment system in the secondary circuit affects the release frequency range. In the circuits of installations, where due to the specific features of the supplied devices, there are some current deformations...
The article contains an overview of the type testing carried out for face shields used in Live Workings to protect against the thermal effects of electric arc flash. The main part of the article describes a workstation established for helmet resistance testing with an integrated face shield protecting against the thermal impact of an electric arc.
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