Why were the electrical limits set as indicated?
These limits have caused considerable debate in the expert international community. The original limits were set more than thirty years ago. These limits have been subject to modification and improvement as the available body of knowledge has improved. The electrical output limits of impulse type energizers can now be related to the hazard associated with, say, the domestic 50 or 60 cycle power supply. In Europe, for example, the limit (C2 5% probability of ventricular fibrillation) for energizers has an equivalent hazard as that associated with the leakage current at 50 cycle to trip an earth leakage circuit breaker. Energiser normal and abnormal operation electrical limits are designed to take into account the normal population including ill health, age. It can be shown analytically, by the study of the electric current flows, that these limits ensure that electric fence energizers add very little extra hazard to the environment.
