Extraneous dc voltage levels on South Carolina dairy farms

Buschermohle, M. J.; Bunn, J. M.; Spray, R. A.; Suddith, T. Q.

A survey of randomly selected farms was conducted. Voltage potentials were measured to an isolated earth and from point to point. The effects of barn age and soil type on the presence of various voltage levels were studied. Only 1.8% of the surveyed farms had one or more relevant measured potentials above 1.0 v dc. Measurements indicated that the milking claw may be a source of stray voltage.