Neutral-To-Earth Voltage and Ground Current Effects in Livestock Facilities

Problems of animal health and production attributed to voltages between the grounded-neutral system and true earth have risen sharply in rural areas. Animal production problems, particularly with dairy cows, have been observed at voltage levels of 0.75 to 1.0 V ac. A number of possible sources of excessive voltage have been identified from both on-farm and off-farm sources. The two principal voltage sources in non-faulty systems are discussed. The importance of impedance and current flow through various system components is demonstrated. Methods of mitigation related to the principal source are discussed. Safety considerations for farmstead neutral isolation are presented.