This is my first time playing with the new E-Net, so maybe my concerns are irrelevant, but I thought I'd speak up anyway.
When I draw too much power in my house, it doesn't explode. Instead, a circuit breaker trips. Something that I need to manually reset. But even if that's a slight pain, it's good that things aren't blowing up around me. I suggest that IndustrialCraft gets the same thing. It could be done in two ways. The first is to have wires, be them unique, or 'upgrades', that automatically trip when too much energy flows through them, preventing damage to the blocks 'behind' them. The other is to have a circuit breaker upgrade that protects the machine it's built into.