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2215 IH 45

6612 Harborside Drive

3501 N. IH 35

League City, TX. 77573

Galveston, TX. 77554

Georgetown, TX. 78628

281-332-0511

409-744-7131

512-930-4000

Fax: 281-554-2592

Fax: 409-744-7131

Fax: 512-930-4002

Houston Fax 281-332-0513

Email: afence@afence.com

www.afence.com

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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