Originally Posted By: Guest
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The fencer units didn't blow house fuses, but they were susceptible to lightning strikes given the fact the fence systems were grounded and there were literally miles of wire that could be hit. Those resistor blocks were there to protect the home from lightning strikes on the fence (or a lightning strike to a rod on the structure) damaging the wiring. Fences weren't the only reason they were installed but you're right that they were used in fencing systems.
Given the fact that this one's in the attic and the logical place for it if it were for fencing would be at or near the fence charger, I'd guess this one was in place to protect the house's electrical system from a direct hit.
Fence chargers require very little electricity, typically below .06 amps. I've never seen one that draws more than .5 amps. The energy is transformed and rectified from household voltages or from 12 volt DC sources and delivered to the fence at micro amp ratings in the 30,000 to 50,000 volt range.