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On September 1, 2016, DeWalt debuted its FlexVolt hybrid voltage battery pack that can switch between series battery wiring providing 60 V (54 V nominal) and 2 Ah, or parallel wiring for 20 V (18 V nominal) and 6 Ah, depending on whether it is installed in a 60 V or 20 V tool, determined by communication between the tool and battery.
Where no power need be transmitted, only digital data, the use of fiber optics can remove many ground loop problems, and sometimes safety problems too. Optical isolators or optocouplers are frequently used to provide ground loop isolation, and often safety isolation and can help prevent fault propagation.
Following an electrical injury from household current, if a person has no symptoms, no underlying heart problems, and is not pregnant further testing is not required. [9] Otherwise an electrocardiogram, blood work to check the heart, and urine testing for signs of muscle breakdown may be performed. [9]