Posted by JRSutton on April 24, 2014 at 07:40:32 from (71.174.108.245):
In Reply to: modern fence chargers posted by j hikemper on April 23, 2014 at 19:32:18:
The most common problem I've seen with electric fencing is the grounding rod spacing.
Generally in average soil you should use at least three 6 or 8 foot rods driven almost fully into the ground - More than 6 feet apart, 12 to 16 feet would be better.
Bunching the ground rods close together takes away the advantage of having more than one.
use a GOOD bonding connector to each, and a heavy copper wire to connect them all.
Then you can rule out bad ground for any future problems or issues (unless your soil gets bone dry - certainly not the case where I am).
Older high impedance chargers needed a good ground, but not as desperately as the newer (better) low impedance units do. So it's not really a question of old vs. new - but more of High vs. Low Impedance design.
The low impedance units use a lower voltage with higher current. Basically the same shock, but it'll power through shorts, like weeds touching the wire, etc.
Also - and maybe somebody will correct me on the physics here - but as far as I know, electricity mostly flows on the outer surface of wire. It's not surprising that surface rust would impeded your line more than you might expect. It'll still get through, but there will definitely be some resistance there.
But in the case you describe, I suspect most of the loss is probably due to poor splices at that point.
If only that section of wire is rusted, I'm going to guess that "new" section was pretty old when it was spliced in, and probably already had some good corrosion going on its surface, not allowing for a real clean bond between the old and new -whether it was twisted, crimped, or whatever. I doubt it was sanded down to clean metal.
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