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U.S. Department of Agriculture
(1991) |
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“Stray voltage is a small voltage (less than 10V) that can be measured between two
possible contact points. If these two points are contacted by an animal or person, a current
will flow. The amount of current depends on the voltage and the circuit impedance,
which includes the source, contact, and body impedances. Animals or persons respond
to the resulting current flow and not to the applied voltage. Thus, it is important
to determine the current level so that the expected response can be predicted
according to data generated by controlled scientific tests. The current can be
reliably estimated by measuring (at the time of contact) the voltage across the
contact points and dividing by the sum of the contact and body impedances, in
accordance with Ohm's law.” |
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