When I first got into boating, I didn’t realize how much difference there was between using electricity on a boat and using it at home. Even at the dock, it’s easy to forget that the amount of available electricity isn’t the same as it is ashore. After all, what’s one more electric heater, iPad, cell phone, computer, or sleep apnea machine? I also just learned that despite the fact that it says 30 amps on the power cord, a boat serviced with 30 amps should only expect to be able to use about 24 amps continuously (like with space heaters and water heaters.) Then there's unplugging from the shore power box. To prevent arcing and possibly lowering the capability of the cord even more, its important to turn off the breaker first, then unplug the shore power cord. This is something that is so often overlooked by many boaters.