**How does the joule relate to the Performance of an electric fence charger?**

It doesn't. It would take a ten page letter to explain all of the factors which make an electric
shock effective. The joule does not measure the effectiveness of electric shock. The joule is
a mathematical equation of Voltage x Amps x Time. The longer the" on-time" of the pulse,
the higher the joule rating will be and the longer the "on-time" the less safe the fencer is to
use and the less effective. The joule is not the correct way to measure the performance of any electric fence
charger because the joule does not consider peak current value or "on-time" which are key
factors in the effectiveness of a fencer, therefore, the joule cannot define true shock
effectiveness or fencers safety. What controls livestock is voltage and amperage. You must have voltage in order to force
electricity through the conductor (fence wire) as well as vegetation touching the fence, etc.,
and you must have current in order for the livestock to feel that shock. Joules or heat has
nothing to do with it. The most effective fence charger will have the highest power (voltage and amps) possible in
the shortest on-time possible, thereby allowing the fence charger to develop a sharp spike
which is far more effective in controlling livestock and at the same time is safe to use.
Example of how misleading the Joule rating is: The Parmak Pet Gard (model PG-50) is a
continuous current, non-pulsing type charger designed for small animals in
backyarcts, gardens, etc. Using the joule rating (Voltage x Amps x Time) the Pet Gard would have an
unlimited joule rating making it the most powerful fencer, which it is not.
In summary, it is important to point out that Underwriters Laboratories (U/L) or Canadian
Standard Assoc., (CSA) do not recognize the joule as a measurement when applied to

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