I just set up Minecraft 1.3.2 with Industrial Craft 1.106 and started a new world.
List of mods:
Forge Mod Loader 3.0.196.366
Minecraft Forge 4.1.1.251
IndustrialCraft 2 1.106
Nuclear Control 1.3.2 Addon
Setup my first machine and solar panels to power them. I noticed that when I break the wires with my pickaxe, the machines are still drawing power from the batbox. If I had a bare copper wire, which causes electricity damage when I get near it, then break that wire, there will still be electricity damage in that same spot. If I restart the game, this behavior is corrected.
WorkAround: Restart the game anytime you make a wiring change.