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Draft IEEE P-1695 Section 6 Contact Voltage

Draft IEEE P-1695 Section 6 Contact Voltage

Contact voltage is not a step and touch potential problem. The risk of contact voltage is not from the momentary voltage, but the presence of an underlying fault, which is at or near line voltage. Published data from a New York utility shows the voltage measured and recorded by the utility during investigation of confirmed shock reports range from 1-120V and higher, with many voltages below 5V. These measurements were taken by workers arriving at the scene hours or perhaps days following the shock incident. This suggests that voltages from high impedance faults do not remain constant over time, but are functions of environmental conditions such as temperature and moisture levels in the soil.