Hai Jiang

This paper describes the second phase of an experimental investigation into DC human body resistance conducted by the authors. 25 women and 27 men participated as test subjects for this work, each completing two iterations of a set of three measurements. These measurements evaluated the hand-to-feet and hand-to-hand current pathways under both dry and wet (simulated sweat) conditions. At each test condition at each test voltage the data were found to follow a log-normal distribution. Percentile results are calculated based on the fitted log-normal distribution and compared to the IEC 60479-1 body resistance data. It is found that the measured body resistance values in this work were higher than the IEC values, though this may be attributed to differences in the skin contact interface (conditions of which are not fully disclosed in IEC 60479-1). Female volunteers exhibited body current values on average 70-75% than the average values for male volunteers and are likely attributable to differences in average body mass rather than some gender-specific cause.

Biography:

Hai Jiang received his master and Ph.D. degree in electrical engineering from University of Dayton. He joined UL in 2011 and currently is a senior research engineer at UL. He is the Subject Matter Expert for Electrical Shock protection and the PDE for UL 101, “Leakage Current for Utilization Equipment”. He is US TAG member for IEC TC 64, and 108. He is a professional engineer (PE) and senior member of IEEE. He is a distinguished member of the William Henry Merrill Society.